JPH10135953A - Multiplex message communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To guarantee a serial number order and to improve the reliability of transmission by performing delivery after performing, keeping in a temporary keeping queue when it is not an order to be delivered next in the case of performing the reception processing of a multiplex message and delivering it to a transmission destination program in the order of the serial number. SOLUTION: When a multiplex message transmission request has been originated from the program 11 of a transmission origin, the transmission part 14 of a processor 10 retrieves an address table 17, obtains the address of the processor 30 and prepares a message. The message is transmitted from communication adapters 20 and 21, through communication media 1 and 2 and the communication adapters 40 and 41 to the reception part 35 of the processor 30. The processor 30 receives the multiplex message, performs the reception processing by using a serial number management table 38 and a time-out processing part 36 and delivers it to a program 32 of a transmission destination in the order o the arrival. In this case, when the serial number of the received massage is not in the order to be delivered next, the received message is kept in the temporary keeping queue 39 and then 15 delivered to the program 32 of the transmission destination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex message communication method in a distributed processing system including a plurality of processing devices such as computers, and more particularly to a method of duplicating data and adding the same serial number to a plurality of messages. The present invention relates to a technique which is effective when applied to a multiple message communication method for performing transmission and reception while guaranteeing the sequence number of multiple messages.

[0002]

2. Description of the Related Art A multiplexing network control technique for multiplexing transmission paths has been known as a technique for improving the reliability of message transmission between processing devices in a distributed processing system. Has been put to practical use.

[0003] The high reliability of message transmission by the multiplexing network means that even if a failure occurs in a certain transmission network, message transmission can be performed using a normal transmission network, or a message can be transmitted during transmission on a certain transmission network. Even if the message is lost, by using the multiplexed message via another transmission network, the destination processing unit can conceal the loss of the multiplexed message and enable the destination processing unit to process normally. Point.

That is, in order to increase the reliability of message transmission by a multiplexing network, a multiplexed message transmitted by a transmission source processor is transmitted not only in a steady state but also in the event of a failure without loss of serial numbers and in order of serial numbers. It needs to be delivered to the destination program.

[0005] The network multiplexing system generally known as the dual system is a system suitable for applications requiring real-time message transmission with high reliability without delay even when a failure occurs.

However, in the dual system, since messages are always transmitted and received in both multiplexed transmission networks, the steady load on the transmission processing device and the reception processing device generally increases.

[0007] Therefore, the processing performed by the transmission source and transmission destination processing devices must have as small a steady load as possible.

[0008] Further, since the destination processing device needs a large number of reception buffers to receive multiplexed messages from a plurality of transmission networks, it is necessary to reduce the size of the buffer provided in the destination processing device.

In the dual system, the following method is known as a method that requires a small steady-state load and requires a small buffer capacity.

[0010] That is, when the serial number of the multiplex message added by the transmission source processing device is used for detecting the multiplex message (the same serial number is added to the multiplex message), the transmission destination processing device transmits the latest multiplex message received in the past. The serial number (current reception serial number) is always stored, and if the serial number of the received message is larger than the current reception serial number, it is determined to be a multiplex message that has not been received in the past, and is taken in. If the current reception serial number is equal to or smaller than the current reception serial number, it is determined that the multiplex message is the same as the multiplex message received in the past and discarded.

FIG. 18 is a diagram showing a timing chart of a transmission process of a multiplex message in the duplex LAN configuration system of the conventional multiplex message communication method.

As shown in FIG. 18, in the transmission processing of the multiplex message in the conventional dual LAN configuration system of the multiplex message communication method, two transmission networks (LAN1, LAN2) are used.
The figure shows an example of a dual-system multiplex message transmission / reception process between two processing devices connected by, where the transmission source processing device assigns a serial number to each transmission message and sends it to LAN1 and LAN2, and the transmission destination processing device A state is shown in which multiplexed messages are received from both LANs, and fetched multiplexed messages are controlled by comparing the current reception serial number with the serial number of the multiplexed message.

The receiving logic of the transmission destination processing device is as follows.

Assuming that the current reception serial number managed by the transmission destination processing device is Sc and the serial number assigned to the reception message is Sm, if Sm> Sc, the reception message is fetched and passed to the transmission destination program, and Sc is converted to Sc. substitute.

If Sm ≦ Sc, the received message is discarded.

Such a logic has a simple calculation process, so that the overhead of detecting a multiplex message is small. In addition to the case where the transmission network is duplicated, the multiplicity such as triple and quadruple is used. There is an advantage that this logic can be used as it is even if the number is increased.

In the above-described conventional multiplex message reception processing in the dual system, when transmission times between a plurality of multiplexed transmission networks are different, there is a possibility that multiplex messages cannot be passed in number order.

That is, in the above-described conventional multiplex message receiving process, if a multiplex message is lost in one of the transmission networks, processing is performed in the same way as a multiplex message is lost in both of the transmission networks. There is a possibility that a missing serial number may occur in the multiplex message passed to.

FIG. 19 is a diagram showing a timing chart of a missing serial number of a received message in a duplex LAN configuration system of a conventional multiple message communication method.

As shown in FIG. 19, when a serial number of a received message is lost in the duplex LAN configuration system of the conventional multiple message communication method, the multiple messages are transmitted using the conventional technique in the duplex LAN configuration system. In this case, the transmission process of the multiplex message when the serial number missing occurs in the multiplex message received by the transmission destination program.

The multiplex message of serial number "2" is lost in a specific transmission network (for example, LAN1), and before the multiplex message of serial number "2" arrives via the other transmission network (LAN2), the next serial number is transmitted from LAN1. When the multiplex message having the serial number "3" arrives, the above-described problem occurs.

That is, in the transmission destination processing device, the multiplex message of the serial number "1" and the serial number "3" is passed to the transmission destination program, but the multiplex message of the serial number "2" arriving after this is discarded as it is. The advantage of multiplexing the transmission network is lost.

On the other hand, a method in which a processing executing side which executes processing according to an input message detects an input multiplexed message, selects one of the multiplexed messages, and executes its own processing is disclosed in Japanese Patent Application Laid-Open No. Sho 63/1988. No. 30956.

Here, by adding an identifier called an event number to the multiplex message, the destination processor can detect the multiplex message, collect the multiplex messages by the destination, and select one multiplex message selected from the multiplex messages. It executes its own process only once using only the message, thereby preventing the same process from being performed multiple times.

[0025]

The present inventor has found the following problems as a result of studying the above prior art.

That is, in the above-described conventional dual-system multiplex message receiving process, when the transmission time between a plurality of multiplexed transmission networks is different, the multiplex message lost in a specific transmission network is transmitted to the other transmission network. If the next multiplex message of the next serial number arrives from the specific transmission network before arriving via the network, the lost multiplex message will have a smaller serial number than the current reception serial number. There is a problem that the advantage of multiplexing the transmission network is lost and the merit of the transmission network is lost.

That is, in the conventional multiplex message receiving process described above, if a multiplex message is lost in one of the transmission networks, the result is processed in the same way as a multiplex message is lost in both of the transmission networks. There is a possibility that a missing serial number may occur in the multiplex message passed to.

As a method of preventing the missing of the serial number, a method of storing all the missing serial numbers and passing the multiplexed message of the serial number to the destination program when it arrives can be considered. Problems.

(1) The data cannot be passed to the destination program in the order of serial numbers.

(2) It is unknown how long or how many missing serial numbers should be stored, and a large storage area is required.

On the other hand, Japanese Patent Application Laid-Open No.
In the technique disclosed in JP-A-30956, one multiplex message is delivered to a destination program when a set of multiplex messages is completed or when a first-arrived one arrives. The above problem cannot be solved even if this technique is used.

An object of the present invention is to provide a technique capable of guaranteeing the sequence number of a multiplex message and making the message transmission highly reliable.

Another object of the present invention is to provide a technique capable of performing highly reliable message transmission in a duplex network.

[0034] Another object of the present invention is to provide a technique capable of improving the reliability of message transmission in a multiplexed network including two or more transmission networks.

Another object of the present invention is to provide a technique capable of performing highly reliable message transmission on a single transmission network.

[0036] Another object of the present invention is to provide a technique capable of improving the reliability of message transmission in a transmission network via a relay processing device.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0038]

SUMMARY OF THE INVENTION Among the inventions disclosed by the present application, the outline of a representative one will be briefly described.
It is as follows.

(1) In a multiplex message communication method for transmitting and receiving a multiplex message between a plurality of processing devices connected by a transmission network, if the received message is not a multiplex message to be passed to the next destination program, the received message is temporarily The multiplex message is stored in a storage queue, and after waiting for the next multiplex message to be passed, is passed to the transmission destination program, thereby improving the reliability of the multiplex message reception process.

In the multiplex message communication method, when a multiplex message is received from the transmission network, it is checked whether the received message is a multiplex message to be passed to the next destination program.

If the received message is a multiplex message to be passed to the destination program next, the received message is passed to the destination program.

As a result of checking whether the received message is a multiplex message to be passed to the next destination program,
If the received message is not the next multiplex message to be passed to the destination program, the received message is stored in a temporary storage queue, and the multiplex message to be next passed to the destination program arrives via another transmission network. Wait for.

Next, when the multiplex message to be passed to the destination program arrives via another transmission network, the received message is passed to the destination program, and the multiplex message stored in the temporary storage queue is checked. If multiple messages having the serial number next to the serial number of the received message are stored, the multiple messages are sequentially passed to the destination program.

Next, if the multiplexed message to be passed to the destination program is not received as a result of waiting for the multiplexed message to arrive via another transmission network, the multiplexed messages stored in the temporary storage queue are sequentially read. Pass it to the destination program.

Next, it is determined whether or not the multiplex message to be passed to the transmission destination program is received. The time elapsed since the received message was stored in the temporary storage queue, the number of multiplex messages stored in the temporary storage queue, or ,
This is performed based on the serial number value of the multiplex message arriving via another transmission network.

That is, when the maximum storage time has elapsed since the received message was stored, when the number of multiplexed messages stored in the temporary storage queue reached the maximum number that can be stored, or when the number of multiplexed messages stored in the temporary storage queue reached the upper limit. If the serial number of the multiplex message that has arrived is greater than the serial number of the multiplex message to be passed to the next destination program, the reception of the next multiplex message to be passed is abandoned, and the stored multiplex message is replaced with the destination program. Pass to.

In the multiplex message communication method, in the transmission of multiplex messages between a plurality of processing devices, even if a failure occurs in a certain transmission network, message transmission can be performed using a normal transmission network, Even if a message is lost during transmission by using a multiplexed message via another transmission network, the destination processor can conceal the loss of the multiplexed message as a result and keep the serial number without dropping. It can be delivered to the destination program in order.

Further, in the above multiple message communication method,
The criterion for giving up the reception of the multiplexed message with the missing serial number is also clear, so that the queue capacity for temporarily storing the multiplexed message can be reduced.

As described above, according to the multiplex message communication method, when the serial number of the received message is not the serial number to be passed to the next destination program, the received message is stored in the temporary storage queue and then passed to the destination program. Therefore, it is possible to guarantee the order of the serial number of the multiplex message and to make the message transmission highly reliable.

(2) In the multiplex message communication method described in the above (1), the reliability of the multiplex message reception process is improved by using two pieces of serial number information of a provisional serial number and a reception current serial number on a duplex network. Is what you do.

In the multiplex message communication method, the maximum serial number of a received message received by two transmission networks is set as a provisional serial number, the maximum serial number of a multiplex message passed to a destination program is set as a reception current serial number, The multiplex message receiving process is made highly reliable using the two serial numbers.

First, if the provisional reception serial number is equal to the reception current serial number and the reception message serial number is equal to the next serial number after the reception current serial number, the reception message is passed to the transmission destination program as a multiplex message to be passed next. The multiplex message having the serial number next to the serial number of the received message in the temporary storage queue is sequentially passed to the transmission destination program.

When the provisional reception serial number and the reception current serial number are equal and the serial number of the received message is larger than the serial number next to the reception current serial number, the received message is stored in the temporary storage queue as not a multiplex message to be passed next. .

If the provisional reception serial number is larger than the reception current serial number and the serial number of the received message is equal to the serial number next to the reception current serial number, the reception message is passed to the transmission destination program as a multiplex message to be passed next, and is temporarily stored. Multiplexed messages having a serial number next to the serial number of the received message in the queue are sequentially passed to the destination program.

If the provisional reception serial number is greater than the reception current serial number and the reception message serial number is greater than the reception current serial number, and if the reception message serial number is less than the reception provisional serial number, the next multiplex to be passed Assuming that the message has not been received, the multiplex message having the serial number or less of the received message in the temporary storage queue is passed to the transmission destination program.

When the provisional reception serial number is larger than the reception current serial number and the reception message serial number is higher than the next serial number after the reception current serial number, the reception message serial number is higher than the reception provisional serial number, and the transmission network that transmitted the reception message is If it is equal to the transmission network that transmitted the multiplexed message of the provisional serial number, the received message is stored in the temporary storage queue as a multiplexed message that is not to be passed next.

When the provisional reception serial number is larger than the reception current serial number and the reception message serial number is higher than the reception current serial number, the reception message serial number is larger than the reception provisional serial number, and the transmission network that transmitted the reception message is If the transmission network is different from the transmission network that transmitted the multiplex message of the provisional serial number, the multiplex message to be passed next is not received, and the multiplex message having the reception provisional serial number or less in the temporary storage queue is passed to the transmission destination program.

As a result, if the serial number of the received message is the serial number next to the current serial number, the received message is passed to the transmission destination program.

If the serial number of the received message is equal to or smaller than the current serial number, the received message is discarded because it is a multiplex message that has already been passed to the destination program.

In the multiplex message communication method, the multiplex message is detected and the serial number control of the fetching process is performed using the provisional reception serial number and the reception current serial number. Upon reception, it is possible to immediately determine whether the received message is a multiplex message to be passed to the next destination program, a multiplex message to be temporarily stored, or a multiplex message to be discarded. As a result, the overhead of the receiving process can be reduced.

As described above, according to the multiplex message communication method, a multiplex message is received by using two pieces of serial number information, ie, a provisional serial number and a current number.
It is possible to increase the reliability of message transmission in a multiplexed network.

(3) In the multiplex message communication method described in the above (1), a high multiplex message receiving process is performed using a multiplex network reception serial number on a multiplex network including two or more transmission networks. This is to increase the reliability.

In the multiplex message communication method, the larger one of the maximum value of the serial number of a received message of a specific transmission network among a plurality of transmission networks and the maximum value of the serial number of a multiplex message passed to a destination program is used. The multiplexed network reception serial number of the transmission network is used, and the multiplexed message reception process is highly reliable using the multiplexed network reception serial number.

First, the multiplexed network reception serial number of the transmission network that transmitted the received message is equal to or less than the minimum value of the other multiplexed network reception serial numbers, and the received message serial number is the next serial number to the multiplexed network reception serial number. In some cases, the received message is passed to the destination program as the next multiplex message to be passed, and the multiplex messages in the temporary storage queue having the serial number next to the passed multiplex message are sequentially passed to the destination program.

If the multiplexed network reception serial number is smaller than the minimum value of the other multiplexed network reception serial numbers and the serial number of the received message is larger than the next serial number of the multiplexed network reception serial number, it should be passed next. The multiple messages in the temporary storage queue are sequentially passed to the destination program assuming that the multiple messages are not received.

If the multiplexed network reception serial number is equal to the minimum value of the other multiplexed network reception serial numbers and the serial number of the received message is larger than the next serial number of the multiplexed network reception serial number, the multiplex to be passed next Store the received message in a temporary storage queue as not a message.

When the multiplexed network reception serial number is larger than the minimum value of the other multiplexed network reception serial numbers, the received message is stored in the temporary storage queue as not being the next multiplex message to be passed.

In the multiplex message communication method, two or more paths are provided as multiplex message transmission paths between processing apparatuses, for example, when a transmission network between a plurality of processing apparatuses is duplexed or multiplexed. In that case, the message transmission can be made highly reliable.

As described above, according to the multiplex message communication method, multiplex messages are received using multiplex network reception serial numbers corresponding to the respective transmission networks. It is possible to increase the reliability of message transmission in a computerized network.

(4) In the multiple message communication method described in the above (1) to (3), the process of receiving a multiple message multiplexed on a single transmission network is made highly reliable.

In the multiplex message communication method, a multiplex message identifier for identifying a plurality of multiplex messages created by duplicating the same data and adding the same serial number is added to the message format.

When a multiplex message is transmitted through a single transmission network, a plurality of multiplex messages to which the same data, the same serial number, and different multiplex message identifiers are added are transmitted over a single transmission network.

The destination processing device that has received a plurality of multiplexed messages on the single transmission network treats the multiplexed messages having the different multiplexed message identifiers as being transmitted on different transmission networks, so that the The reception processing is performed on the assumption that the multiplex message is being transmitted on a plurality of transmission networks.

In the multiplex message communication method, a transmission network between a plurality of processing devices is not multiplexed,
Even when only one path is provided as a transmission path of the multiplex message between the processing devices, the message transmission can be made highly reliable.

As described above, according to the multiplex message communication method, a multiplex message having a multiplex message identifier for identifying a plurality of multiplex messages created by duplicating the same data and adding the same serial number is received. It is possible to improve the reliability of message transmission in a single transmission network.

(5) In the multiplex message communication method described in the above (1) to (4), the process of receiving a multiplex message transmitted via a relay processing device is made highly reliable.

In the multiplex message communication method, when a multiplex message is relayed via a relay processing device, a transmission source processing device is added from the multiplex message received by the relay processing device to identify the multiplex message. When the identifier is read and transmitted to the relay destination processing device, the read identifier added by the transmission source processing device is added to the multiplexed message to be transmitted and transmitted to the transmission destination processing device.

The destination processing device that has received the multiplexed message relayed via the relay processing device can treat the received multiplexed message as if it had been sent directly from the source processing device. When a multiplexed message is received from the transmission network, whether the received message is a multiplexed message to be passed to the next destination program, a multiplexed message to be temporarily stored, or a multiplexed message to be discarded , Etc., can be processed.

As described above, according to the multiplex message communication method, the relay processing is performed by adding the identifier added by the transmission source processing device to the multiplex message to be transmitted to identify the multiplex message. It is possible to increase the reliability of message transmission in a transmission network via a device.

[0080]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Hereinafter, in the multiplex message communication method of the present invention, a process of receiving a multiplex message on a duplicated transmission network, selecting a first message from among the multiplex messages, and passing the selected message to a destination program. An implementation device that implements the multiple message communication method of the first embodiment will be described.

FIG. 1 is a diagram showing a schematic configuration of an apparatus for implementing the multiplex message communication method of the present embodiment. In FIG. 1, 1 and 2 are networks, 10, 30, 5
Numerals 0 and 70 are processing units.

As shown in FIG. 1, an apparatus for implementing the multiplex message communication method of this embodiment has networks 1 and 2 and processing apparatuses 10, 30, 50 and 70.

Further, as shown in FIG. 1, in the apparatus for implementing the multiplex message communication method of this embodiment, the processing apparatuses 10, 30, 50 and 7 are connected to both the networks 1 and 2.
0 is connected to perform communication between the processing devices via the networks 1 and 2.

The networks 1 and 2 are FDDI (Fib
All communication lines such as computer lines, telephone lines, wireless (wireless), and satellite lines can be used.

In FIG. 1, a bus type network 1
And 2 are shown, but various networks 1 and 2 of a loop type or the like can be used.

As the processing devices 10, 30, 50 and 70, any computer such as a workstation, a personal computer, a controller, a mainframe computer, and a portable computer can be used. It may be a calculator.

Next, the format of the multiplex message transmitted via the networks 1 and 2 between the processing units 10, 30, 50 and 70 of the apparatus for implementing the multiplex message communication method of this embodiment will be described with reference to FIG. This will be described with reference to FIG.

FIG. 2 is a diagram showing an example of a format of a multiplex message of an implementation apparatus that implements the multiplex message communication method of the present embodiment. In FIG. 2, reference numeral 101 denotes a DA unit,
102 is the DP section, 103 is the SA section, 104 is the SN section, 105 is
This is the DATA section.

As shown in FIG. 2, the format of the multiplex message of the implementing apparatus for implementing the multiplex message communication method of the present embodiment is as follows: DA section 101, DP section 102, SA section 10
3, an SN unit 104, and a DATA unit 105.

As shown in FIG. 2, in the format of the multiplex message of the apparatus for implementing the multiplex message communication method of the present embodiment, the DA section 101, the DP section 102, the SA section 103, the SN section 104, and the DATA section 105, address information (destination processing device address) of the destination processing device, information specifying the destination program (destination program identifier), processing device identifier of the source processing device (source processing device identifier), It stores the serial number of the multiplex message sent from the source processing device to the destination processing device and user data to be passed to the destination program.

The multiplex message includes, for example, a control code for error detection, in addition to the above information, but is omitted because it has no direct relation to the apparatus that implements the multiplex message communication method of the present embodiment. I have.

Next, referring to FIG. 3, the processing device 10 of the execution device for executing the multiplex message communication method of the present embodiment will be described.
The configuration of 30, 50 and 70 will be described.

FIG. 3 is a diagram showing a schematic configuration of the processing device 10 of the embodiment which implements the multiplex message communication method of the present embodiment. In FIG. 3, 11 is a transmission source program,
12 is a destination program, 13 is a communication unit, 14 is a transmission unit, 15 is a reception unit, 16 is a timeout processing unit, 17 is an address table, 18 is a serial number management table, 19 is a temporary storage queue, and 20 and 21 are communication adapters. It is.

As shown in FIG. 3, the processing apparatus 10 of the implementing apparatus for implementing the multiplex message communication method of the present embodiment includes a transmission source program 11, a transmission destination program 12, a communication unit 13, a transmission unit 14, Receiving unit 15, timeout processing unit 16, address table 17, serial number management table 18, temporary storage queue 19, communication adapter 20
And 21.

Further, as shown in FIG. 3, the processing apparatus 10 of the implementation apparatus for implementing the multiplex message communication method of the present embodiment.
Then, the multiplex message of the transmission source program 11 is transmitted to the networks 1 and 2 via the communication unit 13 and the communication adapters 20 and 21, and the multiplex message on the networks 1 and 2 is transmitted to the communication adapters 20 and 21 and the communication unit 13.
The processing devices 30, 50, and 70 have the same configuration.

The transmission source program 11 and the transmission destination program 12 are, for example, a user program or an application program created or used by a user.
For example, information is transmitted to 0 or the like, and information transmitted from another processing device 30 or the like is received via the communication unit 13.

The communication unit 13 transmits a multiplex message via the communication adapters 20 and 21 in response to a multiplex message transmission request requested from the transmission source program 11,
The multiplex message received from the networks 1 and 2 is transferred to the destination program 12.

The communication adapters 20 and 21 exchange multiplexed messages between the networks 1 and 2 and the processing device 10, and it is assumed that only one transmission network can be connected to a single communication adapter.

Therefore, in the apparatus for implementing the multiplex message communication method of this embodiment, since the two networks 1 and 2 are connected to each processing apparatus, the processing apparatus 10 has at least two communication adapters 20 and 21. It is assumed that

In the apparatus for implementing the multiplex message communication method according to the present embodiment, it is assumed that the communication unit 13 can identify each of the communication adapters 20 and 21 with a communication adapter identifier for identifying each communication adapter.

As the communication adapter identifier, for example, the network numbers and broadcast addresses of the communication adapters 20 and 21 on the networks 1 and 2 or an ID assigned to the communication adapter can be used.

In the apparatus for implementing the multiple message communication method according to the present embodiment, the communication adapters 20 and 21 are provided.
Has a function of receiving only a multiplex message addressed to its own processing device address registered in advance.
And 21 have different processing device addresses registered.

Note that the number of transmission networks that can be connected to each communication adapter is not limited to one, and this case will be described at the end of the description of the apparatus for implementing the multiplex message communication method of this embodiment.

Next, the internal configuration and processing of the communication unit 13 of the embodiment which implements the multiplex message communication method of the present embodiment will be described in detail.

The communication unit 13 includes an address table 17 for managing the address of the destination processing device of the multiplex message,
A serial number management table 18 for managing serial numbers of transmitted and received multiplexed messages, a temporary storage queue 19 for temporarily storing received messages, a transmitting unit 14 for performing multiplexed message transmission processing, and a receiving unit for performing multiplexed message reception processing 1
5 and a timeout processing unit 16 for managing the storage time of the multiplex message temporarily stored in the temporary storage queue 19.

Next, the address table 17 of the device that implements the multiplex message communication method of the present embodiment will be described.

The address table 17 is a table for managing the address of the multiplex message transmission destination processing device.

FIG. 4 is a diagram showing an example of the configuration of the address table 17 of an apparatus for implementing the multiplex message communication method of the present embodiment. 4, reference numeral 111 denotes a program identifier, 112 denotes a processing device identifier, 113 denotes a communication adapter identifier, and 114 denotes a destination address.

As shown in FIG. 4, the address table 1 of the implementing apparatus that implements the multiplex message communication method of the present embodiment.
7 has a program identifier unit 111, a processing device identifier unit 112, a communication adapter identifier unit 113, and a destination address unit 114.

As shown in FIG. 4, in the address table 17 of the device that implements the multiplex message communication method of this embodiment, the program identifier 111, the processing device identifier 112, the communication adapter identifier 113, and the destination The address program 114 contains the destination program 12
, The identifier of the destination processing apparatus, the identifier of each communication adapter that passes the multiplex message to be transmitted, and the address of the destination processing apparatus.

For example, in the program identifier section 111,
A thread, process, or procedure name is stored as an identifier of the destination program 12, and an ID number for identifying the destination processing device is stored in the processing device identifier unit 112 as an identifier of the destination processing device.

Further, for example, the communication adapter identifier 11
3 stores a MAC address or the like as an identifier of each communication adapter, and the destination address section 114 stores an IP address or the like as an address of a destination processing device.

The contents of the same line of the program identifier section 111, the processing apparatus identifier section 112, the communication adapter identifier section 113, and the destination address section 114 are treated as corresponding information, and are treated as one set.

Now, since the networks 1 and 2 are multiplexed transmission networks, the above-mentioned pair is 2 for one kind of combination of the program identifier and the processor identifier.
In this case, two destination addresses exist for each destination program 12.

Next, a description will be given of the serial number management table 18 of the apparatus for implementing the multiple message communication method of the present embodiment.

The serial number management table 18 is a table for managing the serial number of the multiplexed message transmitted to the destination processor and the serial number of the multiplexed message received from the source processor.

FIG. 5 is a diagram showing an example of the configuration of the serial number management table 18 of the embodiment which implements the multiplex message communication method of the present embodiment. In FIG. 5, reference numeral 121 denotes a processing device identifier, 122 denotes a transmission serial number, 123 denotes a provisional reception serial number, and 124 denotes a reception current serial number.

As shown in FIG. 5, the serial number management table 1 of the implementing apparatus for implementing the multiple message communication method of the present embodiment.
8 is a processing device identifier section 121 and a transmission serial number section 122
, Reception provisional serial number section 123, reception current serial number section 12
And 4.

Further, as shown in FIG. 5, in the serial number management table 18 of the apparatus that implements the multiplex message communication method of the present embodiment, the processing apparatus identifier section 121 stores the multiplex message transmission destination processing apparatus or transmission source processing. The processing device identifier of the device is stored.

[0120] The transmission serial number section 122 stores a transmission serial number attached to a transmission message to the destination processing apparatus corresponding to the processing apparatus identifier section 121. This serial number stores one user data in the transmission destination processing apparatus. It is counted up each time it is transmitted.

However, in the apparatus for implementing the multiplex message communication method of the present embodiment, the networks 1 and 2 which are transmission networks in which one user data is multiplexed.
, The same user data is transmitted as a transmission message, so that the two multiplexed messages have the same serial number.

The provisional reception serial number 123 stores a provisional reception serial number. The provisional reception serial number is a serial number managed by the transmission destination processing apparatus for each transmission source processing apparatus, and is a serial number of the received multiplex message. Indicates the maximum value.

The reception current serial number section 124 stores the reception current serial number. The reception current serial number is a serial number managed by the transmission destination processing device for each transmission source processing device, like the provisional reception serial number. Of the multiple messages
This is the maximum value of the serial number of the multiplex message actually passed to the destination program 12.

In the apparatus for implementing the multiplex message communication method according to the present embodiment, the destination processing apparatus detects the multiplex message and performs the sequence control process using the two provisional reception serial numbers and the current reception serial numbers that have been introduced. .

The details of the serial number change processing, the multiplex message detection processing, and the sequence control processing will be described when the processing of the receiving unit 15 is described.

Next, the transmitting unit 14 of the apparatus for implementing the multiplex message communication method of the present embodiment will be described.

The transmission section 14 receives a multiplex message transmission request from the transmission source program 11, creates a multiplex message according to the message format, and requests the communication adapters 20 and 21 to transmit.

In the apparatus for carrying out the multiplex message communication method according to the present embodiment, the networks 1 and 2 which transmit in response to one transmission request from the transmission source program 11 are provided.
One multiplex message is created for each network, that is, a total of two multiplex messages are sent to the communication adapters 20 and 21 corresponding to the networks 1 and 2, respectively.

Upon receiving the multiplex message transmission request from the transmission source program 11, the transmission unit 14 firstly checks the transmission destination processing device identifier and the communication adapter from the address table 17 based on the program identifier of the transmission destination program 12 passed at this time. A set of the identifier and the address of the destination processing device is acquired.

At this time, in the apparatus for implementing the multiplex message communication method of this embodiment, there are two networks 1 and 2 connected to the destination processing apparatus, and correspondingly, the communication adapters 20 and 21 also have two networks. Therefore, two sets of the destination processor ID, the communication adapter identifier, and the address of the destination processor are acquired in response to one multiplex message transmission request from the source program 11.

However, since the transmission destination processing device and the transmission destination program 12 are the same, the two acquired sets are:
The destination processing device identifier and the destination program identifier are the same.

Next, based on the acquired processing device identifier, the transmission sequence number corresponding to this processing device identifier is incremented from the sequence number management table 18 to obtain the incremented value.

Since only one type of processing device identifier is obtained, only one transmission serial number is obtained.

Next, two multiplex messages to be transmitted to each of the networks 1 and 2 are created in total according to the message format.

The DA unit 101 stores the obtained address of each destination processing device, the DP unit 102 stores the destination program identifier, and the SA unit 103 stores the processing device identifier of the source processing device. In the SN unit 104, the acquired transmission serial number is stored, and in the DATA unit 105, the user data passed from the transmission source program 11 is stored.

Then, the created two multiplexed messages are passed to the corresponding communication adapters 20 and 21, respectively, and the processing of the transmission unit 14 is completed.

After that, the communication adapters 20 and 21 to which the multiplex message has been passed perform a process of sending the multiplex message to the networks 1 and 2.

Next, a description will be given of the receiving unit 15 that performs the receiving process of the multiplex message of the implementing apparatus that performs the multiplex message communication method of the present embodiment.

The receiving unit 15 of the apparatus for implementing the multiplex message communication method of the present embodiment receives multiplex messages from the duplexed networks 1 and 2 via the communication adapters 20 and 21, respectively. Select the first-come-first-served one, guarantee the sequence of the serial number, and
Perform the process to pass to.

Further, the receiving unit 15 does not wait for two multiplexed messages having the same serial number to arrive, but when the first of the multiplexed messages arrives, the receiving unit 15 transmits the first multiplexed message to the destination program 12. To avoid lowering the communication throughput.

In addition, the receiving unit 15 considers the missing reception serial number due to the loss of the multiplex message on the networks 1 and 2, and even when the missing serial number occurs in one of the transmission networks,
The process of passing the first-come, first-served multiplex message while guaranteeing the order of the serial numbers to be passed to the transmission destination program 12 is performed.

In order to perform such processing, the receiving unit 15 uses two serial numbers, a provisional serial number and a reception current serial number.

In the following, in the apparatus for implementing the multiplex message communication method according to the present embodiment, the process of receiving the multiplex message by the receiving unit 15 will be described with reference to the PAD (Pr
This will be described in detail with reference to an oblem analysis diagram).

FIG. 6 to FIG. 8 are diagrams showing the processing contents of the receiving unit 15 of the apparatus for implementing the multiplex message communication method of the present embodiment.

As shown in FIGS. 6 to 8, the receiving unit 15 of the apparatus for implementing the multiplex message communication method of the present embodiment performs a multiplex message receiving process.
The provisional reception serial number is denoted by St, the reception current serial number is denoted by Sc, the serial number assigned to the received message is denoted by Sm, and the initial values of St and Sc in the destination processing device are both “0”.

The serial number given to the first multiplex message stored in the temporary storage queue 19 is denoted by Smq.

When the receiving unit 15 of the apparatus for implementing the multiplex message communication method of the present embodiment receives a multiplex message from one of the transmission networks, for example, the network 1, via the communication adapter 20, the processing starts. If the provisional reception serial number St is equal to the reception current serial number Sc (St = Sc), the process proceeds to step 212, and if St> Sc, the process proceeds to step 219 (step 21).
1).

In step 212, the value of the serial number Sm of the received message is checked, and if Sm = Sc + 1, it is determined that the received message is a multiplex message having a serial number to be passed to the next destination program 12, and the received message is transmitted. The received serial number is passed to the destination program 12 (step 214), and the serial number Sm of the received message is substituted for the provisional serial number St and the received current serial number Sc (step 213), and the processing of the receiving unit 15 is terminated.

On the other hand, if Sm ≦ Sc in step 212,
It is determined that the received message is a multiplex message having the same serial number as the multiplex message passed to the destination program 12 in the past (a multiplex message arriving later), the received message is discarded (step 215), and the processing of the receiving unit 15 is performed. To end.

On the other hand, at step 212, Sm = Sc + n (n
If ≧ 2), it is determined that a multiplex message having a serial number to be passed to the destination program 12 is missing, and a multiplex message having the same serial number as the lost multiplex message is transmitted to the other Network, ie
In order to expect the message to arrive from the network 2, a process of storing the received message in the temporary storage queue 19 without immediately passing the message to the destination program 12 is performed.

In the process, first, the serial number of the received message
Sm is substituted for the reception provisional serial number St and stored (step 216).

Thus, the receiving unit 15 changes from the state of St = Sc to the state of St> Sc, that is, if St> Sc,
When the serial number is lost, the received message is temporarily stored in the temporary storage queue 19.

Next, the received message is temporarily stored in queue 1
9 is stored at the end, and the maximum time to be stored in the temporary storage queue 19 is managed in case that the multiplex message having the same serial number as the lost multiplex message does not arrive (lost) from the other transmission network. For this purpose, time information obtained by adding the maximum storage time to the current time is added and stored in the temporary storage queue 19 (step 217).

Even after the lapse of the maximum time, the temporary storage queue 19
If it is stored in the other transmission network, it is determined that the multiplex message of the same serial number is lost in the other transmission network, and the multiplex message is taken out from the temporary storage queue 19, and
Processing to be passed to the destination program 12 is performed.

Note that this timeout processing is performed by the timeout processing unit 16. If the received message is stored at the head of the temporary storage queue 19, the timeout processing unit 16 has not been started yet. 16 is activated at this time.

The details of the timeout process will be described later.

Next, the address of the destination processing device attached to the received message is stored (step 218), and the processing of the receiving unit 15 ends.

This stored information is denoted by N for simplicity of description, and N is used to determine whether or not the multiplexed message stored in the temporary storage queue 19 can be retrieved later. Used when

The above is the processing to be performed when it is determined in step 211 that St = Sc in the receiving unit 15 of the implementation device that implements the multiplex message communication method of the present embodiment.

Next, a description will be given of a process performed when it is determined in step 211 that St> Sc in the receiving unit 15 of the apparatus for implementing the multiplex message communication method according to the present embodiment.

If St> Sc in step 211, that is, if a multiplexed message is received in a state where the serial number is missing and the received message is temporarily stored in the temporary storage queue 19, the processing after step 219 is performed. .

First, in step 219, the value of Sm is checked.
If Sm = Sc + 1, it is determined that the received message is the next multiplex message to be passed to the destination program 12 (it is determined that the multiplex message having the same serial number as the multiplex message lost in the other transmission network has been received). Then, the received message is passed to the destination program 12 (step 221), and the serial number Sm of the passed received message is substituted for the received current serial number Sc and stored (step 220), and stored in the temporary storage queue 19. In order to perform a process of extracting a multiplex message that can be passed to the next destination program 12 from among the multiplex messages being sent,
If Smq = Sc + 1, step 22 until Smq ≠ Sc + 1.
Steps 3 to 225 are repeated (step 22
2).

At the time of execution of step 223, Smq = Sc + 1, and the multiplex message at the head of the temporary storage queue 19 is
Next, since it is a multiplex message to be passed to the destination program 12, Smq is substituted for Sc (step 223), and the multiplex message at the head of the temporary storage queue 19 is fetched (step 224). 12 (step 225).

After step 225, the temporary storage queue 19
If there is a multiplexed message, the process returns to step 222, compares Smq of the new multiplexed message at the beginning with Sc + 1, and determines again whether or not the multiplexed message can be passed to the destination program 12.

On the other hand, at step 219, Sm = Sc + n (n ≧ 2)
If so, the process proceeds to step 226 instead of the serial number multiplex message to be passed to the destination program 12 next.

At step 226, the Sm of the received message
And sort the processing according to the state of St.

If Sm <St in step 226, it is not a multiplex message with a serial number to be passed to the destination program 12, but it is determined that the multiplex message with a serial number to be passed has been lost in both transmission networks. To 238 are performed.

Since the multiplexed message with the serial number before Sm of the received message will not arrive in the future, in these processes, first, of the multiplexed messages stored in the temporary storage queue 19, all the multiplexed messages with the serial number of Sm or less are extracted. Smq> Sm
Until (Step 227), Smq is substituted for Sc (Step 228), the multiplex message at the head of the temporary storage queue 19 is extracted (Step 229), and the extracted multiplex message is passed to the transmission destination program 12 (Step 2).
30) Perform processing.

Next, it is determined whether or not the received message can be passed to the destination program 12. In the apparatus for implementing the multiplex message communication method according to the present embodiment, the first multiplex message is transmitted to the destination program 12. If a multiplex message having the same serial number as the received message has already been passed to the destination program 12 in the processing of steps 227 to 230, the process of discarding the received message is performed. To 234 are performed.

First, Sc and Sm are compared to determine whether the received message can be passed to the transmission destination program 12 (step 231). If Sc = Sm, the received message is discarded (step 2 transmission). First), if Sc ≠ Sm, then Sc to Sc
(Step 233), and passes the received message to the destination program 12 (step 234).

Next, in order to perform a process of extracting and passing the multiplex message left in the temporary storage queue 19 to be transferred to the transmission destination program 12, the processes of Step 235 to Step 238 are performed.

If Smq = Sc + 1, the processing of steps 236 to 238 is repeated until Smq ≠ Sc + 1 (step 235).

At the time of execution of step 236, Smq = Sc + 1, and since the first multiplex message in the temporary storage queue 19 is the next multiplex message to be passed to the destination program 12, Smq is substituted for Sc (step 236). The multiplex message at the head of the temporary storage queue 19 is extracted (step 237), and the extracted multiplex message is transferred to the transmission destination program 12 (step 238).

After step 238, the temporary storage queue 19
If there is a multiplexed message, the process returns to step 235, compares Smq of the new multiplexed message at the beginning with Sc + 1, and again determines whether or not the multiplexed message can be passed to the destination program 12.

When the process of step 235 is completed, the receiving process of the receiving unit 15 is completed.

Next, a description will be given of the processing in the case where Sm = St in step 226 in the receiving unit 15 of the implementing apparatus that implements the multiplex message communication method of the present embodiment.

In this case, the received message is not a multiplexed message of the serial number to be passed to the next destination program 12, but the multiplexed message of the serial number to be passed is lost in both transmission networks, and Sm before the received message. Since the multiplexed message with the serial number will not arrive in the future, the processes of steps 239 to 243 are performed in order to pass the multiplexed messages stored in the temporary storage queue 19 to the transmission destination program 12 in order from the top.

First, Sm is substituted for Sc (step 23).
9) Next, since St = Sm at this time, the multiplex message having the same serial number as the received message has already been stored in the temporary storage queue 1.
9 is stored in the destination program 12 on a first-come, first-served basis.
In the implementation device that implements the multiple message communication method of this embodiment, the received message is discarded (step 240).

Next, the processing of steps 242 to 243 is repeated for all the multiplex messages in the temporary storage queue 19 (step 241).

At step 242, the temporary storage queue 19
Of the multiplex message at the beginning of the destination program 12
Pass to.

When the repetition of step 241 is completed, the processing of the receiving unit 15 is completed, and at this time, the receiving unit 15 returns to the state of St = Sc.

Next, a description will be given of a process in the case where Sm> St in step 226 in the receiving unit 15 of the apparatus for implementing the multiplex message communication method according to the present embodiment.

In this case, the processing differs depending on which of the multiplexed transmission networks has received the multiplexed message. Therefore, in step 244, the address of the destination processor of the received message and the previous reception processing are stored. Compare with the set N, and if they are equal, step 245
To 246, and if they are not equal, the processes of steps 247 to 256 are performed.

At step 244, if the destination processor address of the received message is the same as the N stored in the previous processing, the multiplex message having the serial number before Sm of the received message is transmitted to the other transmission network. It is determined that there is a possibility that the message will arrive via the server, and processing for storing the received message in the temporary storage queue 19 is performed.

First, Sm is substituted for St (step 24).
5) Next, time information obtained by adding the maximum storage time to the current time is added, and the received message is stored at the end of the temporary storage queue 19 (step 246), and the processing of the receiving unit 15 ends.

On the other hand, if it is determined in step 244 that the address of the destination processor of the received message is not equal to the N stored in the previous receiving process, the multiplex message having a serial number before Sm of the received message is transmitted to the other transmission line. Since there is no possibility of arriving via the network, first, the processes of steps 247 to 250 are performed in order to perform the process of passing the multiplexed messages stored in the temporary storage queue 19 to the transmission destination program 12 sequentially from the top. .

The processing of steps 248 to 250 is repeated for all the multiplex messages in the temporary storage queue 19 (step 247).

In step 248, Smq is substituted for Sc. In step 249, the multiplex message at the head of the temporary storage queue 19 is extracted. In step 250, the extracted multiplex message is passed to the transmission destination program 12.

When the repetition of step 247 is completed, the process proceeds to step 251 to process the received message. The processing at this time differs depending on the value of Sm of the received message.

If Sm = Sc + 1 in step 251, it is determined that the received message is a multiplex message of a serial number to be passed to the destination program 12 next, and Sm is substituted for St and Sc (step 252). Is passed to the transmission destination program 12 (step 253), and the processing of the reception unit 15 is terminated.

At this point, the receiving section 15 is in the state of St = Sc.

On the other hand, at step 251, Sm = Sc + n (n ≧ 2)
If this is the case, a multiplexed message with a serial number of Sc + 1, Sc + 2,..., Sc + n-1 is missing, and the multiplexed message may arrive from another transmission network other than the transmission network through which the received message was transmitted. Therefore, the processing of steps 254 to 256, which is the processing of storing the received message in the temporary storage queue 19, is performed.

The processing of steps 254 to 256 is the same as the processing of steps 216 to 218.

As described above, the processing performed by the receiving unit 15 is performed in the apparatus for implementing the multiplex message communication method according to the present embodiment.

Next, a description will be given of the processing of the timeout processing unit 16 of the implementing apparatus that implements the multiplex message communication method of the present embodiment.

The time-out processing unit 16 monitors the storage time of the multiplex message stored in the temporary storage queue 19 to prevent the multiplex message from being stored in the temporary storage queue 19 forever, This is a processing unit that takes out a multiplex message stored in the temporary storage queue 19 for a time (timeout time) or more and passes it to the transmission destination program 12, and is started by the reception unit 15.

That is, the multiplex message stored in the temporary storage queue 19 arrives in the hope that the multiplex message of the serial number preceding this multiplex message will be transmitted through another transmission network in the future. Although waiting, the time-out processing unit 16 retrieves the multiplex message stored in the temporary storage queue 19, which means that the reception of the multiplex message of the serial number preceding this multiplex message has been abandoned. I have.

FIG. 9 is a diagram showing the processing contents of the timeout processing unit 16 of the apparatus for implementing the multiplex message communication method of this embodiment.

As shown in FIG. 9, the timeout processing unit 16 of the apparatus for implementing the multiplex message communication method of the present embodiment executes the multiplex message stored in the temporary storage queue 19 even after the maximum storage time has elapsed. A process of extracting and transferring the extracted program to the destination program 12 is performed.

[0200] Let T denote the predetermined maximum storage time in which the multiplex message is stored in the temporary storage queue 19 in advance.

When the timeout processing unit 16 is started in the apparatus that implements the multiplex message communication method of the present embodiment, the value of T is set as the timeout time (step 261).

Next, the processing is interrupted for this timeout period (step 262).

Thereafter, the presence / absence of a multiplex message in the temporary storage queue 19 is determined (step 263), and if there is any (step 263; Yes), the current time is obtained (step 264). The time information added to the multiplex message is examined to determine whether or not the current time has passed this time (step 265).

If it is too much (step 265; Ye
s) In order to take out the multiplexed message and pass it to the destination program 12, Smq is substituted for Sc (step 26).
6), fetch the multiplex message at the head of the temporary storage queue 19 (step 267), and pass the fetched multiplex message to the destination program 12 (step 268).

When the processing in steps 265 to 268 is completed, the flow advances to step 269, where the temporary storage queue 19
It is determined whether or not a multiplex message remains in the step (step 269).
s) In order to monitor the timeout of the first multiplex message, the current time is acquired again (step 27).
0), a time obtained by subtracting the current time from the time information added to the first multiplex message in the temporary storage queue 19 is set as a new timeout time (step 27).
1).

If the time-out time becomes smaller than "0", "0" is set for the time-out time, and the process returns to C in the PAD diagram.

The processing performed by the timeout processing unit 16 has been described above.

Here, an overall flow of a multiplex message transmission / reception process between two processing devices in an apparatus for implementing the multiplex message communication method of the present embodiment will be described with reference to FIG.

FIG. 10 is a diagram showing an outline of a flow of a multiplex message between the processing units of the implementing apparatus for implementing the multiplex message communication method of the present embodiment. In FIG. 10, 32
Is a destination program, 33 is a communication unit, 35 is a receiving unit, 3
6 is a timeout processing unit, 38 is a serial number management table, 3
9 is a temporary storage queue, and 40 and 41 are communication adapters.

As shown in FIG. 10, in the flow of the multiplex message between the processing apparatuses of the apparatus for implementing the multiplex message communication method of this embodiment, the processing apparatus 10
5 shows the flow of a multiplex message when a multiplex message is transmitted using a duplex network. The configuration of the processing device 10 is the same as that described above.

In the configuration of the processing device 30, the transmission destination program 32 is the same program as the transmission destination program 12, the communication unit 33 is the communication unit 13, the reception unit 35 is the reception unit 15, and the timeout processing unit 36 Is the timeout processing unit 16, the serial number management table 38 is the serial number management table 18, the temporary storage queue 39 is the temporary storage queue 19,
Communication adapters 40 and 41 are communication adapters 20 and 21
It has the same function as.

Although the communication units 13 and 33 have components not shown in the figure, only those necessary for the description are shown here.

In this system configuration, the communication adapter 2
0 and the communication adapter 40 are connected via the network 1, and the communication adapter 21 and the communication adapter 41 are connected via the network 2.

When a transmission request for a multiplex message is issued from the transmission source program 11, the transmission unit 14 of the processing unit 10, which is the transmission source processing unit, searches the address table 17 and searches for the address of the processing unit 30, which is the transmission destination processing unit. And the transmission serial number of the multiplex message addressed to the processing device 30 is obtained, and the multiplex message to be transmitted to the networks 1 and 2 is created.

Next, the created multiplex message is passed to the communication adapters 20 and 21, respectively.
To the communication adapters 40 and 41, respectively.
Deliver to

On the other hand, the receiving unit 35 of the processing unit 30 of the destination processing unit receives the multiplex message from the communication adapters 40 and 41, and uses the temporary storage queue 39, the serial number management table 38, and the timeout processing unit 36 as shown in FIG. ~
The reception processing described with reference to FIG. 8 is performed, one of the first messages is selected from the multiplex message, and the one is transferred to the transmission destination program 32.

The above is the flow of the transmission / reception processing of the multiplex message corresponding to one transmission request.

Next, an example of processing in the case where a plurality of multiplex messages are continuously received by the apparatus for implementing the multiplex message communication method of this embodiment will be described with reference to the drawings.

FIG. 11 is a diagram showing a first example of a process of receiving a plurality of multiplex messages by an apparatus which implements the multiplex message communication method according to the present embodiment.

As shown in FIG. 11, in the processing for receiving a plurality of multiplexed messages by the apparatus for implementing the multiplexed message communication method of the present embodiment, the plurality of multiplexed messages are continuously transmitted from the processing apparatus 10 to the processing apparatus 30. FIG. 8 shows a reception process when a multiplex message is lost in one of the transmission networks.
Of the received provisional serial number and the reception current serial number, and how to discard or take in the received message.

The multiplex message received by the communication adapter 40 is now An (n = 1, 2,...; N is a serial number).
The multiplexed message received at 1 is Bn (n = 1, 2, ..; n is a serial number), the provisional reception serial number is St, the reception current serial number is Sc, and the serial number of the first multiplex message in the temporary storage queue 39 is Smq. The communication unit 33 of the processing device 30 of the transmission destination sets the time t.
It is assumed that one multiplex message is received at 1, t2, t3, t4, t5,.

FIG. 11 shows that the communication unit 33 of the processing device 30 of the transmission destination sets A at times t1, t2, t3, t4, t5, t6, and t7, respectively.
1, B1, A2, B2, A4, B3, and B4 are shown when the reception processing is performed. One of the multiplex messages having the serial number “3” is a transmission network (A3). Lost on that another multiple message (B3)
This example shows a case where the next multiplex message (A4) with the next serial number arrives from the transmission network side where the multiplex message has been lost before the message arrives.

At time t1, the receiving unit 35 of the processing device 30
Since St (= 0) = Sc (= 0) and Sm (= 1) = Sc (= 0) +1, the received A1 is passed to the transmission destination program 12, and Sm
(= 1) is substituted for Sc and St.

At time t2, St (= 1) = Sc (= 1) and Sm
Since (= 1) ≦ Sc (= 1), the received B1 is discarded.

At time t3, St (= 1) = Sc (= 1) and Sm
Since (= 2) = Sc (= 1) +1, the received A2 is passed to the destination program 12, and Sm (= 2) is substituted for Sc and St.

At time t4, St (= 2) = Sc (= 2) and Sm
Since (= 2) ≦ Sc (= 2), the received B2 is discarded.

At time t5, St (= 2) = Sc (= 2) and Sm
Since (= 4) = Sc (= 2) +2, the received A4 is stored in the temporary storage queue 39, and Sm (= 4) is substituted for St.

At time t6, St (= 4)> Sc (= 2) and Sm (=
3) Since = Sc (= 2) + 1, the received B3 is passed to the destination program 12, and Sm (= 3) is substituted for Sc.

The serial number Smq of the multiplex message at the head of the temporary storage queue 39 is checked, and Smq (= 4) = Sc (= 3) +1
Therefore, the multiplex message at the head of the temporary storage queue 39 is passed to the destination program 12, and Smq (= 4) is substituted for Sc.

At time t7, St (= 4) = Sc (= 4) and Sm
Since (= 4) ≦ Sc (= 4), the received B4 is discarded.

One of the multiplex messages of serial number “3” is lost on the transmission network (A3),
Before the other multiplex message (B3) arrives,
The multiplex message (A4) of the next serial number has arrived from the transmission network side where the multiplex message has been lost. By the above processing, the transmission destination program 32 makes the serial numbers “1”, “2”, “3”. And the multiplex message of "4" can be received in the order of the serial number.

FIG. 12 is a diagram showing a second example of the reception processing of a plurality of multiplex messages by the implementing apparatus for implementing the multiplex message communication method of the present embodiment.

As shown in FIG. 12, in the reception processing of a plurality of multiplex messages of the implementing apparatus for implementing the multiplex message communication method of the present embodiment, a plurality of multiplex messages are continuously transmitted from the processing apparatus 10 to the processing apparatus 30. FIG. 9 shows a reception process when a multiplex message is lost in both transmission networks.
At time t1, t2, t3, t4, t5, t6, t7, t8
FIG. 9 shows a state of a reception process when B1, A2, B2, A7, B3, B5, and B7 are received.

[0234] The receiving unit 35 of the processing device 30 operates at times t1, t
At 2, t3 and t4, the same processing as the processing shown in FIG. 11 is performed.

At time t5, St (= 2) = Sc (= 2) and Sm
Since (= 7) = Sc (= 2) +5, the received A7 is stored in the temporary storage queue 39, and Sm (= 7) is substituted for St.

At time t6, St (= 7)> Sc (= 2) and Sm
Since (= 3) = Sc (= 2) +1, it is determined that the received message is a multiplex message having a serial number (= 3) to be passed to the destination program 12, and the received B3 is transmitted to the destination program 12. Pass and substitute Sm (= 3) for Sc.

The serial number Smq of the multiplex message at the head of the temporary storage queue 39 is checked, and Smq (= 7) = Sc (= 3) +4
Therefore, there is a possibility that multiple messages of serial numbers “4”, “5” and “6” may arrive, and the temporary storage queue 3
The multiplex message No. 9 is not taken out, and the process is terminated as it is.

At time t7, St (= 7)> Sc (= 3) and Sm
Since (= 5) = Sc (= 3) +2 and Sm (= 5) <St (= 7), the received message is not a multiplex message with a serial number (= 4) to be passed to the next destination program 12. Since the multiplex message with the serial number "4" will not arrive in the future, the received B5 is passed to the destination program 12, and Sm (= 5) is substituted for Sc.

The serial number Smq of the multiplex message at the head of the temporary storage queue 39 is checked, and Smq (= 7) = Sc (= 5) +2
Therefore, there is a possibility that the multiplex message of the serial number “6” may still arrive, and the multiplex message of the temporary storage queue 39 is not taken out, and the process is terminated as it is.

At time t8, St (= 7)> Sc (= 5) and Sm
(= 7) = Sc (= 5) +2 and Sm (= 7) = St (= 7) Therefore, the received B7 is discarded, and Sm (= 7) is substituted for Sc, and the temporary storage queue 39 All the multiplexed messages are extracted in order from the top, and A7 is passed to the transmission destination program 12.

As a result of the above processing, the multiplexed messages with serial numbers "4" and "6" are lost on both transmission networks, and the multiplexed message with serial number "7" is lost at the destination processing device 30. Although the message arrives earlier than the multiplex message of “3” and “5”, the destination program 32
The first one of the multiplexed messages of serial numbers "1", "2", "3", "5" and "7" other than the serial numbers "4" and "6" lost on both transmission networks, You can receive them in order of serial number.

As described above, the transmission destination processing device of the embodiment that implements the multiplex message communication method of the present embodiment controls the detection of the multiplex message and the serial number control of the fetching process using the provisional reception serial number and the reception current serial number. ing.

[0243] By using these two serial numbers, the destination processing device can determine whether the received message is a multiplex message having a serial number to be passed to the destination program 12 next time when the multiplex message is received from the transmission network. Since it is possible to immediately determine whether or not the multiplexed message should be stored and whether or not the multiplexed message can be discarded, the reception processing overhead of the transmission destination processing device can be reduced.

Further, the criterion for giving up the reception of the multiplexed message of the missing serial number is clarified by the implementing apparatus for performing the multiplexed message communication method of the present embodiment, so that the queue capacity for temporarily storing the multiplexed message can be reduced. .

As described above, according to the apparatus for implementing the multiple message communication method of the present embodiment, the message transmission between a plurality of processing apparatuses can be made highly reliable.

That is, according to the apparatus for implementing the multiplex message communication method of the present embodiment, even if a failure occurs in a certain transmission network, transmission of a multiplex message between a plurality of processing apparatuses can be performed using a normal transmission network. If a message can be transmitted or a message is lost during transmission on one transmission network, the multiplex message is transmitted through another transmission network. It can be concealed and can be reliably delivered to the program of the destination processing device in the order of the serial numbers without missing the serial numbers.

In particular, in the case where two paths are provided as transmission paths for multiplexed messages between processing apparatuses, such as when the transmission network between a plurality of processing apparatuses is duplicated,
It is possible to make message transmission highly reliable.

In order to achieve this high reliability, the overhead, throughput,
There is an advantage that the required buffer capacity and steady load are small.

Also, in the description of the apparatus for implementing the multiple message communication method of the present embodiment, an example using one-to-one as a communication method between processing apparatuses has been described, but the communication method is not limited to this. Alternatively, multicast communication or broadcast communication can be used.

In general, at this time, the destination processing device indicated by the address of the destination processing device is not unique in the system, and a plurality of destination processing devices receive a multiplex message of one address.

However, in the implementation apparatus that implements the multiplex message communication method of the present embodiment, each destination processing apparatus independently performs the reception processing and the serial number control.
The present invention is applicable even when one destination is shared by a plurality of destination processing devices.

Therefore, the apparatus for implementing the multiplex message communication method of this embodiment is applicable even when the transmission source processing apparatus uses multicast communication or broadcast communication as the communication method, and uses multicast communication or broadcast communication. This makes it possible to increase the reliability of passing a multiplex message to the programs of the plurality of destination processing devices in the order of the serial numbers transmitted by the transmission source processing device.

Further, in the apparatus for implementing the multiple message communication method of the present embodiment, the description has been made on the assumption that one transmission network is connected to a single communication adapter. May be connected.

In this case or in the case described so far, the communication section 33 uses a network identifier such as a network address, a network broadcast address, or a MAC address or an IP address of the communication adapter as the communication adapter identifier or the communication adapter number. Alternatively, an identifier such as a port number or a socket identifier provided by each communication adapter may be used.

Also, as a process for preventing the multiplex message from staying in the temporary storage queue 19 of the apparatus for implementing the multiplex message communication method of the present embodiment, the time-out process is not used, and the multiplex message in the temporary storage queue 19 is not used. May be determined, and whenever the number of multiplexed messages in the temporary storage queue 19 exceeds this upper limit, only one leading multiplexed message may be extracted.

In the case where the above processing is performed, the timeout processing section 16 is unnecessary, and
7. The processing in steps 246 and 255 may be changed as follows.

That is, when a received message is stored at the end of the temporary storage queue 19, the number of multiplexed messages existing in the temporary storage queue 19 is counted.
A multiplex message is taken out from the top of 9 and passed to the destination program 12.

The process of extracting one multiplex message from the head of the temporary storage queue 19 and passing it to the destination program 12 is the same as the process described in steps 266 to 268.

Further, in the apparatus for implementing the multiplex message communication method of this embodiment, a relay processing apparatus for relaying multiplex messages may be provided between the transmission source processing apparatus and the transmission destination processing apparatus.

This relay processing device may be a device generally called a repeater, a bridge, a router or a gateway, which relays the multiplexed message without changing the content, or may process the multiplexed message content and perform processing based on the multiplexed message content. It may be a device that executes its own process, creates a new multiplex message, and sends it to the destination processing device.

In the latter case, however, it is assumed that the relay processing device adds the identifier assigned by the transmission source processing device to the multiplexed message to be transmitted by itself and transmits the multiplexed message.

Therefore, in a system configuration generally called a client server system, the source processing device may be used as a client, the relay processing device as a server, and the destination processing device as a server.

In the above description, each processing device is connected to each other by two transmission networks. However, a plurality of transmission networks having different addresses are connected by using a relay processing device such as a router. However, it is possible to use only one transmission network connected to the transmission source processing device. In this case, only one transmission communication adapter may be used.

In the above description, a single communication adapter is connected to only one transmission network. However, a single communication adapter may be connected to a plurality of transmission networks.

In this case, the single communication adapter can hold a plurality of reception addresses, associate each with a transmission network to be connected, and hold itself in a multiplex message transmitted on the transmission network. Only the multiplex message addressed to the received address is taken and passed to the communication unit 13.

In this case, the processing can be performed by the communication unit 33 described above.

In the above, the case where each processing device is connected by a duplicated transmission network has been described. However, the present invention is applied to a case where each processing device is connected by one non-multiplexed transmission network. The form will be described.

In general, duplication of the transmission network mainly has the following two points.

(1) The fault tolerance of the transmission network against faults is improved, and message transmission can be performed using a normal transmission network even when a fault occurs.

(2) The loss of the serial number with respect to the loss of the multiplex message transmitted on the transmission network is concealed, and the multiplex message can be transmitted without missing the serial number.

However, in the case where only (2) is intended, the transmission network uses one transmission path without multiplexing and uses two transmission paths in response to one data transmission request from the transmission source program 11. Multiplexed messages may be created and sent to one and the same transmission network, and the destination processor may receive the two multiplexed messages from this single transmission network.

[0272] In this case, the transmission source processing device sequentially transmits the multiplexed message sets such that the transmission of a plurality of sets of multiplexed messages is started when the transmission of one set is completed and the transmission of the next one set is started. The transmission process may be performed, but one multiplex message may be transmitted in one set, and the transmission of the next set may be started before the transmission of the remaining multiplex messages is completed.

At this time, since the communication adapter holds only one reception address for the connected transmission network, one set of multiplex messages is transmitted to the same reception address, and two multiplex messages are sent to each multiplex message. Are assigned the same destination address.

The receiving unit 15 of the destination processing device can perform the processing shown in FIGS. 6 to 8, but in this case,
The timing of giving up the reception of the multiplex message of the serial number in which a missing message arrives later is delayed.

For this reason, an area for storing a multiplex message identifier for uniquely identifying the multiplex message is provided in the message format of the multiplex message.

The transmission unit 14 of the transmission source processing device prepares two fixed and different multiplex message identifiers, and when creating multiplex messages, stores the different multiplex message identifiers in the area of each multiplex message. To be added.

On the other hand, the receiving unit 15 of the destination processing device replaces the destination message processing device address of the received message used in steps 218 and 256 of FIGS.
Now, a newly provided multiple message identifier is used.

As described above, even if only one transmission path between the processing apparatuses is used, by transmitting two multiplexed messages to this transmission path at a time, the reliability of message transmission between the processing apparatuses can be improved. Can be achieved.

That is, by performing the above processing, even if there is only one transmission path between the processing devices, it is possible to conceal the loss of the serial number with respect to the loss of the multiplex message transmitted on the transmission network. Multiplex message can be transmitted without missing the serial number.

At this time, according to the apparatus for implementing the multiplex message communication method of the present embodiment, there are advantages that the overhead of the processing performed by the destination processing apparatus is small, the throughput is small, and the required buffer capacity is small. is there.

As described above, according to the apparatus for implementing the multiple message communication method of the present embodiment, if the serial number of the received message is not the serial number to be passed to the next destination program, the received message is temporarily stored in the queue. Since it is passed to the destination program after it is stored, it is possible to guarantee the sequence number of the multiplexed message and to make the message transmission highly reliable.

Further, according to the apparatus for implementing the multiplex message communication method of the present embodiment, a multiplex message is received using two pieces of serial number information of a provisional serial number and a reception current serial number. It is possible to increase the reliability of message transmission.

According to the apparatus for implementing the multiplex message communication method of the present embodiment, a multiplex message having a multiplex message identifier for identifying a plurality of multiplex messages created by duplicating the same data and adding the same serial number is added. , It is possible to improve the reliability of message transmission in a single transmission network.

Further, according to the apparatus for implementing the multiplex message communication method of the present embodiment, the relay processing is performed by adding the identifier added by the transmission source processing apparatus to the multiplex message to be transmitted to identify the multiplex message. Therefore, it is possible to increase the reliability of message transmission in the transmission network via the relay processing device.

(Embodiment 2) Hereinafter, in the multiplex message communication method of the present invention, a multiplex message is received by a plurality of transmission networks of duplex or more, and the first message is selected from the multiplex messages and transmitted to the destination program. A description will be given of an implementation device that implements the multiple message communication method according to the second embodiment that performs a passing process.

FIG. 13 is a diagram showing a schematic configuration of an apparatus for implementing the multiplex message communication method of the present embodiment.
In FIG. 13, reference numeral 3 denotes a network.

[0287] As shown in FIG. 13, the implementing apparatus for implementing the multiplex message communication method of the present embodiment is a network 3
have.

As shown in FIG. 13, in an apparatus for implementing the multiplex message communication method of this embodiment, the processing apparatuses 10, 30, 50 and 70 are connected to networks 1 to 3, respectively. Communication is performed between the processing devices via the networks 1 to 3.

The processing units 10, 30, 50 and 70 of the implementing apparatus for implementing the multiple message communication method of the present embodiment and the networks 1 to 3 are the same as those described in the first embodiment.

Although FIG. 13 shows only three transmission networks, the number of transmission networks is not limited in an apparatus that implements the multiplex message communication method of the present embodiment.
If it is two or more, any number may be used as long as it is physically connectable.

[0291] Hereinafter, in the description of the apparatus for implementing the multiplex message communication method of this embodiment, it is assumed that each processing apparatus is connected by a total of N transmission networks.

The format of the multiplex message transmitted between the processing devices 10, 30, 50 and 70 via the networks 1 to 3 is the same as the format shown in FIG.

Next, referring to FIG.
The configurations of 0, 50, and 70 will be described.

FIG. 14 is a diagram showing a schematic configuration of the processing device 10 of the execution device for executing the multiplex message communication method of the present embodiment. In FIG. 14, reference numeral 22 denotes a communication adapter.

[0295] As shown in Fig. 14, the processing device 10 of the implementation device that implements the multiplex message communication method of the present embodiment comprises:
It has a communication adapter 22.

Further, as shown in FIG. 14, the processing apparatus 1 of the implementation apparatus for implementing the multiplex message communication method of the present embodiment.
0, the multiplex message of the transmission source program 11 is transmitted to the networks 1 to 3 via the communication unit 13 and the communication adapters 20 to 22, and the multiplex message on the networks 1 to 3 is transmitted to the communication adapters 20 to 22 and the communication unit. 13 to the destination program 12, and the processing device 30,
50 and 70 have the same configuration.

In the apparatus for implementing the multiplex message communication method of the present embodiment, the internal configuration of the processing apparatus 10 is almost the same as that of the first embodiment, and only different parts will be described.

The processing apparatus 10 has a number of communication adapters 20 to 20 equal to the number of transmission networks to which the processing apparatus 10 is connected.
22 and is connected to networks 1-3.

[0299] When the processing apparatus 10 of the apparatus for implementing the multiplex message communication method of this embodiment is connected to a plurality of N transmission networks, the processing apparatus 10
Has N communication adapters 20 to 22.

In the apparatus for implementing the multiple message communication method according to the present embodiment, the communication unit 13 individually identifies each communication adapter with a certain communication adapter identifier, and each communication adapter is described in the first embodiment. It is assumed that it has the same function as the above.

[0301] In addition, for the sake of simplicity of description, each communication adapter will be referred to as "communication adapter 1", "communication adapter 2", "communication adapter N", and the like.

The case where a single communication adapter is connected to a plurality of transmission networks will be described later.

[0303] Next, the internal configuration and processing of the communication unit 13 of the implementation apparatus that implements the multiplex message communication method of the present embodiment will be described. The internal configuration and processing of the communication unit 13 are the same as those of the first embodiment. Since it is the same, only different parts will be described.

[0304] The serial number management table 18 of the implementing apparatus that implements the multiple message communication method of the present embodiment is the same as that of the first embodiment.
The configuration described in is changed to the configuration shown in FIG.

FIG. 15 is a diagram showing an example of the configuration of the serial number management table 18 of the embodiment which implements the multiplex message communication method of the present embodiment. In FIG. 15, reference numeral 125-1 denotes a communication adapter 1 serial number portion, reference numeral 125-2 denotes a communication adapter 2 serial number portion, and reference numeral 125-N denotes a communication adapter N serial number portion.

As shown in FIG. 15, the serial number management table 18 of the apparatus that implements the multiplex message communication method of this embodiment includes a communication adapter 1 serial number section 125-1, a communication adapter 2 serial number section 125-2, Communication adapter N serial number section 12
5-N.

Also, as shown in FIG. 15, in the serial number management table 18 of the implementing device that implements the multiplex message communication method of the present embodiment, the processing device identifier section 121 and the transmission serial number section 122 are the same as those of the first embodiment. However, N multiplex messages with the same serial number as the serial number stored in the transmission serial number unit 122 are created and transmitted to N transmission networks.

Communication adapter 1 serial number section 125 shown in FIG.
-1, the communication adapter 2 serial number section 125-2 and the communication adapter N serial number section 125-N are added in the implementation device for implementing the multiplex message communication method of the present embodiment. Of the multiplexed network reception serial number is stored.

[0309] The multiplexed network reception serial number is a serial number that is introduced in an apparatus that implements the multiplexed message communication method of the present embodiment, and is used by the destination processing apparatus for each of the multiplexed transmission networks and for the source processing. This is a reception serial number managed for each device, and is a value set according to the following rules.

That is, the larger of the following two is
The multiplexed network reception serial number of the transmission network is used.

The maximum value of the serial number of the multiplex message received by the transmission network The maximum value of the serial number of the multiplex message passed to the destination program 12 among the multiplex messages received by all the transmission networks In the implementation device that implements the message communication method, the transmission destination processing device controls the received message using the set of the multiplexed network reception serial numbers.

The details of the serial number changing process, the multiplex message detecting process, and the sequence control process will be described in detail when the process of the receiving unit 15 is described.

Next, a description will be given of the transmitting section 14 of the apparatus for implementing the multiplex message communication method of the present embodiment. Since the transmitting section 14 is almost the same as that of the first embodiment, only different portions will be described. .

In the apparatus for implementing the multiplex message communication method of the present embodiment, one multiplex message is created for each transmission network, ie, a total of N multiplex messages in response to one transmission request from the transmission source program 11. Are passed to each communication adapter corresponding to the transmission network, and then transmitted to the transmission network by each communication adapter.

[0315] In the following, in the apparatus for implementing the multiplex message communication method according to the present embodiment, the processing in which the receiving unit 15 receives a multiplex message will be described with reference to Figs.
This will be described in detail with reference to a PAD diagram.

FIGS. 16 and 17 are diagrams showing the processing contents of the receiving unit 15 of the apparatus for implementing the multiple message communication method of the present embodiment.

As shown in FIGS. 16 and 17, the receiving unit 1 of the apparatus for implementing the multiple message communication method of the present embodiment.
In No. 5, a number is used as each communication adapter identifier, and for simplification of description, numbers “1” to “N” are given to each of the N communication adapters.

Hereinafter, this number is referred to as a communication adapter number, and each communication adapter is identified by this number.

Also, the value of the multiplexed network reception serial number is
Slan, and in particular, the multiplexed network reception serial number corresponding to the communication adapter number r is described as Slan (r).

Here, the variable r is the number of the communication adapter that has received the multiplex message, and r takes a value of “1” to “N”.

Also, since the receiving unit 15 receives N multiplexed messages from one transmission source processing device via each of N transmission networks, the reception unit 15 multiplexes one transmission source processing device for each communication adapter. Network reception serial number Sl
will have an.

The calculation for obtaining the minimum value of the multiplexed network reception serial number Slan for each communication adapter for one transmission source processing device is defined as min (Slan (1), Slan (2),..., Slan
(N)), and the result of the calculation is denoted by M.

The calculation for finding the maximum value of the two multiplexed network reception serial numbers, for example, the calculation for finding the maximum value of Slan (1) and Slan (2) is called max (Slan (1), Slan (2)). write.

The processing performed by the receiving unit 15 shown in FIGS. 16 and 17 will be described below using the symbols defined above.

When receiving the multiplex message from any one of the communication adapters 20 to 22, the receiving unit 15 of the destination processing device of the apparatus that implements the multiplex message communication method of the present embodiment changes the communication adapter number of the communication adapter. Variable r
(Step 311). Then, the multiplexed network reception serial number Slan (r) corresponding to the source processor address of the received message and the reception communication adapter number r in the serial number management table 18 is acquired, and received. The sequence number Sm added to the message is compared, and if Sm ≦ Slan (r), the received message is discarded (step 313), and Sm> Slan
If (r), the process proceeds to step 314 and subsequent steps (step 312).

That is, in step 312, it is determined whether the received message is a multiplex message to be discarded or a multiplex message to be fetched and processed using only the values of Slan (r) and Sm.

As described above, Slan is the maximum value of the serial number of the multiplex message received by the transmission network and the maximum value of the serial number of the multiplex message passed to the destination program 12 among the multiplex messages received by all the transmission networks. Since the larger of the two values is the value, the multiplex message having a serial number equal to or less than this value is a multiplex message having the same serial number as the serial number already passed to the transmission destination program 12, and may be discarded.

Next, the processing after step 314 will be described.

First, the minimum value of the (N-1) Slan values excluding Slan (r) is obtained and set to M (step 314). Thereafter, this M, Slan (r) and Sm are calculated. The comparison is made, and the processing is sorted according to the comparison result.

This comparison is made in steps 315 and 3
16 and 325 are performed for:

(1) If Slan (r) ≦ M and Sm = Slan (r) +1, the processing of steps 317 to 324 is performed.

(2) Slan (r) <M and Sm = Slan (r) + n (n ≧ n)
If it is 2), the processing of steps 326 to 335 is performed.

(3) Slan (r) = M and Sm = Slan (r) + n (n ≧
If 2), the processing of steps 336 to 337 is performed.

(4) If Slan (r)> M, step 33
Steps 8 to 339 are performed.

Hereinafter, the processing of (1) to (4) will be described respectively.

First, the process (1) will be described.

(1) is a process when the received message is a multiplex message of a serial number to be passed to the next destination program 12 next.

[0338] Here, the received message is passed to the destination program 12, and the multiplex message stored in the temporary storage queue 19 is next sent to the destination program 1.
Then, a multiplexed message having a serial number to be passed to No. 2 is sequentially passed to the destination program 12 from the top.

In the above processing, first, the value of Sm is stored in Slan (r), and the value of the multiplexed network reception serial number is updated.
For all corresponding Slan (t) (t = 1,2, ..., N), Slan
larger than (r), that is, max (Slan (t), Slan
(r)) is updated as a new value of Slan (t) (Step 3)
17-Step 318).

Next, the received message is passed to the transmission destination program 12 (step 319), and the multiplex message stored in the temporary storage queue 19 is added to the transmission destination program 1 next.
2 to determine whether there is a multiplex message having a good serial number (Smq = Slan (r) +1 or not), and if so, Smq
Step 321 to Step 3 until ≠ Slan (r) +1
24 is repeated (step 320).

In the processing of steps 321 to 324, Sl is updated in order to update the value of the multiplexed network reception serial number.
The value of Smq is stored in an (r) (step 321), one multiplexed message is taken out from the head of the temporary storage queue 19 and passed to the destination program 12 (step 322), and all corresponding Slan (t) ( t = 1,2, ..., N), Slan (r)
Is updated as a new value of Slan (t) (step 323 to step 324).

Next, the process (2) will be described.

(2) is a process in a case where a multiplex message arrives from a transmission network having the smallest Slan value in a state where a multiplex message of a serial number preceding a received message is missing.

In this case, the received message is temporarily stored in the temporary storage queue 19 in the order of the serial number, and the multiplex message of the serial number before this serial number does not arrive. The received multiplex message is transferred to the transmission destination program 12, and thereafter, a multiplex message having a serial number to be sequentially passed to the transmission destination program 12 is sequentially extracted from the next head multiplex message in the temporary storage queue 19 and passed. .

In the above processing, first, the value of Sm is stored in Slan (r) (step 326), and then the received messages are stored in the temporary storage queue 19 in order from the smallest one from the top in order of serial number. Is stored (step 32
7).

However, if a multiplex message having the same serial number as the received message has already been stored in the temporary storage queue 19, the received message is discarded.

Next, the multiplex message at the head of the temporary storage queue 19 is fetched and passed to the transmission destination program 12 (step 328). In order to update the value of the multiplex network reception serial number, all the corresponding Slan (t) s are updated. (t = 1,2, ..., N)
Max (Slan (r)) which is larger than Slan (r).
(t), Slan (r)) is updated as a new value of Slan (t) (steps 329 to 330).

Next, it is checked whether or not there is a multiplexed message of a serial number that can be passed to the next destination program 12 in the temporary storage queue 19, and if there is, if it is, Smq ≠ Slan (r) +1, Steps 332 to 335. Is repeated (step 331).

At step 332, the value of Smq is stored in Slan (r). At step 333, the multiplex message at the head of the temporary storage queue 19 is fetched and passed to the transmission destination program 12.

Next, in order to update the value of the multiplexed network reception serial number, all the corresponding Slan (t) (t = 1, 2,..., N) are larger than Slan (r). , That is, max (Sla
n (t), Slan (r)) is updated as a new value of Slan (t) (steps 334 to 335).

Next, the process (3) will be described.

(3) is a process in a case where a missing message occurs in a multiplex message having a serial number before a received message.

In this case, the received message is stored in the temporary storage queue 19 because there is a possibility that a multiplexed message with a missing serial number may arrive via another transmission network.

For this reason, first, the value of Sm is stored in Slan (r) (step 336), and then the received messages are stored in the temporary storage queue 19 such that the received messages are arranged in order from the smallest one from the top in the order of serial numbers. (Step 337).

However, if a multiplex message having the same serial number as the received message has already been stored in the temporary storage queue 19, the received message is discarded.

Next, the process (4) will be described.

[0357] Similarly to (3), (4) is a process in the case where omission has occurred in the multiplex message of the serial number preceding the received message.

[0358] In this case, the received message is stored in the temporary storage queue 19 because there is a possibility that a multiplexed message with a missing serial number may arrive via another transmission network.

Therefore, first, the value of Sm is stored in Slan (r) (step 338), and then the received messages are stored in the temporary storage queue 19 such that the received messages are arranged in order from the smallest one from the top in the order of serial numbers. (Step 339).

However, if a multiplex message having the same serial number as the received message has already been stored in the temporary storage queue 19, the received message is discarded.

[0361] The above is the processing of the receiving unit 15 of the implementation device that implements the multiplex message communication method of the present embodiment.

In the system configuration and the processing of each part described above, the apparatus for implementing the multiple message communication method of the present embodiment is implemented, but may be modified as follows.

In the description of the apparatus for carrying out the multiplex message communication method of this embodiment, an example in which one-to-one communication is used as a communication method between processing apparatuses has been described. However, the communication method is not limited to this. As in the first embodiment, multicast communication or broadcast communication can be used.

As a method for preventing the multiplex message from staying in the temporary storage queue 19, the time-out processing unit 16 can be used to temporarily execute the multiplex message communication method of the present embodiment using the timeout processing unit 16 as in the first embodiment. A process for preventing the multiplex message from staying in the storage queue 19 may be performed.

As described in the first embodiment, the maximum number of multiplexed messages in the temporary storage queue 19 is managed, and each time the maximum number is exceeded, only one leading multiplexed message is taken out. Processing may be performed.

As described above, in the apparatus for implementing the multiplex message communication method of this embodiment, the transmission destination processing apparatus uses the serial number set for each communication adapter, that is, for each transmission network.
It is possible to immediately determine whether the multiplexed message has a serial number to be passed to the multiplexed message, whether the multiplexed message should be temporarily stored, and whether the multiplexed message can be discarded. Is small.

Further, since the criterion for giving up the reception of the multiplexed message of the missing serial number is clarified by the apparatus for implementing the multiplexed message communication method of the present embodiment, the queue capacity for temporarily storing the multiplexed message can be reduced. .

As described above, according to the apparatus for implementing the multiplex message communication method of the present embodiment, a transmission network between a plurality of processing apparatuses can be multiplexed at an arbitrary multiplicity of two or more. The message transmission can be performed by using an arbitrary number of transmission networks in the network, and the reliability thereof can be improved.

As described above, according to the apparatus for implementing the multiple message communication method of the present embodiment, when the serial number of the received message is not the serial number to be passed to the next destination program, the received message is temporarily stored in the queue. Since it is passed to the destination program after it is stored, it is possible to guarantee the sequence number of the multiplexed message and to make the message transmission highly reliable.

Further, according to the apparatus for implementing the multiplex message communication method of the present embodiment, the multiplex message is received using the multiplex network reception serial number corresponding to each transmission network. It is possible to increase the reliability of message transmission in a multiplex network composed of transmission networks.

Although the present invention has been specifically described based on the above embodiment, the present invention is not limited to the above embodiment, and it is needless to say that various modifications can be made without departing from the scope of the invention. It is.

[0372]

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.

(1) If the serial number of the received message is not the serial number to be passed to the destination program next, the received message is stored in the temporary storage queue and then passed to the destination program, so the order of the serial numbers of the multiplex message is guaranteed. Thus, message transmission can be made highly reliable.

(2) Since a multiplexed message is received using two pieces of serial number information, ie, a provisional serial number and a current number, a highly reliable message transmission in a duplex network can be performed.

(3) Since multiplexed messages are received using multiplexed network reception serial numbers corresponding to the respective transmission networks, high reliability of message transmission in a multiplexed network including two or more transmission networks can be achieved. It is possible to do.

(4) Since a multiplex message with a multiplex message identifier for identifying a plurality of multiplex messages created by duplicating the same data and adding the same serial number is received, a high message transmission rate in a single transmission network is obtained. It is possible to perform reliability.

(5) Since the relay processing is performed by adding the identifier added by the transmission source processing device to the multiplexed message to be transmitted to identify the multiplexed message, the message transmission in the transmission network via the relay processing device is performed. Higher reliability can be achieved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration of an implementation device that implements a multiple message communication method according to a first embodiment.

FIG. 2 is a diagram illustrating an example of a format of a multiplex message of an implementation device that implements the multiplex message communication method according to the first embodiment.

FIG. 3 is a diagram showing a schematic configuration of a processing device 10 of an implementation device that implements the multiple message communication method of the first embodiment.

FIG. 4 is a diagram showing a configuration example of an address table 17 of an implementation device that implements the multiplex message communication method according to the first embodiment.

FIG. 5 is a diagram illustrating a configuration example of a serial number management table of an embodiment that implements the multiple message communication method according to the first embodiment;

FIG. 6 is a diagram showing processing contents of a receiving unit 15 of an implementation device that implements the multiplex message communication method of the first embodiment.

FIG. 7 is a continuation of the diagram showing the processing content of the receiving unit 15 of the implementation device that implements the multiple message communication method of the first embodiment.

FIG. 8 is a continuation of the diagram showing the processing contents of the receiving unit 15 of the implementation device that implements the multiplex message communication method of the first embodiment.

FIG. 9 is a diagram showing the processing contents of a timeout processing unit 16 of the implementation device that implements the multiple message communication method of the first embodiment.

FIG. 10 is a diagram showing an outline of a flow of a multiplex message between the processing apparatuses of the implementing apparatus that implements the multiplex message communication method of the first embodiment.

FIG. 11 is a flowchart illustrating a first example of a process of receiving a plurality of multiplex messages performed by an apparatus that implements the multiplex message communication method according to the first embodiment;
It is a figure showing the example of.

FIG. 12 is a diagram illustrating a second example of the reception processing of a plurality of multiplex messages of the implementation apparatus that implements the multiplex message communication method according to the first embodiment.
It is a figure showing the example of.

FIG. 13 is a diagram illustrating a schematic configuration of an implementation device that implements the multiple message communication method according to the second embodiment.

FIG. 14 is a diagram illustrating a schematic configuration of a processing device 10 of an implementation device that implements the multiplex message communication method according to the second embodiment.

FIG. 15 is a diagram illustrating a configuration example of a serial number management table of an embodiment that implements the multiple message communication method according to the second embodiment.

FIG. 16 is a diagram showing the processing content of a receiving unit 15 of an implementation device that implements the multiplex message communication method according to the second embodiment.

FIG. 17 is a continuation of the diagram showing the processing contents of the receiving unit 15 of the implementation device that implements the multiplex message communication method of the second embodiment.

FIG. 18 is a diagram showing a timing chart of a transmission process of a multiplex message in a duplex LAN configuration system of an implementation apparatus for implementing a conventional multiplex message communication method.

FIG. 19 is a diagram showing a timing chart of a missing serial number of a received message in a dual LAN configuration system of an implementation device for implementing a conventional multiple message communication method.

[Explanation of symbols]

1 and 2 ... network, 10, 30, 50 and 70 ...
Processing device, 101: DA unit, 102: DP unit, 103: SA
Unit, 104 SN unit, 105 DATA unit, 11 source program, 12 destination program, 13 communication unit, 14
... Sending unit, 15 ... Receiving unit, 16 ... Timeout processing unit,
17: address table, 18: serial number management table, 1
9: temporary storage queue, 20 and 21: communication adapter, 1
11: Program identifier part, 112: Processing device identifier part, 113: Communication adapter identifier part, 114: Destination address part, 121: Processing device identifier part, 122: Transmission serial number part, 123: Provisional reception serial number part, 124: Reception Current serial number section, 32: destination program, 33: communication section, 35
... Receiving unit, 36 ... Timeout processing unit, 38 ... Serial number management table, 39 ... Temporary storage queue, 40 and 41 ... Communication adapter, 3 ... Network, 22 ... Communication adapter, 1
25-1: Communication adapter 1 serial number section, 125-2: Communication adapter 2 serial number section, 125-N: Communication adapter N serial number section.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Matsuzaki 5-2-1 Omikacho, Hitachi City, Ibaraki Prefecture Inside Hitachi Process Computer Engineering Co., Ltd. (72) Inventor Seiichi Tamura 5-chome Omikacho, Hitachi City, Ibaraki Prefecture No. 2 1 Hitachi Process Computer Engineering Co., Ltd. (72) Inventor Katsumi Kono 1099 Ozenji Temple, Aso-ku, Kawasaki-shi, Kanagawa Prefecture System Development Laboratory, Hitachi, Ltd.

Claims (5)

[Claims] In a multiplex message communication method for transmitting and receiving a multiplex message created by duplicating the same data and adding the same serial number among a plurality of processing devices connected by a transmission network, the received message is transmitted to a destination program next. If the received message is a multiplex message to be passed, the received message is passed to the destination program, and the multiplex message having the serial number next to the passed received message in the temporary storage queue is sequentially passed to the destination program. If the multiplex message is not to be passed to the destination program, the received message is stored in the temporary storage queue. If the multiplex message to be passed to the destination program is not received, the multiplex message in the temporary storage queue is sequentially stored in the destination program. Message communication method characterized by passing to Law. 2. The method of claim 2, wherein the maximum value of the serial numbers of the received messages received by the two transmission networks is set as a provisional serial number, and the maximum value of the serial numbers of the multiplexed message passed to the destination program is set as the current reception serial number. Is passed to the destination program as a multiplexed message to be passed next, and if the serial number of the received message is larger than the serial number next to the received current serial number, Is equal to or the current reception serial number, or when the provisional reception serial number is greater than the reception current serial number, the reception message serial number is greater than the reception provisional serial number, and the transmission network that transmitted the reception message and the multiplex message of the reception provisional serial number is equal. , Assuming that the received message is not a When the received temporary number is greater than the current receive serial number and the serial number of the received message is greater than the next serial number after the current receive serial number, the serial number of the received message is less than or equal to the temporary receive serial number. If the message serial number is larger than the provisional reception serial number and the transmission network that transmitted the received message and the multiplex message of the reception provisional serial number are different, it is determined that the next multiplex message to be passed will not be received, 2. The multiplex message communication method according to claim 1, wherein the multiplex message having the reception provisional serial number or less is passed to the transmission destination program. 3. The multiplexing of the transmission network, the larger of the maximum value of the serial number of the received message of the specific transmission network among the plurality of transmission networks and the maximum value of the serial number of the multiplex message passed to the destination program. The multiplexed network reception serial number of the transmission network that transmitted the received message is equal to or smaller than the minimum value of the other multiplexed network reception serial numbers, and the received message serial number is the next serial number of the multiplexed network reception serial number. In some cases, the received message is passed to the destination program as the next multiplex message to be passed, and the multiplexed network reception serial number is equal to the minimum value of the other multiplexed network reception serial numbers, and the received message serial number is the multiplexed network reception serial number. Greater than the next serial number of the If the serial number is greater than the minimum value of the other multiplexing network reception serial number,
The received message is stored in the temporary storage queue as a multiplex message to be passed next, and the multiplexed network reception serial number is smaller than the minimum value of the other multiplexed network reception serial numbers, and the received message serial number is the multiplexed network reception serial number. 2. The multiple message communication method according to claim 1, wherein if the next serial number is larger than the next sequential number, the multiple messages in the temporary storage queue are sequentially passed to the transmission destination program assuming that the next multiple message to be passed is not received. . 4. A plurality of multiplex message identifiers for identifying a plurality of multiplex messages created by duplicating the same data and adding the same serial number to a message format, and adding the same data, the same serial number, and different multiplex message identifiers. A multiplex message is transmitted on a plurality of transmission networks virtually by transmitting the multiplex message on a single transmission network, and treating the multiplex message having the different multiplex message identifier as being transmitted on a different transmission network. 4. The multiplex message communication method according to claim 1, wherein a receiving process is performed assuming that the multiplexing is performed. 5. When a multiplex message is relayed via a relay processing device, an identifier added by a transmission source processing device for identification of the multiplex message is added to the multiplex message transmitted by the relay processing device and transmitted. The data is transmitted to the preceding processing device.
The multiple message communication method described in the section.