JP3475660B2 - Duplex communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to at least two
For reliable data exchange between the above controllers
The present invention relates to a duplex communication device. [0002] 2. Description of the Related Art In a case where redundant communication is performed between control devices.
Conventionally, the network is duplicated, that is, the first and the second
Communication sequence, and the same data is transmitted using both communication sequences.
They are transmitted at times or with a time lag. This kind of
An error is detected in one communication line in a redundant communication device
In this case, the data of the other communication series is used. That
Therefore, if one system fails, the other system will not be delayed.
Data reception and high reliability.
You. [0003] The above-mentioned conventional duplication
In communication equipment, to obtain high reliability,
Communication data is checked by error detection and correction function
Therefore, the content of the data when it can be received is not guaranteed.
You. Therefore, the data of the other communication series received later
Is not used. That is, the data of the two systems are collated
No need. Therefore, in a duplicated network
And transmitting exactly the same data is redundant and
There is a problem that communication speed and cost are too high. Cali
If you send separate data in two streams,
Can be secured, but only one data can be received in the event of an error.
There is a problem of lack of reliability. The present invention has been made in view of the above problems.
It can communicate at high speed all the time, and
For the purpose of providing a redundant communication device that can be secured
I have. [0005] SUMMARY OF THE INVENTION A dual communication device according to the present invention is provided.
The first device has at least a first communication between the first and second controllers.
For performing duplex communication using a communication sequence and a second communication sequence
In the first control device, data to be transmitted is provided to the first control device.
Dividing means into n pieces, and the first communication system
Means for sending the divided data to a column in a normal order;
Transmitting the divided data to the second communication sequence in reverse order
The second control device is divided into n units.
Reception that has an area for storing the transmitted data
Data storage means, transmitted from the first communication sequence
Data coming from the front end of the storage means to the storage means
Means for storing the information in order, and
The transmitted data is stored in the storage unit, after the storage unit.
Means for sequentially storing data from the end toward the front
It is. In this duplex communication device, the transmitting side
The data is transmitted from the first control device to the second control device on the receiving side.
When transmitting data, the original data is divided into n
The data divided by one communication sequence is the first divided data.
Data, second data, ..., nth data
, And send them in order. In addition, by the second communication sequence,
The divided data is the nth, n-1st, ..., 1st
Are transmitted in the reverse order of the first communication sequence in the order of data. [0007] In the second control device, the correctness of the first communication sequence
The received data sent in order is stored at the front end of the data storage means.
From the back, the first and the second are stored in order.
You. Also, the received data transmitted in the reverse order of the second communication sequence
Data from the rear end of the data storage means, and
The eyes and the (n-1) th are stored in this order. Which communication line
If there are no abnormalities, the stored data from the front end and the rear end
The transmission can be terminated wherever it hits,
High-speed communication becomes possible. In addition, in either communication series
If something goes wrong, keep the other memory
Allows correct data to be received and
Communication can be performed without any problem even at the time, and reliability can be secured. [0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The light will be described in more detail. FIG. 1 shows one embodiment of the present invention.
It is a block diagram which shows a form duplex communication apparatus. This double
The communication device includes two control devices 10 and 20 and an A-system network.
Network 1A, network of two systems of B system network 1B
Consists of a work. Also, for convenience of explanation,
Above, two control devices 10 and 20 are shown.
Three or more controllers that can exchange data with each other
Network 1A and B-system network 1B
May be used. The control unit 10 performs control calculations and data transfer.
CPU 11 that performs transmission control for
Memory 12 for storing communication data, reception data, etc.
, An A-system communication device 13A, and a B-system communication device 13B.
I have. Naturally, the A-system communication device 13A is connected to the A-system network.
The network B communication device 13B is connected to the network B
1B, respectively. Also, the control device 2
0, the CPU 21 and the memory 2
2, the A-system communication device 23A, and the B-system communication device 23B.
Have. [0010] The control device 10 and the control device 20 communicate with each other by A-system communication.
Devices 13A and 23A, and B-system communication devices 13B and 23B.
Can send or receive data from each other.
Wear. The most characteristic of the redundant communication device of this embodiment is
At the time, the A-system communication device and the B-system communication device were installed.
, Instead of two networks 1A and 1B
Data from one controller to the other
Transmission method. Therefore, the data of the duplex communication apparatus of this embodiment is
The data transmission method will be described. Now, the control device 10
Transmission of data from control unit 20 to control device 20
However, of course, the reverse data transmission is also possible. System
In the control device 10, first, when transmitting, as shown in FIG.
First, the source data having a predetermined length is divided into n pieces of data.
You. n may be even or odd
No. The divided data of 1, 2,..., N is
Via the network 13A and the A-system network 1A in the normal order.
Mari D₁→ D_Two→ D_Three→… → D_nAre transmitted in that order. one
Via the B-system communication device 13A and the B-system network 1B
Therefore, in the reverse order to the A system,_n→
D_n-1,… → D₁Are transmitted in the order of On the other hand, the control device 20 transmits
Block B that stores data of the same length as the data₁, B
_Two, ..., B_nReceiving memory M with_RHaving. This memo
Re M _RMay be provided in the CPU 21 or in the memory 22.
A partial area may be allocated. A network 1A
In the normal order received by the A-system communication device 23A.
D ₁, D_Two, ... are the receiving memory M_RBackward from the front edge of
Memory block B₁, B _Two, ... divided data D
₁, D_Two,... Are sequentially stored. In addition, B system network
1B, the reverse order data received by the B-system communication device 23B.
Data D_n, D_n-1, ... are the reception memory M_RBefore the trailing edge of
Memory block B toward_n, B_n-1Is divided into
Data D_n, D_n-1,... Are sequentially stored. Normal order, reverse
Both transmissions and receptions are performed in normal order, and if n is an even number
In the case of₁, D_Two, ..., D_{n / 2}Is memory
M_RBlock B₁, ..., B_{n / 2}And reciprocal data
Data D _n, D_n-1, ..., D_{n / 2 + 1}Is the memory M_RBlock of
K B_n, B_n-1, ..., B_{n / 2 + 1}When stored in
D₁, D_Two, ..., D_nHas been received and stored
And In this case, the data D₁, D_Two, ..., D_n1
Ends in half the time it takes to transmit everything in the stream
I do. Therefore, high-speed communication can be performed. When n is odd
Has D in the forward order₁, D_Two, ..., D_{(n-1) / 2}And reverse
The order data is D_{(n -1) / 2 + 2}, ..., D_nIs stored,
D_{(n-1) / 2 + 1}Data remains, and the earlier
The series data is stored, and the communication ends. [0013] For some reason, an abnormality occurs in one of the communication lines.
If the sequence A becomes abnormal, for example, if the sequence A becomes abnormal, the data D
₁, D_Two, ... reception memory M_RMemory runs out, but reverse
Order data D_n, D_n-1The memory of ...
At the end, even if no data in the normal order is stored,
Data D_n, D_n-1, ..., D₁What is remembered
Therefore, reliable transmission can be secured without any trouble in communication. [0014] According to the present invention, the data to be transmitted is
Divide into multiple and transmit data in the first communication sequence in normal order
Then, the data is transmitted in the reverse order in the second communication sequence, and
Indicates the data in the normal order from the front end of the memory to the back.
The data is stored in reverse order from the rear end of the memory to the front.
Because it is stored next, communication can always be performed at high speed
In addition, perform reliable communication even in the event of an error
Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a duplex communication device according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a data transmission / reception method in the duplex communication device of the embodiment. [Description of Signs] 1A A-system network 1B B-system network 10, 20 Control device 11, 21 CPU 12, 22 Memory 13A, 23A A-system communication device 13B 23B B-system communication device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 1/22

Claims (1)

(57) [Claim 1] In a duplicated communication device for performing duplicated communication using at least a first communication sequence and a second communication sequence between a first and a second control device, The first control device includes: a data dividing unit that divides data to be transmitted into n pieces; a unit that sends the divided data to the first communication sequence in a normal order; Means for transmitting the divided data in reverse order, wherein the second control device has a reception data storage means having an area for storing data transmitted by being divided into n pieces;
Means for storing data transmitted from the first communication sequence in order from the front end of the storage means toward the rear in the storage means, and data transmitted from the second communication sequence to the storage means, Means for sequentially storing data from a rear end of the storage means toward a front end thereof.