JP2000228671A - Communication method for autonomous distributed network and ethernet(r) - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform communication between an autonomous distributed network and Ethernet(R) and to eliminate the need of the repair work of a system even at the time of increasing/decreasing terminals. SOLUTION: At the time of transmitting and receiving data between the plural Ethernet(R) and the autonomous distributed network for mutually connecting each Ethernet(R), a function code is added to the data corresponding to a data kind (ST1) and the data are transmitted by a standard broadcast procedure in each of the Ethernet(R) (ST2). In an interface device between each of the Ethernet(R) and the autonomous distributed network, the conversion of the data to autonomous distributed network frames is executed and the data are sent out to the autonomous distributed network (ST3 and ST4). In the meantime, in each of the Ethernet(R) on a data reception side, in the interface, the conversion of the data to Ethernet(R) frames is executed (ST5 and ST6) and whether or not to fetch the data into the Ethernet(R) is simultaneously decided by the function code (ST7 and ST8).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication method between an autonomous decentralized network and an Ethernet, and more particularly to a method for interconnecting Ethernets built in a plurality of stations and a central command room that supervises the stations, and each Ethernet. The present invention relates to a communication method for transmitting and receiving data to and from an autonomous distributed network as a control system network.

[0002]

2. Description of the Related Art Generally, a control network is used to connect a plurality of Ethernets to each other, and a gateway and a special interface device are installed between the control network and each Ethernet. And
When data transmitted from one Ethernet is received by another Ethernet, whether or not to receive the data is determined by an address part unique to each network provided in the header part of the frame.

[0003] However, a distributed operation management system conventionally used as a station system does not have a network configuration, and a frame format of an autonomous decentralized network which is a control system network connecting the station systems does not have a network configuration. The address configuration does not include the devices connected to the Ethernet which is the system network. That is, the conventional autonomous decentralized network frame format cannot connect to the station system Ethernet.

[0004]

As a future station system, the construction of a station network in which a control controller (computer), a general-purpose personal computer, and the like are connected by a general-purpose Ethernet is expected to be promising. The central system in the central command room is also required to connect a control computer, a general-purpose personal computer, a server, and the like with general-purpose Ethernet.

However, in the prior art, since the frame format of the autonomous decentralized network cannot be connected to the Ethernet of the station system as described above, data transmission / reception between the station systems connected to the Ethernet and between each station system and the central system is not possible. There is a problem that can not be done.

Further, according to the conventional technology, when the number of terminals connected to the network is increased or decreased,
In the address management units of all the devices connected to the network, processing such as addition or deletion of the network address of the other party is required, and there is a problem that the processing work is troublesome.

An object of the present invention is to provide a communication method which enables data transmission and reception between an autonomous decentralized network and Ethernet, and does not require a system repair work even if the number of terminals is increased or decreased.

[0008]

In order to solve the above-mentioned problems, the present invention provides an Ethernet constructed in a plurality of distributed management systems and a control system network for interconnecting the Ethernets. When transmitting and receiving data to and from the autonomous distributed network, each Ethernet transmits data in a standard broadcast procedure, and the interface device provided between each Ethernet and the autonomous distributed network, While transmitting data to the autonomous decentralized network by performing the conversion to the autonomous decentralized network frame, while performing conversion of the data into an Ethernet frame at the interface device on each Ethernet receiving the data, Whether to take the data into the Ethernet Is to determine the data type.

Further, in the present invention, a function code is added to data transmitted from each of the Ethernets according to a data type, and each of the Ethernets receiving the data fetches the data into the Ethernet. Is determined by the function code.

According to the present invention, when data is transmitted from a device on one Ethernet to a device on another Ethernet, the data is all transmitted by broadcast. Then, a function code indicating a data type is added to the application data portion of the transmission frame, and a device to receive the data is determined based on the data type. In the interface device provided between the autonomous decentralized network and the Ethernet, the broadcast frame received from the Ethernet is
The broadcast frame is converted into a broadcast frame for autonomous distribution and transmitted to the autonomous distributed network. The autonomous distributed broadcast frame received by the interface device on the receiving side flows on the autonomous distributed network as it is, is converted into the Ethernet frame, and is broadcast-transmitted on the Ethernet. Each device connected to the Ethernet checks the function code in the application data of the received frame and determines whether to take in the frame.

According to the present invention, the Ethernet is an Ethernet built in a plurality of stations and a central command room that supervises the stations.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a distributed operation management system to which the communication method of the present invention is applied. As shown in FIG. 1, an MCU (Main Control Unit) 1 indicated by reference numeral 101 and an MCU 2 indicated by reference numeral 102 are provided in a central Ethernet which is a network of the central system, and the MCUs are duplicated. Further, duplex man-machine devices 103 and 104, a printer 105, and a file device 106 are connected to the central Ethernet.

The MCU1 and MCU2 are control computers for the central system, and are responsible for the overall control and management of the train operation schedule, management of the results of tracking the train running position performed at each station, transmission of instructions from the central commander, and the like. ing. The man-machine devices 103 and 104 are devices for interfacing with the commander, and execute the display of the train operation schedule of the day, the correction input thereof, the display of the train location, the status display of each device, and the like.
The printer 105 prints journal data and the like indicating the operation state of each computer in accordance with instructions from the man-machine devices 103 and 104. The file device 106 stores the above-described journal data, operation histories of the man-machine devices 103 and 104, and the like.

A station Ethernet is built in each station system. The station Ethernet built at Station A has a CPU (Central Processing Unit) 111.
it) 1 and a CPU 2 indicated by reference numeral 112 are provided,
The CPU is duplicated. In addition, the station Ethernet includes a broadcast control device 113 and a CTC I / F (Centra
l Train Controller Interface) device 114 is connected.

The CPU 1 and the CPU 2 are control computers for the station A system. The CPU 1 and the CPU 2 track the running positions of the trains located in the station A, and transmit the data to other stations or the center, or based on the schedule. For example, train route planning. The broadcast control device 113 issues a timing of an approaching broadcast, an arrival broadcast, a departure broadcast, a delayed broadcast, and the like, and a broadcast text instruction to a broadcast device (not shown) based on the running position of the train. The CTCI / F device 114 receives a position of a train at each station, a traffic light, and a state of a switchgear from a not-shown CTC device, transmits the data to the CPU1 and the CPU2 of the station, and transmits the data to the CPU1 and the CPU2. And the control signals of the switch and the switch are output to the CTC device.

A station Ethernet similar to that described above is also constructed at station B.
A CPU (Central Processing Unit) 1 and a CPU 2 indicated by reference numeral 122 are provided, and the CPU is duplicated. The station Ethernet includes a broadcast control device 123 and a CTC I / F (Central Train Control).
roller Interface) device 124 is connected.

The above-mentioned central Ethernet, station A Ethernet, and station B Ethernet are connected to an autonomous decentralized network. That is, the central Ethernet is connected to the autonomous decentralized network via the interface device 131, the Ethernet at station A via the interface device 132, and the Ethernet at station B via the interface device 133. The interface devices 131, 132, and 134 transmit broadcast data on the Ethernet of each station to the autonomous distributed network, and conversely, broadcast data on the autonomous distributed network to the Ethernet of each station.

Although FIG. 1 shows only two station Ethernets, there are usually three or more station Ethernets, and each station Ethernet is connected to the autonomous decentralized network via the same interface device as described above. It is connected.

FIG. 2 shows a transmission frame format. FIG. 2A shows a transmission frame format on an autonomous decentralized network for connecting stations, and FIG. 2B shows a transmission frame format on a central Ethernet and a station Ethernet. Each format is shown.

The transmission frame format on the autonomous distributed network is based on the autonomous distributed network header 15
1, function code 152, data management unit 153
And a data section 154. The transmission frame format on the central Ethernet and the station Ethernet includes an Ethernet header 155, a function code 152, a data management unit 153, and a data unit 154.

The autonomous distributed network header section 151 is a transmission header section in the autonomous distributed network and includes information such as a destination address and a source address. The function code 152 is a function code of application data, and indicates a type of each data. The data management unit 153 is a data management unit for application data, and includes a transmission source device number, application data length, creation time, and the like. The data section 154 is actual data. Also, the Ethernet header 15
Reference numeral 5 denotes a transmission header section in the Ethernet, which includes information such as a transmission destination address and a transmission source address.

Next, the function code will be described. Table 1 shows an example of the function code. For example, the function change (30) file change and opening / closing data, (32) mode switching data, and (3C) diagram data include the central MCU1, MC3
It is transmitted from U2 to CPU1 and CPU2 of each station. On-rail train information indicating the on-rail position of the train of (50) is:
From the CPU1 and CPU2 at each station, the central MCU1,
It is transmitted to MCU2, CPU1 and CPU2 of other stations. Further, the failure information is displayed on the central man-machine device, and when a failure occurs, it is transmitted from the failed device to the central man-machine device.

[0023]

[Table 1]

The autonomous distributed network header section 151,
Although the transmission destination address is included in both the Ethernet header section 155, in this transmission, it is assumed that all data is transmitted as broadcast data without any awareness at the transmission source. For example, when the MCU 1 transmits file change data, it is performed according to the procedure shown in FIG.

The MCU 1 creates file change data according to the Ethernet transmission frame format shown in FIG. 2, but adds (30) to the function code 152 according to Table 1 (ST1). Then, the created transmission frame is broadcast-transmitted on the central Ethernet (ST2). Upon receiving the broadcast data, the interface device 131 of the central system removes the Ethernet header of the frame, adds the autonomous distributed network header 151 shown in FIG. 2 (ST3), and broadcasts the broadcast over the autonomous distributed network. (ST4). When an autonomous distributed transmission frame is created from an Ethernet transmission frame, no change is made to the application data section.

Interface devices 132 and 133 at each station
Receives the broadcast frame on the autonomous decentralized network and broadcasts it to the adjacent interface device as it is (ST5). At the same time, the autonomous distributed network header 151 of the received autonomous distributed transmission frame is removed, and the Ethernet header 15
After adding 5 (ST6) to make an Ethernet transmission frame, it broadcast-transmits it on its own station Ethernet (ST7). When converting from the autonomous distributed transmission frame to the Ethernet transmission frame, no change is made to the application data section.

The CPU 1 of the station (reference numerals 111 and 12)
1) The CPU 2 (reference numerals 112 and 122) checks the value of the function code of the received broadcast Ethernet transmission frame, recognizes that the data is (30), and thus recognizes that the data is file change data, and changes the file according to the data contents. The process is performed (ST7). At this time, the broadcast control device 1 connected to the same Ethernet
13, 123, CTC I / F devices 114, 124
It recognizes from the value of the function code that it is not the data it should receive, and discards the frame.

In the above embodiment, the Ethernet and the autonomous distributed network constructed between the station system and the central system have been described. However, the communication method of the present invention is constructed in another system, for example, a power plant. Of course, the present invention can also be applied to a system in which the connected Ethernet is connected to the Ethernet of another power plant via an autonomous decentralized network.

[0029]

As described above, according to the present invention,
By using the funk code indicating the data type of the application data and using the broadcast, data transmission / reception between the autonomous distributed network and the Ethernet can be realized.

Further, all data to be transmitted to other stations is transmitted as broadcast data, and whether to receive data depends on the value of the function code indicating the data type. Even if a station Ethernet system is added as a whole due to the addition of a station, or if a device connected on the Ethernet of a certain station is added, the added Modification work to the conventional system such as addition of a network address becomes unnecessary. Similarly, even when a station system or a device connected to the station system is removed due to the system reduction, the present invention can be implemented without affecting other systems.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a distributed operation management system.

FIGS. 2A and 2B show an example of a transmission frame format, in which FIG. 2A shows a transmission frame format on an autonomous distributed network, and FIG. 2B shows a transmission frame format on Ethernet.

FIG. 3 shows an example of a communication method according to the present invention, and is a flowchart in the case of transmitting file change data.

[Explanation of symbols]

 101 Computer for Control of Central System (MCU1) 102 Computer for Control of Central System (MCU2) 103, 104 Man-Machine Device 105 Printer 106 File Device 111, 121 Computer for Station System (CPU1) 112, 122 Computer for Station System (CPU2) 113, 123 Broadcast control device 114, 124 CTC I / F device 131, 132, 133 Interface device 151 Autonomous decentralized network header section 152 Function code 153 Data management section 154 Data section 155 Ethernet header section

Claims (3)

[Claims] When transmitting and receiving data between an Ethernet constructed in a plurality of distributed management systems and an autonomous distributed network as a control system network for interconnecting the Ethernets, Each Ethernet transmits data by a standard broadcast procedure, and an interface device provided between each Ethernet and the autonomous distributed network,
While converting the data into an autonomous distributed network frame and sending the data to the autonomous distributed network, each Ethernet receiving the data converts the data into an Ethernet frame at an interface device. And a method for communicating between the autonomous decentralized network and the Ethernet, wherein whether or not the data is taken into the Ethernet is determined according to a data type. 2. The communication method according to claim 1, wherein a function code is added to data transmitted from each of the Ethernets in accordance with a data type, and each of the Ethernets on the receiving side receives the data. A method for determining whether or not to incorporate the data into the Ethernet by the function code. 3. The communication method according to claim 1, wherein the Ethernet is an Ethernet built in a plurality of stations and a central command room that supervises the stations. Method.