JPS6326954B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a polling-type train concentration system in which a master station is connected to one or more slave stations, the master station calls the slave stations sequentially, and the slave stations send display codes to the master station. Regarding a control device.

Conventionally, in this type of train centralized control system, as shown in Figure 1, a master station sends a slave station designation code to call a specific slave station, and the slave station calls all the displays it owns. The information is transmitted as a display code to the master station, and when the master station completes receiving the display code from this slave station, it calls the next slave station and receives the same display code, and then receives the display code from the final slave station. When the reception was finished, it returned to the first slave station and repeated the same operation.

However, this conventional train centralized control system has the drawback that the cycle time becomes longer as the number of pieces of information for each slave station increases, and the transmission of necessary information such as information that has caused a state change is delayed. In order to compensate for this drawback, measures have been taken to increase the transmission speed, but there are limits to increasing the transmission speed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a train centralized control device that can shorten cycle time and quickly transmit necessary information.

In order to achieve this object, the present invention provides the above-mentioned polling-type train centralized control system that includes information that has changed within a designated interval (one cycle) when sending a display code from a slave station. It is characterized by transmitting only the display code to the master station.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The content of the present invention will be specifically described below with reference to the accompanying drawings, which are examples. FIG. 2A is a diagram showing the transmission/reception relationship of codes between the master station and slave stations of the train centralized control device according to the present invention, and FIG. 2B is a diagram showing the contents of the codes.

First, a slave station designation code is sent from the master station to the slave station. The content of the slave station designation code is a code that includes the slave station number of the slave station to be called and information for requesting all display codes. The full display code request is made when the master station does not send the full display code because the gist of the present invention is to not send the full display code all the time, but only to transmit necessary display codes such as information that has caused a status change. This is provided as a means of use when necessary.

The slave station specified by the slave station specification code basically sends out an answer code and a display code.If there is no display code to send, that is, if there is no information that has caused a state change within one cycle, it will send an answer code and a display code. Send only the code. The answer code consists of at least a slave station number and the number of display codes to be transmitted. The number of display codes represents the number of display codes sent following this answer code,
If there is no display code to send, it is expressed as "0".

The display code consists of at least a display code number and a plurality of display information bits. Regarding the display codes to be sent, when all display codes are requested by the slave station specification code from the master station, all display codes of the own station are sent, but when there is no request for all display codes, the display codes specified by the own station are sent. Only display codes that include information that has changed within one cycle from when the code is specified until the next specification are sent out.

When the master station completes receiving the answer code and display code transmitted by the slave station, it transmits the display answer code. The display answer code is a code sent for the purpose of informing the slave station whether the display code from the slave station has been successfully received by the master station, and is composed of the slave station number, display code reception OK/NG information, etc.

Normally, a slave station only sends out a display code that includes information whose status has changed within one cycle, so if this display code is reliably received by the master station, no new information changes will occur in the next cycle. There is no need to send a display code. Therefore,
It is a necessary condition for the slave station to know whether the display code has been received normally by the master station, and if the display code is not received normally, the slave station must transmit the same display code again in the next cycle. be.

The slave station that has received the display answer code determines whether it is necessary to retransmit the display code based on the display code reception OK/NG information, and completes the transmission operation of the current cycle. When the master station completes the code transmission and reception with the first slave station, it sequentially designates the second slave station, the third slave station, and so on. After completing the transmission and reception with the final slave station, the mobile station returns to the first slave station and repeats the same operation.

Next, the train centralized control system according to the present invention will be explained in more detail with reference to the block diagrams of FIGS. 3 and 4. FIG. 3 is a block diagram of the master station, and the part A surrounded by the chain line is the display answer code generation circuit added in the present invention. The rest are general block diagrams of conventional train central control systems. The display answer code generation circuit 1 includes a display code number storage circuit 1, a display code number counting circuit 2, a comparison circuit 3, and a code generation circuit 4. When the answer code from the slave station is taken into the display answer code generation circuit 1 through the receiving circuit 5, the number of display codes in the answer code is stored in the display code number storage circuit 1. On the other hand, the receiving circuit 5
The output of is also given to the verification circuit 6, which verifies whether the received answer code is the answer code of the slave station currently being called. When the verification is passed, the number of display codes is counted by the display code number counting circuit 2, and the comparison circuit 3 compares this counted value with the number of received display codes stored in the display code number storage circuit 1. to confirm receipt of the full display code,
A display answer code is created by the code creation circuit 4. The display answer code created by the code creation circuit 4 is sent to the corresponding slave station via the cycle control circuit 8 and transmission circuit 9, which transmit the control code created by the control information creation circuit 7 and the slave station designation code. Sent out. Note that 10 is a display memory circuit, and the output of this display memory circuit 10 lights up indicator lights and the like.

FIG. 4 is a block diagram of each slave station, in which the part (b) surrounded by a dashed line is an answer code generation circuit, and the part (c) is a display code storage circuit. The configuration of the other parts except for the above-mentioned answer code generation circuit (b) and display code storage circuit (c) is a conventional general configuration.

Answer code creation circuit B is code creation circuit 1
1 and a change flag number counting circuit 12, etc.
In addition, the display code storage circuit C is the display information input circuit 1.
3, a display information storage circuit 14, a display answer receiving circuit 15, a comparison circuit 16, and the like.

The display information input to the display information input circuit 13 is collected into display code units by the input circuit 13, and is input to and stored in the storage circuit 14 at regular intervals. During storage, a comparison circuit 16 compares the already stored content and the newly stored content, and if there is a mismatch between the two, a change flag is stored in the storage circuit 14 together with the newly stored content.
Furthermore, each time a change flag is stored, the number is counted by a change flag number counting circuit 12 provided in the answer code generation circuit B.

If the slave station designation code from the master station received by the receiving circuit 17 is the designation code for the own station, the answer code generation circuit B calculates the own station number and the change flag number counting circuit 12 in advance. With the structure of the number of display codes using the number of change flags as information, an answer code is sent out, and subsequently a display code with a change flag stored in the storage circuit 14 is sent out. These answer codes and display codes are sent to the transmission control circuit 17.
and is transmitted to the master station via the transmitting circuit 18.

When the transmission of the answer code and display code is completed, it waits for reception of the display answer code from the master station. The display answer code sent from the master station is received by the display answer receiving circuit 15 via the receiving circuit 17, and its contents are decoded. Then, when the content of the display answer code indicates that the display code has been normally received at the master station, a flag erasing signal from the display answer receiving circuit 15 causes the storage circuit 14 to clear all change flag storage. Erase and end the sending operation. When the content of the display answer code indicates that the display answer code was not received normally, the transmission operation is ended without erasing the change flag memory in the storage circuit 14. If it is not received normally, it will be retransmitted in the next cycle.
At each slave station, from reception of the slave station designation code to reception of the display answer code and completion of transmission,
New storage of display information is stopped, and new storage of display information is restarted after the transmission operation is completed. In addition, 2
0 is a control storage circuit, and 21 is a verification circuit.

As described above, in a polling-type train central control device, when a slave station sends out a display code, the present invention sends only the display code containing information that has changed within a designated interval to the master station. Since the present invention is characterized by transmission, it is possible to provide a train centralized control device that can significantly shorten the cycle time for transmitting display codes and quickly transmit necessary information.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the operation of a conventional train central control device, FIG. 2A is a diagram explaining the operation of the train central control device according to the present invention, FIG. 3 is a block diagram of the master station, and FIG. 4 is a block diagram of the slave station. B...Display answer code creation circuit, B...Answer code creation circuit, C...Display code storage circuit.

Claims (1)

[Claims] 1. In a train central control system that connects a master station and one or more slave stations, sends a slave station designation code from the master station, and sends a display code from the corresponding slave station, a display answer code creation circuit is installed in the master station. The slave station is equipped with an answer code creation circuit and a display code storage circuit, and in response to the slave station designation code from the master station, only the answer code and a display code containing display information changed within one cycle are sent from the corresponding slave station. Basically, the master station sends a display answer code to tell the slave station whether or not reception was successful, and the slave station receives the display answer code and transmits the display code to the master station normally. If it is transmitted normally, only the display code that includes the information that has changed during the next cycle is sent, and if it is not transmitted normally, the display code that contains the information that has changed during the next cycle is sent. A train centralized control device characterized in that a display code that could not be transmitted in the current cycle is retransmitted together with a display code that includes information that has been transmitted.