JPH0275242A - Monitor control system for transmission line - Google Patents

Abstract

PURPOSE:To reduce the length of one frame and to decrease the scale of the hardware by decreasing a bit number per station used for the bit multiplex system and providing an area utilized at polling selecting in the frame. CONSTITUTION:A terminal equipment station 1a being a monitor control station, relay stations 2a-2n being a control station to be monitored and a terminal equipment station 1b are provided in the system. The frame information on the transmission line includes a bit multiplex information area and a polling selecting information area. The polling selecting information area is made idle in the normal state where no fault takes place, the transmission line is monitored in the bit multiplex information area and when there arises the necessity giving a control instruction to an individual station or a fault, the polling selecting information area is used to apply detailed information transmission individually to the station. Thus, the frame length is decreased and the hardware is reduced in scale.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is used for information collection and control methods for transmission lines. In particular, it relates to a method for collecting monitoring information and transmitting control commands for relay stations and terminal stations.

〔overview〕

The present invention provides a means for monitoring and controlling a transmission path in which a large number of relay stations are inserted between terminal stations, in which the number of bits per station in a bit multiplexed information area of frame information on the transmission path is set to a small number, and polling and selection are performed on this. By adding a reporting information area, it is possible to grasp general information at all times and to exchange detailed information when necessary, with a short frame length.

[Conventional technology]

Conventional systems use a bit multiplexing method in which monitoring information or control commands for each relay station and terminal station are loaded in assigned positions according to a predetermined frame format, and a specific relay station or terminal station is called out as needed. There was a polling/selecting method in which one-on-one dialogue was carried out.

[Problem that the invention seeks to solve]

However, in the case of the focus multiplexing method, the maximum number of relay stations and 1
Since the frame length is almost proportional to the frame length, even in a configuration with a small number of relay stations, the frame length is equal to the predetermined maximum number of stations, and all bits other than the used layer become surplus bits, making it difficult to transmit information. It has the disadvantage that the time required is the same as when the relay station is at its maximum, and in addition, it requires a longer frame structure than when using the polling/selecting method, and the hardware circuitry required to process the information is large. There is. In addition, if an error occurs on the line, there is a possibility that incorrect information will be processed, resulting in low reliability.

On the other hand, the polling/selecting method requires a smaller hardware circuit than the bit multiplexing method.
If the number of relay stations is relatively small, the time required for information transmission is short, but if the software becomes complex, the number of relay stations is relatively large, and alarms occur frequently at the same time, the focus multiplexing method The drawback is that the information gathering time is longer than in the conventional method, and it is not possible to respond immediately to the occurrence of an alarm.

SUMMARY OF THE INVENTION The present invention aims to eliminate such drawbacks and to provide a transmission line monitoring and control system with a short frame length and small-scale hardware and software.

[Failure to solve the problem]

The present invention is included in an opposing terminal station and a large number of relay stations inserted into a transmission path between these terminal stations, the terminal station has a monitoring control means, and other stations other than this terminal station are monitored. In the transmission line monitoring m1j control system having a control means, the supervisory control means selects a station having the monitored control means from a first area in which a small number of bits are allocated to correspond to a station having the monitored control means. The monitored control means includes a first means for generating frame information including a second area in which a large number of bits are allocated to a station, and the monitored control means generates a value of a bit addressed to the own station in the first area of the incoming frame information. The monitoring control means includes a third means for allocating control information to a second area of the frame information, and the monitored control means The present invention is characterized by comprising a fourth means for allocating information relating to a change in the state of the own station to a second area of frame information.

[Effect]

Frame information on the transmission path includes a bit multiplexing information area and a polling/selecting information area. In normal conditions where no faults occur, the polling/selecting information area is blank, the bit multiplexing information area monitors the transmission path, and in the event of a fault or when it becomes necessary to issue control commands to individual stations. If the station is selected, detailed information is transmitted individually to that station in the poll link selection information area.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 1 is a block configuration diagram showing the overall configuration of this embodiment. FIG. 2 is a block configuration diagram showing the configuration of a terminal station which is a supervisory control station in this embodiment. FIG. 3 is a block diagram showing the configuration of a relay station which is a monitored control station in this embodiment.

First, the configuration of this embodiment will be explained based on FIGS. 1 to 3. In this embodiment, as shown in FIG. 1, a terminal station 1a is a supervisory control station, and a relay station 2a is a monitored control station.
~2n and a terminal station 1b, where the terminal station 1a
comprises a control unit 12 having a cpuio and a supervisory signal control circuit 11, a transmitting circuit 13, and a receiving circuit 14,
Further, each of the relay stations 2a to 2n has a CPU 2a.
and a control section 23 having supervisory signal control circuits 21 and 22.
, a driver 25.26, and a receiver 24.27. That is, in this embodiment, the opposing terminal stations 1a,
1b and a large number of relay stations 2a to 2n inserted in the transmission path between this terminal station, the terminal station 1a has a monitoring control means, and the other stations 1b and 2b to 2n other than this terminal station are The supervisory control means has a first area in which a small number of bits are allocated to stations corresponding to the stations having the monitored control means, and a large number of bits for stations selected from the stations having the monitored control means. The monitored control means includes a control unit 12 having a first means for generating frame information including a second area to which bits are allocated, and a third means for allocating control information to the second area of the frame information. , a second means for changing the value of the bit addressed to the own station in the first area of the incoming frame information depending on whether there is an automatic state change of the own station; and a second means for changing the value of the bit addressed to the own station in the first area of the arrived frame information; The control unit 23 has a fourth means for allocating the information.

Next, the operation of this embodiment will be explained based on FIGS. 1 to 6. Here, FIG. 4 is a flowchart showing the operating procedure of the terminal station 1a, which is the monitoring control station, and FIG. 5 is a flowchart showing the operating procedure of the relay stations 2a to 2n, which are the monitored and controlled stations. FIG. 6 is a format diagram showing the structure of a transmission information frame.

As shown in FIG. 6, the transmission information frame transmitted from the terminal station 1a, passed through the relay stations 2a to 2n and the terminal station 1b, and received again by the terminal station 1b has a frame synchronization period bit area 7 and a bit multiplexed frame. It consists of an information area 8 and a polling/selecting information area 9, where the bit multiplexing information area 8 includes information 1 indicating general information (for example, presence or absence of a failure) of the monitored control station. The polling/selecting information area 9 is assigned with supervisory control information exchanged between the supervisory control station and the monitored control station in a one-on-one correspondence.

Now, in the terminal station 1a which is a supervisory control station, the receiving circuit 14
The monitored control station where the bit value of bit multiplex information area 8 of the transmission information frame received via
When O locates, this CPU], O opens detailed information (for example, detailed failure contents) to this monitored control means in the polling/selecting information area 9 of the transmission information frame via the supervisory signal control circuit 11. Turn aside. Each time this transmission information frame goes around the transmission path, information is exchanged once between the monitored control station and the terminal station 1a. The information exchange is completed by repeating this information exchange a predetermined number of times. If there is an automatic state change in another monitored control station during this period, the CPU 30 of this monitored control station will assign the bit multiplexed information area 8 of the transmission information frame that has arrived at the supervisory signal control circuits 21 and 22 to its own station. When the transmission information frame arrives at the terminal station 1a, the CPUIO identifies the change in status of the monitored control station.

[Effects of the Invention] As explained above, the present invention has the following effects by reducing the number of bits used per one station in the bit multiplexing method and providing an area in the frame that can be used during polling and serenoting. .

1. Since one frame is shorter than when using only bit multiplexing, the scale of the hardware that processes it becomes smaller. For example, for a two-digit number of monitored stations, 2
When the number of bits in a digit is assigned, the number of bits in 3 or 4 digits becomes one frame length in the case of a bit multiplexing method. However, in the present invention, the number of bits in the bit multiplexing information area is two digits, and the number of bits in the hauling selective information area is also two digits, so the frame length, which is the sum of them, is between two digits and three digits less than 200. Therefore, the frame length is shorter than that of the conventional bit multiplexing method.

2. Compared to the case where the bit multiplexing method or the polling/selecting method is used alone, the main information of all stations can be collected even during polling in a shorter cycle time.

3. Compared to the bit multiplexing method when used in a configuration with a small number of relay stations, there are fewer surplus bits and the bits can be used effectively.

4. Information that requires high reliability, such as control commands, can be collected with high reliability and in a short time by using the polling/selecting method.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing the overall configuration of an embodiment of the present invention. FIG. 2 is a block configuration diagram showing the configuration of the supervisory control station of the present invention. FIG. 3 is a block configuration diagram showing the configuration of the monitored control station of the present invention. FIG. 4 is a flow diagram showing the operation of the supervisory control station of the present invention. FIG. 5 is a flow diagram showing the operation of the monitored control station of the present invention. FIG. 6 is a format diagram of frame information used by the present invention. la, lb...terminal station, 2a-2n...relay station, 7
... Frame synchronization bit, bit multiplex information area, 9... Polling/selecting information area, 1
0.20... CPU, 11.21.22... Supervisory signal control circuit, 13... Transmission circuit, 14... Receiving circuit, 24.27... Receiver, 25.26... Driver .

Claims (1)

[Claims] 1. Included in an opposing terminal station and a large number of relay stations inserted in the transmission path between these terminal stations, the terminal station has a monitoring control means, and other terminal stations other than this terminal station In a transmission line supervisory control system in which the station has a monitored control means, the supervisory control means has a first area in which a small number of bits are allocated to correspond to the station having the monitored control means; The monitored control means includes a first means for generating frame information including a second area to which a large number of bits are allocated to a station selected from The supervisory control means includes a second means for changing the value of the bit depending on whether or not there is an automatic state change of the own station, and the monitoring control means includes:
The monitored control means includes a third means for allocating control information to a second area of the frame information, and the monitored control means includes a fourth means for allocating information related to a change in the state of the own station to the second area of the frame information. A transmission line monitoring and control system characterized by: