JPH0426598B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a control signal transmission device in a remote monitoring and control device.

B. Summary of the Invention The present invention provides a remote monitoring and control device that transmits control signals between a master station and a slave station, in which the slave station performs a logical product of an auxiliary code and an auxiliary code of the control signal from the master station. By determining whether the control signal is valid or invalid, reliable equipment control can be obtained.

C. Prior Art A remote monitoring and control device transmits control signals from a central master station to slave stations equipped with equipment to control the equipment, and the slave stations transmit control status of the monitoring equipment and measured quantities of the equipment. By transmitting the display signal to the master station, it is possible to centrally manage monitoring and control by the master station or its host computer.

The system configuration using this remote monitoring and control device is as follows:
Various methods are adopted for monitoring and control reliability and cost, and for data transmission between the master station and slave stations, the line configuration of the transmission path (multi-drop, loop, etc.), startup method (random, cyclic transmission, etc.), and Combinations of various methods and formats are adopted, including signal formats (frequency type, pulse type) and error verification methods (verification methods using a single transmission such as parity testing, verification methods using multiple transmissions such as continuous transmission verification, reply verification, etc.) be done.

In electric railways, remote monitoring and control equipment for feeder line equipment, distribution line equipment, etc. has a large number of slave stations installed in each section along the railway, and control signals are transmitted from a central master station serving as a control center to each slave station. The system configuration is such that display signals are transmitted and received from each slave station to the master station.
For signal transmission and reception between the master station and the slave station, a plurality of devices to be controlled within the slave station are grouped, and transmission efficiency is improved by transmitting and receiving signals in groups.

For example, in the feeding power system shown in Figure 6, substations, division stations, and auxiliary division stations are installed along the railway line.
Disconnectors and switches (marked with 〇 or □) in each location that will become a slave station.
) are grouped to be controlled, and control signals are sent in batches from the master station to each group, and the power supply system is controlled in accident areas and construction areas by on/off control of breakers, switches, etc. It also forms a power supply detour circuit in the event of a power outage at the substation. Further, the status (for example, on/off status) of the controlled device in each slave station is transmitted from the slave station to the master station.

FIG. 3 shows a block diagram of the master station of the remote monitoring and control device. The display device 1 displays a system diagram, etc., including the control status of various devices in the slave stations, by switching the display according to the operator's operation. Select and specify. The operator executes control over the specified equipment using switches 3 ₁ , 3n,...
This is done by operating the . For example, if the device is a switch, a pump motor, etc., the execution switch 3 is set to "ON",
Command “off”. The device selection signal from the display device 1 and the control execution signal from the execution switch 3 are taken into the code converter 6 via interfaces 4 and 5, respectively, and the converter 6 converts the device selection signal into a selection signal corresponding to the designated device. , performs conversion to control data. Further, the conversion unit 6 performs signal conversion for displaying display data on the display device 1 from the display data from the slave station side, as will be described later.

The selection control data passed through the code conversion unit 6 is sequentially stored in the control command detection storage unit 7. This stored data is read out in order of priority by the sorting section 8, and the code creation section 9 adds a slave station code, position code, etc. to the data to create transmission data in the desired transmission format. Transmission to the slave station side is performed by the transmitter 12 via the interface 10 and system bus 11.

FIG. 4 shows a conventional slave station configuration. 16 is a control command detection processing section, and 17 is a control output section. The receiving section 12, the control command detection processing section 16, and the control output section 17 constitute a downstream system on the child station side. 18
19 is an input coupling section, 19 is a multiplexer, 20 is a display command detection storage section, 21 is a selection section, 22 is a code creation section, and 13 is a transmission section, and these constitute an uplink system.

The slave station in FIG. 4 executes control of the device based on the received control data. Then, cyclically or in response to a request from the master station, display data of the open/close status of each device and measurement signals is transmitted to the master station.
The master station transfers the data received by the receiving unit 13 to the host computer via the system bus 11, and sequentially stores it in the display content detection storage unit 15 via the interface 14. This stored data is stored in response to requests from the operator, etc. The data is displayed on the display device 1 through the code conversion section 6.

D. Problems to be solved by the invention In conventional remote monitoring and control devices, no matter which method or form is used, control signals change the equipment status on the slave station side, so incorrect control is likely to lead to serious accidents. , therefore, high reliability is required. For example, if a malfunction occurs in the transmission/reception system or signal processing in the supervisory control of a substation, or if there is an operator error, errors may occur in the ``off'' and ``on'' controls of switches, resulting in equipment burnout and personal injury. There is a risk of inviting Therefore, combinations of various methods and formats have traditionally been adopted to improve the reliability of control signal transmission, but this has the disadvantage of complicating the equipment, increasing costs, and increasing the number of error tests, reducing transmission efficiency. I had a problem.

To solve the conventional problems, surplus bits generated in the control signal for reasons described later are assigned to auxiliary codes, and this auxiliary code is configured in a transmission format in which the control code instructs the control equipment whose state is to be changed, and the control code and the auxiliary code are The applicant has proposed a transmission method that determines whether a control signal is correct or not based on logic with an auxiliary code.

This transmission method will be explained with reference to the conventional master station configuration diagram shown in FIG. 3 and the transmission format shown in FIG. To create the control system (downstream) transmission format by the code creation section 9, as shown in FIG.
In addition to this, for example, it is composed of an auxiliary code (4 bits) that specifies the device whose state is to be changed for the remaining bits that produce the result of combining the display system and the number of bits. Figure b shows the transmission format of the display system (upstream system).

Among these, the control data includes the equipment selected on the display device 1 and the execution switch 3 for it.
The control command detection storage unit 7 creates data in combination with the "on" and "off" commands from ₁ to 3n, and the auxiliary code is based on the state of the device selected on the display device 1 and the "on" and "off" commands from the execution switch. The control command detection storage unit 7 creates data by extracting devices whose status has changed from the "off" command. That is, a control code and an auxiliary code are provided for the storage of control signals by the control command detection storage section 7 and the creation of a transmission format by the code creation section 9. This control code is data that indicates the control content of the control equipment in bits, and there are many combinations, such as when it is desired to change the state of only one out of four devices, and when it is desired to change the state of all four devices.
In that case, the auxiliary code is added only to the device specified by the operator on the display device. For example, "enter", "cut", "enter", "enter" are "cut", "kiri",
When specifying "on" and "on", since we specified that the state should be changed only in the first case, we set the auxiliary codes as "1", "0", "0", "0", and asked the operator to change the state in the first case. If the first device is selected and the execution switch is turned off, the execution bit "1011" indicating the old state will be changed to "off" only at the position corresponding to the auxiliary code, and each device in the group will be set to "0011". Use as a control signal.

By transmitting with such an auxiliary code added, the slave station outputs device control only to the device corresponding to the auxiliary code "1", thereby preventing control execution of the 2nd to 4th bits due to a malfunction or disturbance in the transmission system. Even if the signal is erroneous, the auxiliary code is ``1000'', so it will not be executed, and conversely, even if the auxiliary code is erroneous, if there is no error in the control bit, the control will be in the same direction as in the conventional state, so erroneous control will occur. Moreover, since the remaining bits of the control system are used, the transmission system does not become complicated and the transmission efficiency does not decrease.

It is not possible to realize such a function with the conventional slave station configuration shown in FIG. In other words, the signal is output directly to the controlled device via the receiving section 12 shown in FIG. If an erroneous command is written into the control command detection processing section 16 due to noise, erroneous control will continue to be performed, which may lead to personal injury, especially during maintenance inspections.

E Means and operation for solving the problem The present invention was made in view of the above problem, and a plurality of controlled devices on the slave station side are grouped,
The control signal sent from the master station to the slave station is sent to the slave station side in a remote monitoring and control device that combines the control code for each device in the group and the auxiliary code for instructing the state change of each device, and transmits the mixture all at once. The apparatus is provided with means for determining whether the control signal is correct or not by calculating an AND condition between the control code and the auxiliary code of the control signal from the master station.

F Embodiment FIGS. 1 and 2 show the slave station side according to the embodiment of the present invention, and FIG. 1 shows the configuration of the downlink system (control system),
FIG. 2 shows the configuration of the uplink system (display system). In the downlink system, the control command detection processing section 16 determines whether the control command from the master station is for the own station or not. Position code determination unit 16 that determines whether it is a controlled device
b. A position selection section 16c which selects a corresponding position using the detection signal of the own station post designation detection section 16a and the judgment signal of the position code determination section 16b as an AND condition. A control command detection section 16d. The auxiliary code is within the group position. Control to detect whether a control signal is valid or invalid by using the detection signal of the auxiliary code detection unit 16e and the control command detection unit 16d and the auxiliary code signal from the auxiliary code detection unit 16e as an AND condition. It is constituted by a validity detection section 16f. Reference numeral 17 denotes an output circuit that outputs a position code and a control code to a controlled device at a corresponding position.

In the upstream system in Fig. 2, 18 is an input coupling circuit;
Numeral 19 is a multiplexer that recognizes and outputs the device status signals from the input coupling circuit 18 in priority order.
Reference numeral 20 denotes a display command storage unit, which includes a state change signal storage unit 20a for storing the controlled equipment at a position whose state has changed in the group of controlled equipment, and a display signal storage unit 20b for displaying the individual status of the controlled equipment at each position. The display state storage section 20c stores a display signal of , and the display auxiliary code storage section 20d stores an auxiliary code corresponding to a controlled device to be displayed. 21 is a selection section, and a display signal storage section 20b
Among the group of condition change signals from , the condition change signals of the corresponding positions are selected in order of priority.

Reference numeral 22 denotes a code creation section, which is composed of a first display code creation processing section 22a, a second display code creation processing section 22b, and a third display code creation processing section 22c. The first display code creation processing section 22a creates a post code and a position code. The second display code creation processing section 22b is the display state storage section 20
A display code is created according to the storage output signal of c.
The third display code creation processing unit 22c creates an auxiliary code. The signals created by the code creation section 22 are combined by the transmission section 13 and transmitted to the master station, where a predetermined display operation is performed.

On the slave station side with the above configuration, from the master station to the receiving unit 1
2, the post code is detected by the local post designation detecting section 16a, and the detection signal is sent to the position selecting section 16.
guided by c. The position code is determined by the position code determination section 16b, and the determination signal is guided to the position selection section 16c. The position selection unit 16c uses these signals as an AND condition to control and output the position code signal to the output unit 17.
Output to. The control command detection section 16d detects which device in the group the control command signal corresponds to, and the detection signal is guided to the control validity detection section. The auxiliary code detection unit 16e detects which device in the group the auxiliary code corresponds to, and the detection signal is guided to the control validity detection unit 16f. The control validity detection section 16f inputs a control command signal to the control output section 17 using these signals as an AND condition, thereby selecting and operating a corresponding controlled device in a corresponding group position.

In this way, when only the controlled device in the corresponding group position is operated, a signal representing the operating state of the controlled device is transmitted via the input coupling section 18 → multiplexer 19 to the display command storage section 20. The signals of the controlled equipment that are inputted for each group position and whose status has changed are stored in the display signal storage unit 2.
Post code and position code of only the state change signal stored in 0b and selected by the selection unit 21 are created by the code creation unit 22a. Further, the display signal after the state change of each device in the corresponding group position stored in the display state storage unit 20c and each display signal for maintaining the state are created into a predetermined transmission code by the display code creation processing unit 22b, and these are An auxiliary code indicating the detailed display contents of the group position corresponding to the display signal is created by the code creation processing unit 22c, and these post codes, position codes, display codes, and auxiliary codes are sent from the transmitting unit 13 in a predetermined format. It is transmitted to the station side or the upper computer side.

G. Effects of the Invention The present invention is as described above, and is configured so that the slave station obtains an AND condition between the control command detection signal and the auxiliary code detection signal, and finally sends out the control output using this signal and the position selection signal. Since the present invention is configured as a side, there is a low probability that an erroneous control command will be outputted to a plurality of devices within a group, unlike in conventional devices, and a highly reliable signal transmission device can be obtained.

[Brief explanation of drawings]

1 and 2 show a slave station according to an embodiment of the present invention, FIG. 1 is a configuration diagram of the main part of the downlink system, and FIG.
Figure 3 shows the configuration of the main parts of the uplink system, Figure 3 shows the configuration of the master station, Figure 4 shows the configuration of the conventional slave station, and Figure 5 shows the transmission format of the control signal and display signal according to the present invention. The figure shown in FIG. 6 is a system diagram of a feeder line to which the present invention is applied. 16... Control command detection processing unit, 16... Local post designation detection unit, 16b... Position code determination unit, 16c... Position selection unit, 16d...
Control command detection section, 16e... Auxiliary code detection section, 1
6f...Control validity detection section, 17...Output circuit, 1
8...Input coupling circuit, 16...Multiplexer,
20... Display command storage section, 20a... Status change signal storage section, 20b... Display signal storage section, 20c... Display state storage section, 20d... Display auxiliary code storage section,
21...Selection unit, 22...Code creation unit.

Claims (1)

[Scope of Claims] 1. A plurality of devices to be controlled in a slave station are grouped, and a control signal sent from the master station to the slave station includes a control code that instructs control contents for each controlled device in the group in bits; In the remote monitoring and control device, a remote monitoring and control device is provided with an auxiliary code that indicates in bits whether or not control can be executed for each device to be controlled in a group, and controls the devices to be controlled in groups by the control signal, wherein the slave station receives the control signal. The control instruction detection processing section 16 includes a control instruction detection processing section 16 that detects and processes a control instruction that detects which control target device the intra-group control code of the control signal from the master station corresponds to. a detection unit 16d; an auxiliary code detection unit 16e that detects which controlled device the auxiliary code of the control signal from the master station corresponds to; a detection signal of the control command detection unit 16d and the auxiliary code detection unit A signal transmission device for a remote monitoring and control device, comprising: a control validity detection section 16f that detects whether the control signal is valid or invalid by calculating an AND condition with the detection signal of the control signal 16e.