JPH0431631B2 - - 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 method in which a plurality of devices to be controlled in a slave station are grouped, and a master station transmits a control code for controlling the devices in group units and an auxiliary code instructing whether or not to execute the control to the slave station; In a remote monitoring and control device, the slave station sends equipment status codes indicating the on/off status of each equipment to the master station. By testing the presence or absence of errors in the control signal based on the logical state of the control code and equipment status code at the time of transmission after storing the control code, control during generation, storage, and transmission of the control code is performed. This system detects signal errors and prevents erroneous control.

C. Prior Art A remote monitoring and control device transmits a control signal from a central master station to a slave station equipped with equipment to control the equipment, and the slave station sends a display signal indicating the on/off state of the monitoring equipment. is transmitted to the master station to enable centralized management of 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 reliability and cost of monitoring and control, 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, such as signal formats (frequency type, pulse type) and error verification methods (verification methods using a single transmission such as parity testing, and verification methods using multiple transmissions such as continuous transmission verification and reply verification). 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 sent from the master station, which serves as a central command center, to each slave station. This results in a system configuration in which display signals are 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 system shown in Figure 5, 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 transmitted in batches from the master station in groups, and power is supplied to the accident zone or construction zone by on/off control of breakers, switches, etc. It will be disconnected from the grid, and a power supply detour will be created in the event of a power outage at the substation. Also,
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 conventional master station configuration diagram of a remote monitoring and control device for electric railways. The display device 1 switches and displays a system diagram, etc., including the control status of various devices in the slave stations, according to the operator's operations, and the operator selects the device in the device group that requires control from the displayed diagram using a light pen. Select and specify using 2nd grade. The operator executes the control to specify the ON/OFF state for the specified equipment using the switches 3 ₁ , 3 _o ,
This is done by operating... For example, if the device is a switch,
In the case of a power cutter, etc., the execution switch 3 is turned on,
Command “off”. The device selection signal in the device group by the display device 1 and the control execution signal by the execution switch 3 are respectively taken into the code conversion unit 6 via the interfaces 4 and 5, and the conversion unit 6 converts the device selection control signal into Performs selection and conversion to control signals corresponding to the specified equipment. Also,
The selection unit 6 converts display data from the slave station side into data for display on the display device 1, 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 slave station addresses, group position codes, etc. to the data to create transmission data in the desired transmission format. , interface 10, and system bus 11, the transmitter 12 performs transmission to the slave station side.

A slave station (not shown) controls the device based on the received control data. Then, when the state changes, cyclically, or in response to a request from the master station, display data of the on/off state of each device 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 the data 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, various methods and combinations of formats have been used to improve the reliability of control signal transmission, but all of them focus on preventing errors in transmission, so it is difficult to transmit erroneous control signals on the transmitting side. Once created, a verification code for preventing transmission errors is added to the erroneous control signal, but this does not provide true error control prevention.

In order to solve the conventional problems, the control signal is provided with an auxiliary code in addition to the control code that instructs the content of the control, and this auxiliary code is used to instruct whether or not the device to be controlled by the control code can be executed. The applicant has proposed a transmission method that prevents erroneous control based on the logical states of control codes and auxiliary codes.

This specific method will be explained using the transmission formats of the control system (downstream system) a and the display system (upstream system) b illustrated in FIG. This figure shows a case where a plurality of devices to be controlled in a slave station, such as a remote monitoring and control device for a feeder line system shown in FIG. 5, are grouped and controlled in units of groups by control signals. Further, control signals will be explained using random transmission (that is, a method in which they are not transmitted during normal times, and are transmitted only when the control system executes control and when the display system changes state) as an example.

To create the control system (downlink) transmission format by the code creation section 9, the station to which the control equipment belongs (for example, the substation in Figure 5) is specified using the synchronization signal, station address, etc. as shown in Figure 4a. , the group position (for example, the four feeding shields and disconnectors in the substation shown in Figure 5) is specified all at once, and the control data is in addition to the control code (4 bits) for each of the four control devices grouped. It consists of an auxiliary code (4 bits) that specifies whether the device can be controlled. Figure b shows the transmission format of the display system (upstream system), and the intra-group display code is an equipment status code that indicates the on/off state of the equipment.

Among these, the control code is the device selected on the display device 1 and the execution switch 3 ₁ for it.
~ ₃ The control command detection storage unit 7 creates data in combination with the "on" and "off" commands from o, and the auxiliary codes are "on" and "off" commands from the execution switch for the device selected on the display device 1. The control command detection storage unit 7 creates data by extracting the equipment to be controlled from the command. In other words, 1 out of 4 devices
There are many combinations, such as when you want to change the state of only one, or when you want to change the state of all four. In this case, the auxiliary code specifies executable only for the control execution device specified by the operator on the display device. For example, turning each device in a group on or off,
“On”, “in” things are “off”, “off”, “in”, “in”
When issuing an execution command, the control code is "0", "0",
"1", "1", and the auxiliary codes are "1", "0",
It is set to "0" and "0" to control the on/off state of the first device to the off state, and instructs other devices not to execute the control.

By transmitting with such an auxiliary code added, the slave station outputs device control based on control data only to the equipment corresponding to the auxiliary code "1", thereby preventing malfunctions or disturbances in the transmission system from causing damage to the second to fourth bits. Even if the control signal is incorrect, since the auxiliary code is "1000", it will not be executed and will not result in erroneous control. Conversely, even if the auxiliary code erroneously changes from "0" to "1", if there is no error in the control bit, the control will be in the same direction as in the conventional state, so there will be no erroneous control; similarly, the auxiliary code will change from "1" to "1". 0'' by mistake, it will not be executed and will not result in erroneous control.

However, when generating control codes and auxiliary codes on the master station side, control codes and
There is a risk that the auxiliary code may be created incorrectly. Also,
If an incorrect memorization occurs due to reception of the device status signal transmitted from the slave station, disturbance during transmission during storage processing, erroneous writing to the storage memory, program runaway, etc., a new There is a problem in that errors occur in the generation of control signals, resulting in incorrect equipment control.

SUMMARY OF THE INVENTION An object of the present invention is to provide a signal transmission device that prevents errors from occurring during the generation and storage of control signals on the master station side and during the transmission thereof.

E. Means for Solving the Problems The present invention provides a system in which a plurality of devices to be controlled in a slave station are grouped, and a control signal sent from a master station to a slave station is configured such that the control contents are transmitted in bits for each device to be controlled in the group. Controlling the controlled devices in groups by having a control code for instructing and an auxiliary code bit for instructing whether or not to execute control for each controlled device,
In a remote monitoring and control device that transmits a device status code indicating the on/off state of the controlled device from the slave station to the master station, the auxiliary code indicates whether the controlled device is executable when generating and storing the control signal. a control signal storage section that stores execution details of the control signal for each device only when an instruction is given, and updates and stores the contents of the device status code for each device when transmitting the control signal to a slave station; An exclusive OR circuit that determines whether the stored content and the device status code match or do not match for each device; and an indicator that displays an error in the control signal based on the mismatch output of the exclusive OR circuit. Features.

F Function When generating and storing control codes, the execution contents are stored only for devices for which the auxiliary code indicates executable,
The presence or absence of an error during generation and storage of the control code is verified by determining whether or not the stored content matches the equipment status code. When the control code is transmitted, the contents of the control signal storage section are updated and stored with the equipment status code. The presence or absence of errors in the storage of control codes is verified by determining whether the stored contents match or do not match the equipment status code.

G. Embodiment FIG. 1 is a block diagram of a master station showing an embodiment of the present invention. The difference between this figure and FIG. 3 is that the determination unit 16
and a display section 17 for displaying the determination results. The determination unit 16 determines for each device whether the control code matches or mismatches the status display code of the device stored in the display content detection storage unit 15 when the control command detection storage unit 7 generates and stores the control signal, and controls the device. Determine whether there is an error in the signal. Furthermore, the determining unit 16 determines for each device whether there is a change in the control code and the status code of each device by the time a new control signal is generated and transmitted, and whether an error has occurred in the stored contents of the control code. Determine whether or not. The display unit 17 that displays these determination results informs the operator M of the normality or abnormality of the control signal generation processing system and the memory of the equipment status, and checks whether the correct control signal has been generated and whether the correct control signal is stored. Display whether or not. When there is a large amount of display content, this content is sent to the code converter 6 via the interface 4 and displayed on the display device 1, but for convenience of explanation, it is displayed singly as shown in FIG.

FIG. 2 shows a specific example of a part of the control command detection storage section 7, the determination section 16, and the display 17. In the figure, signal I ₁
~ _I4 is each bit signal of the equipment status code stored and updated in the display content detection storage section 15, and the signals _D1 ~
_D4 is each bit signal of the auxiliary code generated and stored in the control command detection storage section 7. Each bit signal _I1 to _I4 of the device status code is connected to a device status display lamp ₁₇₁ , respectively.
~17 Displayed in ₄ . Further, each bit signal _I1 to _I4 of the equipment status code is input to AND gates ₇₅ to ₇₈ , respectively, and the equipment status code control code transfer command given as a common gate to each AND gate ₇₅ to ₇₈ . The signals are latched into the control signal storage units 7 ₁₃ to 7 ₁₆ via the OR gates 7 ₈ to _{7 12} at the timing (corresponding to the time when the device status display is received). On the other hand, the signals D ₁ ~ _{D 4}
corresponds to each bit of the control auxiliary code described above, and is input to the AND gates ₇₁₇ to ₇₂₀ , respectively, and is given as a common gate to each AND gate ₇₁₇ to ₇₂₀ , and is a control code generated during control execution. These signals are taken out at the timing of the storage command, and these signals are taken out at the timing of the control execution content given as a common gate in the AND gates ₇₁ to ₇₄ , respectively, and are sent to the control signal storage section ₇₁₃ via the OR gates ₇₉ to ₇₁₂ . _-716 inputs, and the contents of the control code (cut signal) are latched only for those with bit "1". Each bit I ₁ to _{I 4} of the equipment status code and each latch output of the control signal storage units 7 ₁₃ to 7 ₁₆ are judged to match or not by exclusive OR circuits 16 ₁ to 16 ₄ , respectively. The determination signals are provided for display on control command device status display mismatch display lamps 17 ₅ to 17 ₈ , respectively.

With this configuration, the display lamps 17 ₁ to 17 ₄
The current device status, ie, "on" or "off" status, is displayed by turning on or off. The control code stored in the control command detection storage section 7 becomes each bit of the control signal storage sections ₇₁₃ to ₇₁₆ . Exclusive OR circuits 16 ₁ to 16 ₄ display whether or not the stored contents match the device status code for each device. This display makes it clear that the stored contents of the device status code and the stored contents of the control code have changed due to some kind of failure. In particular, when the operator selects a target device to which a control command is to be issued, this discrepancy becomes more clearly apparent since it should not exist in the first place. Since the state of the device to be controlled does not match the control code until the response display is received after execution of the control, only the device to be controlled is lit, and it becomes clear that the execution content is correct.
As a result, the display lamps 17 ₅ to 17 ₈ indicate whether there is an abnormality in the generation and storage of the auxiliary code and the control code, or whether there is an abnormality in the reception and storage of the status code of the control device. Prove.

That is, when executing control, only the target device is selected using each bit signal D ₁ to _{D 4} of the auxiliary code, and the content of control execution is stored in the control signal storage section 7 according to the control signal storage command.
₁₃ to ₇₁₆ , and _the exclusive OR circuits 161 to 164 determine whether the device status codes _{I1 to I4} have changed in the stored contents of the control codes until the next control signal storage command is given. displayed for each device. This display is particularly useful when selecting new control to check whether data has been destroyed due to data corruption in the storage unit 15 or runaway of the processing means before changing from the previous control state to the current new control state. Monitoring is performed to check whether there is an abnormality in the signal storage of the device control state itself, and to determine whether an abnormality has occurred due to an abnormality in the storage of the control signal generation or storage.

H. Effects of the Invention As described above, according to the present invention, in a transmission device that generates a control signal having an auxiliary code in addition to a control code and transmits it all at once in a group, when generating the control code, the control code and the slave station side The presence or absence of an error in the control code is verified based on the match or mismatch between the equipment status code and the equipment status code received from the equipment status code, and furthermore, when the control code is transmitted, the stored data of the control code is not destroyed based on the storage contents of the equipment status code and the control code. In order to monitor this, we verify errors in the control signal generation processing system due to operator errors or malfunctions of the signal generation circuit, and also monitor stored data of equipment status to prevent incorrect control due to destruction and improve reliability. This has the effect of allowing a high degree of control over the sexes.

[Brief explanation of drawings]

FIG. 1 is a master station configuration diagram showing an embodiment of the present invention;
FIG. 2 is a circuit diagram showing a specific example of the control command detection storage section 7, determination section 16, and display section 17 in FIG.
FIG. 3 is a diagram showing the configuration of a conventional master station, FIG. 4 is a diagram showing the transmission format of control signals and display signals according to the present invention, and FIG. 5 is a system diagram of feeder lines. 1...Display device, 2...Light pen, 3 ₁ ,
3 _o ...Execution switch, 6... Code conversion section, 7... Control command detection storage section, 7 ₁₃ , 7 ₁₆ ... Control signal storage section,
8...Selection unit, 9...Code creation unit, 12...Transmission unit, 1
3... Receiving unit, 15... Display content detection storage unit, 16...
Judgment section, 17...Display section, ₁₆₁ , ₁₆₄ ...Exclusive OR circuit, ₁₇₁ , ₁₇₈ ...Display lamp.

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 indicates control content in bits for each device to be controlled in the group, and a corresponding control signal. Control target devices are controlled in groups by having an auxiliary code that indicates in bits whether control can be executed for each controlled device, and a device status code indicating the on/off state of the controlled device is transmitted from the slave station to the master station. In the remote monitoring and control device that transmits the control signal to a slave station, when the control signal is generated and stored, the execution content of the control signal is stored for each device only when the auxiliary code indicates that the control target device can execute the control signal, and the control signal is transmitted to the slave station. a control signal storage section that updates and stores the contents of the device status code for each device when transmitting to the device; and an exclusive OR that determines whether the storage contents of the control signal storage section and the device status code match or disagree for each device. A signal transmission device for a remote monitoring control device, comprising: a circuit; and a display device that displays an error in a control signal based on a mismatch output of the exclusive OR circuit.