JPH0426599B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a method for transmitting control signals in a remote monitoring and control device.

B. Summary of the Invention The present invention provides a remote monitoring and control device in which a plurality of devices to be controlled in a slave station are grouped and a control signal is transmitted for each group from the master station to the slave stations, wherein the control signal is sent to the multiple devices in the group. In addition to the control code that indicates the control content for each device, we have provided an auxiliary code that indicates whether the control can be executed, and by controlling from both codes, it is possible to prevent incorrect control of the device. It is something.

C. Prior Art A remote monitoring control device transmits a control signal from a central master station to a slave station where equipment is installed 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 monitoring and control reliability and cost, and data transmission between the master station and slave stations depends on 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 power system shown in Figure 3, 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 the master station transmits control signals in groups at once from the master station, and controls the power supply system in the accident zone or construction zone by on/off control of breakers, switches, etc. It also creates a power supply detour 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.

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.
In both cases, emphasis is placed on preventing transmission errors, so if an erroneous control signal is created on the transmitting side, a test code is added to the erroneous control signal to prevent transmission errors, but it is not true. It does not prevent error control.

An object of the present invention is to provide a signal transmission method that prevents erroneous control due to malfunctions in the transmitting/receiving system or signal processing when transmitting control signals from a master station to a slave station in groups.

E. Means for Solving Problems In a remote monitoring and control device in which a plurality of devices to be controlled in a slave station are grouped and the devices to be controlled are controlled in groups by control signals transmitted from the master station to the slave stations. , the control signal is provided with a control code that instructs control contents in bits for each device to be controlled in the group, and an auxiliary code that instructs in bits whether or not control can be executed for each device to be controlled in the group, and is transmitted from the master station. The present invention is characterized in that, by transmitting and receiving control signals to and from the slave station, control of the control content specified by the control code is executed only for the control target equipment that the auxiliary code allows to be controlled.

F Effect Each bit of the control code instructs on/off control of the controlled device in the group, and in response to this instruction, the control code is applied only to the device that instructs the control target device to be executed from each bit of the auxiliary code. The control code is outputted so that the specified ON/OFF control state is achieved, thereby preventing erroneous control in the following four cases due to a code creation error, transmission error, or reception processing error of either the control code or the auxiliary code.

(1) If the control code is correct and the auxiliary code incorrectly indicates executable and determines execution not possible, the equipment will remain in its current state and error control will not occur.

(2) If the control code is correct and the auxiliary code incorrectly indicates whether or not to execute and it becomes executable, this will be the same as specifying the correct state of the device and will not result in error control.

(3) If the control code designates ``off'' to change the device from the ``on'' state to the ``off'' state, it becomes an ``on'' designation by mistake. Controlling the device as it is will prevent incorrect control of the equipment.

(4) If the control code incorrectly specifies ``off'' when the device should remain in the ``on'' state, the auxiliary code specifies whether or not to execute, so the erroneous ``off'' designation will not be executed.

G. Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 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, which can be switched and displayed by the operator's operation, and the operator can use a light pen to select the device in the device group that requires control from among the displayed figures. Select and specify using 2nd grade. Control execution for designating ON/OFF of the designated equipment is performed by the operator operating the execution switches 3 ₁ to 3n. For example, if the device is a switch, a breaker, etc., the execution switch 3 instructs it to be turned on or 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 input to the code converter 6 via the interfaces 4 and 5, and the converter 6 converts the device selection control signal into Performs selection and conversion to control signals corresponding to the specified equipment. Further, the conversion 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 selection section 8, and the code creation section 9 adds a slave station code, group position code, etc. to the data to create transmission data in the desired transmission format. , an interface 10, and a transmitter 12 via a system bus 11.
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.

Here, a control code and an auxiliary code are provided for storage of control signals by the control command detection storage unit 7 and generation of a transmission format by the code generation unit 9. This control execution code is data that instructs the control content of the controlled device in bits, such as turning on a switch,
Assign “off” to logic “1” and “0”. on the other hand,
The auxiliary code is data that indicates, in bits, whether control can be executed for the device that the control code is trying to control.For example, a logic “1” is assigned to a device that can be controlled, and a logic “0” is assigned to a device that cannot be controlled. assign.

A control signal consisting of such a control code and an auxiliary code prevents errors in device control according to the instructions of the bits of both 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 the remote monitoring and control device for the feeder line system shown in FIG. 3, 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.

In Fig. 1, the control system specifies the slave station to which the control equipment belongs (for example, the substation in Fig. 3) using synchronization signals, station addresses, etc., and selects the group position (for example, the substation in the substation in Fig. 3). (4 pieces of disconnector)
is specified all at once, and control signals of control objects that are likely to be controlled simultaneously by control data are transmitted all at once. The control data consists of a control code and an auxiliary code, each of which is assigned 4 bits in the diagram, and the control code indicates whether each of the four control devices in the substation is turned on or off.
corresponds to the logical "1" and "0" of each bit, and the correspondence with the control equipment is obtained depending on the bit position.

Each bit of the auxiliary code is associated with each bit of the control code, and is shown in a 4-bit configuration. Then, the auxiliary code indicates, with logical "1" and "0", which devices are to be controlled and which are not, among the control devices targeted by the control code. For example, if the status of each device in a group is "on", "off", "on", "on", and the execution command is "off", "off", "on", "on", the control code is "0", "0", "1", "1",
Furthermore, the auxiliary codes are set to "1", "0", "0", and "0", and the control is executed by turning the ON state of the first device into the OFF state, and the control is not executed for the other devices. give instructions.

Through transmission with such an auxiliary code added, the slave station outputs equipment control based on control data to the equipment corresponding to the auxiliary code "1". That is, in this example, even if the second to fourth control code bits are incorrect, if the auxiliary code is correct, the control will not be executed and will not result in erroneous control since it will be 0. Conversely, even if the auxiliary code erroneously changes from "0" to "1", if there is no error in the control bit, the control is in the same direction as in the conventional state, so no error occurs; similarly, the auxiliary code changes from "1" to "0". Even if there is a mistake, it will not be executed, so it will not be an error control.

Therefore, by transmitting and receiving a double code, that is, a control signal having a control code and an auxiliary code, it is possible to eliminate errors in creating the control signal, malfunctions in the transmission system, and erroneous control due to disturbances.

Here, if the control system and the display system have the same number of bits as shown in Figure 1, the auxiliary code required for the display system to display details within the group will be the same as the auxiliary code required for controlling each device within the group of the control system. By assigning the auxiliary code, the transmission device can use the same number of bits for both the control system and the display system.

In particular, even if there is an error in the control code when the control signal is used to collectively control a plurality of control devices, duplication with the auxiliary code prevents other devices from being erroneously controlled. This system can be easily applied even to a cyclic transmission system in which the number of bits in the control system and display system do not match.

H. Effects of the Invention As described above, according to the present invention, a control signal includes a control code and an auxiliary code, and erroneous control due to an error in the control signal can be prevented from the logic states of both the bits of the control execution code and the bits of the auxiliary code. This has the effect of preventing erroneous control due to malfunctions in signal processing or errors in the transmission system in the transmission system of the master station or the reception system of the slave station.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a transmission format according to the present invention, FIG. 2 is a block diagram of a master station of a remote monitoring and control device, and FIG. 3 is a system diagram of a feeder line. 1...Display device, 2...Light pen,
3 ₁ to 3n...Execution switch, 6... Code converter,
7...Control command detection storage unit, 8...Selecting unit, 9...
... code creation section, 12 ... transmission section, 13 ... reception section, 15 ... display content detection storage section.

Claims (1)

[Claims] 1. In a remote monitoring and control device in which a plurality of devices to be controlled within a slave station are grouped and the devices to be controlled are controlled in groups by control signals transmitted from a master station to the slave stations, the control signal is A control code that instructs in bits the content of control for each device to be controlled within the group, and an auxiliary code that instructs in bits whether or not control can be executed for each device to be controlled in the group are provided, and control signals are transmitted and received from the master station to the slave stations. A signal transmission method for a remote monitoring and control device, characterized in that control of the control content specified by the control code is executed only for the control target equipment that the auxiliary code allows to be controlled.