JP4453606B2 - Remote monitoring control system - Google Patents

Description

  The present invention relates to a remote monitoring control system, and more particularly to a control procedure for continuously controlling a control target device by sequentially transmitting a control signal from a master station device to a slave station device.

  FIG. 3 shows a configuration example of the remote monitoring control system. The host system 1 which becomes the host computer of the central monitoring room transmits control information to the master station device 2, and the master station device 2 controls the slave station device 3 to the master station transmitter 3A via the slave station transmitter 2A. The IO processing unit 3B of the slave station device 3 selects and controls the control target device (actual machine) 4 according to the received control signal. On the contrary, the slave station device 3 collects display signals and measurement signals of the actual machine 4 or the like by the IO processing unit 3B, and uses this as a monitoring signal from the master station transmission unit 3A to the slave station transmission unit 2A of the master station device 2. The upper system 1 transmits necessary control information based on the monitoring signal and the like.

  For transmission of control signals between the master station device 2 and the slave station device 3, an HDLC transmission protocol (high level data Many link control procedures have been adopted.

  In such a remote monitoring control system, when continuously controlling one or a plurality of control target devices, when the control information is output from the host system 1, a plurality of continuous control signals are transmitted from the master station device 2. These control signals are sequentially transmitted to the slave station device at the transmission timing of the master station device 2. When transmitting the control signal, the slave station device 3 operates the selection control circuit when receiving the control signal, selects the control target device, holds the control output of the device for a certain period of time, and selects the completion signal. Is returned to the master station. The master station device 2 receives the selection completion signal and transmits the next control signal to the slave station device. When the slave station device has held the control output of the device for a certain period of time, it resets the selection signal of the device.

Such repeated device selection and control may take time to select the next device, and may not be able to respond quickly to an emergency situation. In order to cope with this, the master station device transmits a plurality of control signals determined in advance to the slave station device, and on the basis of this control signal, the slave station device determines the device number to be controlled next during device control. There has also been proposed a method of causing the master station device to confirm the control content by returning the control content to the master station device and shifting to the next device selection control under the condition that the control permission signal from the master station device has been received (for example, Patent Literature 1).
Japanese Patent Publication No. 6-32511

  In general, when the HDLC protocol is used as a transmission protocol between the master station device and the slave station device, the HDLC protocol reduces the amount of information and simplification. The control signal transmitted to the station device and the display signal and measurement signal transmitted from the slave station device to the master station device, there is no information for notifying the master station device of the operation state of the selection control circuit of the slave station device.

  For this reason, for continuous control of the control target equipment, the master station device outputs a control signal to the slave station device at regular intervals, but the slave station device is selected for a fixed time for the first control output. The control circuit is in operation. When the slave station device receives the second control signal from the master station during the operation of the selection control circuit in the device, the slave station device cannot accept the next control (lock time) and cannot perform continuous control. Therefore, the control signal interval from the master station device is determined to be a fixed time (about 2 seconds) in consideration of the operation time of the selection control circuit, and the control signal is transmitted from the master station device at this time interval.

  However, in the transmission of the control signal from the master station device to the slave station device, if the arrival of the control signal to the slave station device is delayed due to competition with the measurement signal, the master station device may check the delay. The control signal is transmitted to the slave station device after a certain time (about 2 seconds) by the timer of the master station device, but the selection / control circuit in the slave station device is delayed by the selection / control in the slave station device. Since it is in operation, the control signal sent next time cannot be accepted.

  FIG. 4 shows a control mode when the above-described continuous control is normal and when a failure occurs. In the case of “ventilation manual control” for the first time and “fire manual control” for the second time, when the “ventilation manual control” signal is transmitted from the master station device to the slave station device at time t1 in the normal state (time t2) During the slave station selection by the slave station selection relay, the control output is executed to the ventilation facility by the control relay, and this control can be finished by the second “fire manual control” (time t3).

  However, when a problem occurs, a transmission delay of the control signal from the master station device to the slave station device occurs (time t4), and with this delay, the control of the ventilation facility is also delayed, and the second "fire manual control" At the time of transmission (time t5), the slave station is being selected and cannot be accepted.

  Although it is conceivable that the time interval of transmission of the master station device is sufficiently long, this will cause a reduction in the control performance of the system, and a control delay in the case of continuous control.

  Note that the method of shifting to the control of the next device under the condition of receiving the control permission signal from the master station device and the confirmation by the master station device according to Patent Document 1 is a control in which the control target device and its control order are determined in advance. In this method, signals are transmitted to the slave station device in a lump, and in the method of sequentially transmitting different control devices and control signals in the control order from the master station device to the slave station device, the arrival of the control signal is delayed as described above. It is not possible to solve the problem.

  An object of the present invention is to provide a remote monitoring control system that solves the problem of the control delay of the system and the problem of control delay in the case of continuous control.

  In order to solve the above-described problem, the present invention provides a master station device that uses a reception response (RR) in the HDLC transmission protocol as a start timer during continuous control of a device to be controlled, after the lock time of the slave station device has elapsed. A system having a control procedure for transmitting the control signal to the slave station device, or the slave station device that has received the control signal is operating when the next control signal is received even when the selection control circuit is operating according to the previous selection control signal. A system having a control procedure for canceling selection control by the previous selection control signal and executing device selection control according to the next selection control signal without invalidating the system is characterized.

(1) The monitoring control signal is transmitted between the master station device and the slave station device according to the HDLC transmission protocol, and the slave station device selects the control target device with a certain lock time according to the received control signal, In a remote monitoring control system that controls the device,
When the master station device transmits a reception response (RR) in the HDLC transmission protocol from the slave station device to the control signal transmitted to the slave station device during continuous control of the device to be controlled , the reception response (RR) And a control procedure for transmitting the next control signal to the slave station device after the lock time of the slave station device has elapsed.

(2) The monitoring control signal is transmitted between the master station device and the slave station device according to the HDLC transmission protocol, and the slave station device selects a control target device with a certain lock time according to the received control signal, In a remote monitoring control system that controls the device,
The slave station device has a control procedure for transmitting an operation response display signal to the master station device when selection control is started according to the selection control signal,
The master station device has a control procedure for transmitting the next control signal when the operation response display signal is received during continuous control of the device to be controlled,
The slave station device cancels the selection control by the previous selection control signal when receiving the next control signal during the selection control according to the previous selection control signal, and selects the control target device according to the next selection control signal. It has the control procedure which performs control, It is characterized by the above-mentioned.

As described above, according to the present invention, it is possible to perform control with no control delay when the control performance of the system is deteriorated and when continuous control is performed. In particular,
The master station device uses the reception response (RR) in the HDLC transmission protocol as a start timer and sets the control procedure for transmitting the next control signal to the slave station device after the lock time of the slave station device has elapsed. The reliability is improved by continuous control that confirms the reception status.

  In addition, the slave station device that has received the control signal cancels the selection control by the previous selection control signal without invalidating the next control signal even when the selection control circuit is operating according to the previous selection control signal. Since the control procedure is such that the device selection control is executed in accordance with the next selection control signal, the master station device can perform continuous control in which the operation response display of the actual device is confirmed.

(Embodiment 1)
The HDLC protocol includes a reception ready (RR) signal for a response when a signal is received. In the present embodiment, the control signal is transmitted from the master station device to the slave station device by starting the control interval timer of the master station with a reception response from the slave station device, thereby causing a control signal due to HDLC transmission delay or retransmission. Corrects when an arrival delay occurs in the slave station device.

  FIG. 1 shows the control procedure of this embodiment. In the master station device, the transmission unit 2A of the master station sets the control signal transmission interval (control interval) to 2 seconds and sets the time measurement start time to the next control 2 seconds after the reception response (RR) is received. It is a control procedure for transmitting signals.

  By this control procedure, as shown in FIG. 1, the slave station transmission unit 2A transmits a control signal to the master station transmission unit 3A of the slave station device 3 at time t1, and immediately thereafter (time t2), the slave station device. When the measurement information is transmitted to the master station device, the master station device receives the reception response (RR) for the control signal transmitted at time t1 (time t3), from the time of this reception response (RR). After the control interval (2 seconds), the next control signal is transmitted (time t5).

  Therefore, in the control interval of the first control signal, the next control signal is transmitted at time t4, but at time t5 which is 2 seconds after time t3 of the reception response (RR) from the slave station device, the next control signal is transmitted. Transmit control signals. Thereby, after the selection of the control target device by the selection relay and the control of the control target device by the control relay is completed on the slave station device side, the next control signal is transmitted, and normal continuous control can be performed.

(Embodiment 2)
In the present embodiment, when the master station device receives the operation response display signal from the slave station device in response to the control signal, the master station device transmits the next control signal, and the slave station device is operating in the selection control circuit according to the previous selection control signal. When the next control signal is received, it is not invalidated, and the selection control by the previous selection control signal is canceled, and the device selection control is executed according to the next selection control signal.

  FIG. 2 shows the control procedure of this embodiment. The slave station transmission unit 2A transmits a control signal to the parent station transmission unit 3A of the slave station device 3 at time t1, and the slave station selection relay selects a device according to the control signal, and the control relay executes control. At the start of this selection control (time t2), the slave station device transmits an operation response display signal for displaying the control state to the master station device. The master station device receives the operation response display signal in the control state and transmits the signal to the higher system side. Here, when the master station device needs to transmit the next control signal, it transmits the control signal without waiting for the elapse of time (for example, 2 seconds) from the previous transmission to the current transmission (time t3). When the slave station device receives the next control signal from the master station device (t4), the slave station device cancels this selection control and gives priority to the next control signal even during control according to the previous control signal ( After priority), start the device selection control.

  Therefore, this embodiment performs post-priority processing by the slave station device, and there is a possibility that the control output time to the actual device cannot be guaranteed, but the operation response display of the actual device is confirmed by the master station device. Therefore, there is no loss in selection control during continuous control.

The control procedure which shows Embodiment 1 of this invention. The control procedure which shows Embodiment 2 of this invention. A configuration example of a remote monitoring control system. FIG. 4 is a diagram showing normal / failure occurrence during continuous control.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Host system 2 Master station apparatus 2A Slave station transmission part 3 Slave station apparatus 3A Parent station apparatus 3B IO processing part / selection control circuit 4 Control object apparatus

Claims (2)

The monitoring control signal is transmitted between the master station device and the slave station device according to the HDLC transmission protocol, and the slave station device selects the control target device with a certain lock time according to the received control signal, and the device is selected during that time. In the remote monitoring control system to control,
When the master station device transmits a reception response (RR) in the HDLC transmission protocol from the slave station device to the control signal transmitted to the slave station device during continuous control of the device to be controlled , the reception response (RR) A remote monitoring control system characterized by having a control procedure for transmitting the next control signal to the slave station apparatus after a lapse of the lock time of the slave station apparatus using a start timer. The monitoring control signal is transmitted between the master station device and the slave station device according to the HDLC transmission protocol, and the slave station device selects the control target device with a certain lock time according to the received control signal, and the device is selected during that time. In the remote monitoring control system to control,
The slave station device has a control procedure for transmitting an operation response display signal to the master station device when selection control is started according to the selection control signal,
The master station device has a control procedure for transmitting the next control signal when the operation response display signal is received during continuous control of the device to be controlled,
The slave station device cancels the selection control by the previous selection control signal when receiving the next control signal during the selection control according to the previous selection control signal, and selects the control target device according to the next selection control signal. A remote monitoring control system comprising a control procedure for executing control.

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