JP3069813B2 - Monitoring control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supervisory control system for transmitting and receiving data in a time-division manner, and more particularly to a supervisory control system capable of specifying a fault and relieving the fault when communication is interrupted.

[0002]

2. Description of the Related Art Conventionally, as a method of monitoring a plurality of monitored control devices by a monitoring control device, there are a method of performing polling and a method of not performing polling. FIG. 2 shows a configuration example of a system without polling, and FIG. 3 shows an example of a configuration of a system with polling. FIG.
In the method in which polling is not performed, a transmission unit and a reception unit respectively corresponding to the plurality of monitored control devices 2 and 3 are provided in the monitoring control device 1 and the communication paths 5A, 5B and 6 are respectively provided.
A, 6B. This method has a problem that as the number of monitored control devices monitored by the monitoring control device increases, the configuration of the monitoring control device itself increases and the number of communication paths also increases. Also, due to restrictions on the device configuration, it is not possible to flexibly cope with the addition of a monitored control device.

On the other hand, as shown in FIG. 3, in the polling method, the monitoring and control apparatus 1 connects to a plurality of monitored and controlled apparatuses 2 and 3 via communication paths 5 and 6, respectively. 1 polls the monitored control devices 2 and 3. The monitored control devices 2 and 3 are the monitoring control device 1
, A response signal is transmitted when a control signal addressed to itself is received, and the monitoring control device 1 receives a response signal from a corresponding monitored control device. For this reason,
Even if the number of monitored control devices increases, there is no restriction on the hardware. For example, if the number of polling operations is increased on the monitoring control device side, there is an advantage that expansion of the monitored control devices can be flexibly handled.

[0004]

In such a conventional monitoring and control system for performing polling, a monitoring and control device polls a plurality of monitored and controlled devices and a corresponding timing from a plurality of monitored and controlled devices. In this case, the communication between the monitoring control device and the monitored control device may be interrupted due to a failure of the transmission / reception unit of the monitoring control device, a failure of the transmission / reception unit of the monitored control device, or a communication path error. In the event of a failure, there is a problem that the cause of the failure cannot be identified and the failure cannot be remedied. SUMMARY OF THE INVENTION An object of the present invention is to provide a monitoring and control system which can identify a cause when a failure has occurred and which can relieve the failure.

[0005]

According to the supervisory control method of the present invention, the supervisory control device switches the transmission unit and the reception unit of the own device when the response signal from the monitored control device cannot be received. By performing a self-diagnosis, the state of the transmission / reception unit of the own device is self-diagnosed by transmitting / receiving a signal for performing a self-diagnosis, and if there is a failure in the current transmission / reception unit of the own device, switching to the spare transmission / reception unit is performed. A control signal for switching the transmission / reception unit is transmitted to the monitored control device that cannot receive the response signal unless the transmission / reception unit of the own device has a failure, and the transmission / reception unit is switched. Further, the monitored control device controls the switching unit so as to connect the transmitting unit and the receiving unit of the own device when the control signal from the monitoring control device cannot be received, and transmits and receives a signal for performing a self-diagnosis. Thus, the state of the transmitting / receiving unit of the own device is self-diagnosed, and if there is a failure in the working transmitting / receiving unit of the own device, switching to the spare transmitting / receiving unit is performed.

[0006]

When a response signal from the monitored control device cannot be received, the monitoring control device controls the switching unit so as to connect the transmission unit and the reception unit of the own device, and transmits and receives a signal for performing a self-diagnosis. Self-diagnosis of the status of the transmitting / receiving unit of the own device, switching to the spare transmitting / receiving unit if there is a failure in the active transmitting / receiving unit of the own device, and receiving a response signal if there is no failure in the transmitting / receiving unit of the own device. A control signal for switching the transmission / reception unit is transmitted to the monitored control device that cannot be switched to switch the transmission / reception unit. Further, the monitored control device controls the switching unit so as to connect the transmitting unit and the receiving unit of the own device when the control signal from the monitoring control device cannot be received, and transmits and receives a signal for performing a self-diagnosis. Thus, the state of the transmission / reception unit of the own device is self-diagnosed, and if there is a failure in the active transmission / reception unit of the own device, switching to the spare transmission / reception unit is performed.

[0007]

Next, the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention, wherein 1 is a monitoring and control device, and 2 and 3 are monitored and controlled devices, which are connected by wired or wireless communication paths 5 and 6. The monitoring control device 1 has a function of monitoring and controlling the monitored control devices 2 and 3, a function of transmitting and receiving data necessary for monitoring control in a time sharing manner, and a function of transmitting and receiving data required for monitoring control in a time sharing manner. The connection of the receiving units of the transmitting and receiving units 11 and 12 of the own device is changed to the transmitting and receiving units 21, 22, 31 and 3 of the monitored control devices 2 and 3.
Switching units 13 and 14 for switching to the transmission units of the transmission / reception units 11 and 12 of the own device, a function of performing self-diagnosis of the states of the transmission / reception units 11 and 12 of the own device by switching, and a monitored control based on a result of the self-diagnosis. Transmitter / receiver 2 of devices 2 and 3
Receiving sections 1, 22, 31, 32 and transmitting / receiving section 1 of own apparatus
A switching unit 15 for switching the connection between the transmission and reception units 1 and 12;
A monitoring control unit 16 for monitoring and controlling the 1,12 switching units 13,14,15 is provided.

The monitored and controlled device 2 has one address number, has transmission / reception units 21 and 22, and has a function of communicating with the monitoring and control device 1 and a polling interval from the monitoring and control device 1. Timer function and transmission / reception unit 2
The transmitting and receiving units 11 and 1 of the monitoring control device 1
Switching units 25 and 26 for switching to the transmission unit 2 or the transmission unit of the transmission / reception unit of the own device, a function of performing self-diagnosis of the state of the transmission / reception units 21 and 22 of the own device by switching, and a monitoring control device based on the result of the self-diagnosis. A switching unit 23 for switching the connection between the receiving units of the transmitting / receiving units 11 and 12 and the transmitting units of the transmitting / receiving units 21 and 22 of the own device, and monitoring control for monitoring and controlling the transmitting / receiving units 21 and 22 and the switching units 23, 25 and 26. It has a function of collecting and controlling the status of the own device.

The monitored control device 3 is the monitored control device 2
Although it has an address number different from that of the monitored and controlled device 2, it has a function of communicating with the monitored and controlled device 1, a timer function for measuring the polling interval from the monitored and controlled device 1, and Switching units 35 and 36 for switching the receiving unit to the transmitting units of the transmitting and receiving units 11 and 12 of the monitoring control device 1 or the transmitting unit of the own device; and a function of performing self-diagnosis of the states of the transmitting and receiving units 21 and 22 of the own device by switching. A switching unit 33 for switching the connection between the transmission / reception unit of the monitoring control device 1 and the transmission / reception units 31 and 32 of the own device according to the result of the self-diagnosis.
And a monitoring control unit 34 for monitoring and controlling the transmission / reception units 31 and 32 and the switching units 33, 35 and 36, and a function for collecting and controlling the state of the own device.

The monitoring control operation of the monitoring control device 1 and the monitored control devices 2 and 3 configured as described above will be described.
First, the monitoring control device 1 transmits a timer value of the polling interval measurement to the monitored control devices 2 and 3, and the monitored control devices 2 and 3 determine the polling interval from the monitoring control device 1 based on the timer value. Measure. Next, the monitoring control device 1 transmits a control signal to the monitored control device 2, and the monitored control device 2 receives the control signal and transmits a response signal to the monitoring control device 1. Next, the monitoring control device 1 transmits a control signal to the monitored control device 3, and the monitored control device 3 receives the control signal and transmits a response signal to the monitoring control device 1. When there are a large number of monitored control devices, this operation is repeated.

However, when the monitoring control device 1 cannot receive the response signal from the monitored control device 2, the monitoring control device 1 controls the switching unit 13 so as to connect the transmitting unit and the receiving unit of the transmitting / receiving unit 11 of the own device. Transmit a signal for performing self-diagnosis. If the signal cannot be received, the transmitting / receiving unit 1
Since it is known that there is a failure in 1, the switching unit 15 is controlled to switch to the spare transmitting / receiving unit 12. If you can receive it,
Since it is known that the transmission / reception unit of the monitored control device 2 has a failure, a control signal for controlling the switching unit 23 is transmitted to the monitored control device 2 to switch to the backup transmission / reception unit 22.

If a response signal cannot be received not only from the monitored and controlled device 2 but also from the monitored and controlled device 3, an abnormality occurs in the communication paths 5 and 6 or a failure occurs in the transmitting and receiving sections of the monitored and controlled devices 2 and 3. Since it is found that there is, the control signal for controlling the switching units 23 and 33 is transmitted to the monitored control devices 2 and 3 to switch to the spare transmission / reception units 22 and 32. At this time, if there is a response signal from both the monitored control devices 2 and 3, it is known that the transmission / reception unit on one side of the monitored control devices 2 and 3 has a failure, and that the communication disconnection has been rescued.

If there is no response signal from one of the monitored control devices 2 and 3, it is determined that the transmission / reception section of the monitored control device having no response signal has a failure, and communication with one of the monitored control devices has failed. It turns out that the rescue was successfully remedied. If there is no response signal in both the monitored control devices 2 and 3, it is determined that the communication paths 5 and 6 are abnormal or all the transmission / reception units of the monitored control devices 2 and 3 are faulty. Further, when the monitored control device 2 cannot receive the control signal from the monitoring control device 1, the monitored control device 2 controls the switching unit 25 so as to connect the transmitting unit and the receiving unit of the transmitting / receiving unit 21 of the monitored device, and performs the self-diagnosis. To send a signal to perform. When the signal cannot be received, it is determined that the transmission / reception unit 21 has a failure. Therefore, the switching unit 23 is controlled to switch to the backup transmission / reception unit 22. If the communication has been successfully received, it is determined that there is an abnormality in the communication path 5 or that the transmission / reception unit of the monitoring control device 1 has a failure.

As described above, the failure of the transmission / reception unit of the supervisory control device 1, the failure of the transmission / reception unit of the monitored control device 2, or the abnormality of the communication paths 5 and 6 causes the supervisory control device 1 and the monitored control device 2 to fail. Even if the communication is interrupted, the monitoring control device 1 and the monitored control device 2 perform the self-diagnosis of the transmission / reception unit of the own device, so that the cause of the failure can be easily specified. If there is a failure in the transmitting / receiving section, the failure can be remedied by switching to the spare transmitting / receiving section.

In the above description, an example in which the communication between the monitoring control device 1 and the monitored control device 2 is interrupted has been described. However, when the communication between the monitoring control device 1 and the monitored control device 3 has been interrupted. The same is true for Further, although the monitoring control device is configured with two transmission / reception units, it can be realized by increasing the number, and the monitored control device is also configured by two, but can be realized by increasing the number. Further, the monitoring control device and the monitored control device are configured in one stage, but can be realized even if the number of stages is increased.

[0016]

As described above, according to the present invention, the monitored control device is switched from the monitoring control device due to the failure of the transmission / reception unit of the monitoring control device, the failure of the transmission / reception unit of the monitored control device, or the communication path abnormality. When it becomes impossible to receive the response signal of
Both the monitoring control device and the monitored control device perform the self-diagnosis by transmitting / receiving a signal for performing the self-diagnosis by controlling the switching unit of the own device so as to connect the transmission unit and the reception unit of the own device. In this way, the failure state is isolated and the failure is remedied. That is, when the self-diagnosis signal is received on the monitoring control device side, it is first determined that the transmission / reception unit of the own device does not have a failure.

At this time, when the response signals from all the monitored control devices cannot be received, it is known that the communication path is abnormal, or that the transmission / reception section of all the monitored control devices has a failure, and the specific monitored When a response signal from the control device cannot be received, it is known that the transmission / reception unit of the monitored control device has a failure. Therefore, a control signal for controlling the switching unit for the monitored control device having no response signal is transmitted. By transmitting and switching the transmission / reception unit of the monitored control device, a failure can be remedied. Conversely, if the self-diagnosis signal cannot be received, it is known that the transmitting / receiving unit on the working side of the own device has a failure, so that the cause of the failure can be easily identified,
Further, by switching the connection with the monitored control device to the spare transmitting / receiving unit, the failure can be remedied.

On the monitored control device side, if the self-diagnosis signal can be received, first, it is confirmed that there is no failure in the transmitting / receiving unit of the own device, the communication path is abnormal, or the transmitting / receiving unit of the monitoring control device. It turns out that there is a failure. Conversely, if the self-diagnosis signal cannot be received, it is known that the transmission / reception unit on the active side of the own device has a failure. Therefore, the cause of the failure can be easily identified, and the connection with the monitoring control device is reserved. By switching to the transmission / reception unit on the side, it is also possible to relieve a failure.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional system without polling.

FIG. 3 is a block diagram of a conventional polling method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Monitoring control apparatus 2, 3 Monitored control apparatus 4 Switching part 5, 6 Communication path 11, 12, 21, 22, 31, 32 Transmission / reception part 13, 14, 15, 23, 25, 26, 33, 35, 3
6 switching unit 16, 24, 34 monitoring control unit

Claims (1)

(57) [Claims] A monitoring and control device connected to a plurality of monitored and controlled devices via a wired or wireless communication path, wherein the monitoring and control device transmits and receives data necessary for monitoring and control in a time-division manner; A switching unit for switching the connection of the receiving unit of the own device to the transmitting unit of the monitored control device or the transmitting unit of the own device, a function of performing a self-diagnosis of the state of the transmitting / receiving unit of the own device by switching, and a result of the self-diagnosis A switching unit for switching the connection between the transmitting unit of the own device and the receiving unit of the monitored control device, and a monitoring control unit for monitoring and controlling the transmitting and receiving unit and the switching unit of the own device. A function of having an address number and communicating with the monitoring and control apparatus, a timer function of measuring a polling interval from the monitoring and control apparatus, and a transmitting section of the monitoring and control apparatus or a transmitting section of the own apparatus. Switching to switch to A function of self-diagnosing the state of the transmission / reception unit of the own device by switching, a switching unit for switching connection between the transmission unit of the own device and the reception unit of the monitoring control device based on the result of the self-diagnosis, A monitoring control unit that monitors and controls the transmission / reception unit and the switching unit; and a function that collects and controls the status of the own device. Further, the monitoring control device is configured to automatically control when a response signal from the monitored control device cannot be received. The switching section is controlled so as to connect the transmission section and the reception section of the apparatus, and the state of the transmission / reception section of the apparatus is self-diagnosed by transmitting / receiving a signal for performing the self-diagnosis, and the current transmission / reception section of the apparatus is used. If there is a failure, switch to the spare transmission / reception unit and send a control signal to switch the transmission / reception unit to the monitored control device that cannot receive a response signal unless the transmission / reception unit of the own device has a failure. Transceiver The monitored control device controls the switching unit so as to connect the transmitting unit and the receiving unit of the own device when the control signal from the monitoring control device cannot be received. By transmitting and receiving a signal for performing a diagnosis, the state of the transmitting and receiving unit of the own device is self-diagnosed, and if there is a failure in the working transmitting and receiving unit of the own device, switching to a spare transmitting and receiving unit is performed. Monitoring control method.