JP3306474B2 - 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. 3 shows a configuration example of a system without polling, and FIG. 4 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, in the polling method as shown in FIG. 4, the monitoring control device 1 connects to a plurality of monitored control devices 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 present invention, there is provided a supervisory control system comprising: a supervisory control device connected to a plurality of monitored control devices via a wired or wireless communication path;
The monitored control device has a different address number, and has a transmitting / receiving unit that communicates with the monitoring control device, and a function of collecting and controlling the status of the monitored device. In addition, monitoring and control device, sending and receiving
A communication unit, a function of monitoring and controlling the plurality of monitored control devices, a function of transmitting and receiving data necessary for monitoring and control in a time-division manner, and a connection of a reception unit of the own device to a transmission unit of the monitored control device. Or a switching unit for switching to the transmission unit of the own device,
It has a function of performing self-diagnosis of the state of the transmission / reception unit of its own device by switching. And the self-diagnosis function
When the monitoring control device cannot receive a response signal from at least one monitored control device, the monitoring control device controls the switching unit so as to connect the transmitting unit and the receiving unit of the own device, and performs the self-diagnosis.
Signal is sent and received, and the signal is received.
The transmission / reception unit of the own device has no failure,
The transmission / reception unit of one monitored control device or the one monitored
It is determined that there is an abnormality in the communication path with the visual control device .

In the monitoring control method according to the present invention, the monitored control device has different address numbers, a plurality of transmitting / receiving units for communicating with the monitoring control device, and measures a polling interval from the monitoring control device. And a switching unit that switches the connection between the transmission unit of the own device and the reception unit of the monitoring control device when a control signal from the monitoring control device cannot be received at intervals within a timer value set by the monitoring control device. And a monitoring control unit that monitors and controls the transmitting / receiving unit and the switching unit of the own device, and has a function of collecting and controlling the state of the own device.

On the other hand, the supervisory control device comprises a plurality of transmitting / receiving units.
When, a function of monitoring and controlling a plurality of the monitored control device, a function of transmitting and receiving data necessary to monitor and control a time-sharing, the transmission unit of the monitoring and control device the connection of the receiving portion of the device itself or its own A switching unit for switching to the transmitting unit of the device, a function of performing self-diagnosis of the state of the transmitting and receiving unit of the own device by switching, and a connection between the transmitting unit of the own device and the receiving unit of the monitored control device based on the result of the self-diagnosis. A switching unit that performs switching, and a monitoring control unit that monitors and controls the transmitting / receiving unit and the switching unit of the own device are provided.

[0008] When the monitored control device cannot receive the control signal from the monitoring control device within the timer value, the monitored control device switches to the backup transmission / reception unit. In addition, the monitoring control device
Function of self-diagnosis, the monitoring control device for performing a self-diagnosis I line controls the switching unit to connect the transmitter and receiver of the own device when no response signal from the monitoring control unit Signal cannot be received and received.
When it is determined that there is a failure in the transmitting / receiving unit of the own device , switching to the transmitting / receiving unit is performed, and it is determined that the signal is received.
The transmission / reception unit of the own device has no failure,
Sends a control signal to control the switching unit to the monitored controller
And received response signals from multiple monitored control devices.
In this case, one of the transmission / reception units of the monitored
Response from one of the monitored control devices
When no signal is received, the monitored
Judgment that the transmitting / receiving unit has a fault, and
When no response signal is received from the
It is determined that the communication path with the device is abnormal .

[0009]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a first embodiment of the present invention. 1 is a supervisory control device, 2 and 3 are plural (here two)
And are connected by wired or wireless communication paths 5 and 6, respectively. The monitoring control device 1 has a function of monitoring and controlling the monitored control devices 2 and 3, a switching unit 4 for switching the connection of the receiving unit of the monitoring device to the transmitting unit of the monitored control devices 2 and 3 or the transmitting unit of the own device, It has a function of performing self-diagnosis of the state of the transmission / reception unit of its own device by switching. The monitored control devices 2 and 3 have different address numbers, and have a function of communicating with the monitoring control device 1 and a function of collecting and controlling the status 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 below. First, 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.

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 4 to connect the transmitting unit and the receiving unit of the monitoring control device 1. Then, a signal for performing self-diagnosis is transmitted from the transmission unit, and if the signal can be received by the reception unit, it is understood that the transmission / reception unit of the own device has no failure. or,
At this time, when the response signal cannot be received from the monitored control device 3, it is understood that the communication paths 5 and 6 are abnormal or the transmission / reception units of the monitored control devices 2 and 3 have a failure. On the other hand, when the response signal from the monitored control device 3 can be received, it is understood that the transmission / reception unit of the monitored control device 2 has a failure.

Conversely, when the self-diagnosis signal cannot be received, it is known that the transmitting / receiving unit of the own device has a failure. Therefore, even if the communication between the monitoring control device 1 and the monitored control devices 2 and 3 is interrupted, the monitoring control device 1 can identify the cause of the failure by performing a self-diagnosis of the transmission / reception section of its own device. It becomes possible.

FIG. 2 is a block diagram of a second embodiment of the present invention. In this embodiment, it is possible to specify the cause of a failure and to realize the relief of the failure. In FIG. 1, reference numeral 1 denotes a monitoring control device, and reference numerals 2 and 3 denote monitored control devices. The monitored control device 2 has one address number, has a function of communicating with the monitoring control device 1, a timer function for measuring a polling interval from the monitoring control device 1,
The transmitting / receiving section of the monitoring and control apparatus 1 and the transmitting / receiving sections 21 and 2 of the own apparatus
Switching unit 23 for switching the connection of the transmission / reception units 2 and transmission / reception units 21 and 21
2 and a monitoring control unit 24 for monitoring and controlling the switching unit 23;
It has a function to collect and control the status of its own device.

The monitored control device 3 is the monitored control device 2
Has a different address number from the above, but has a function of similarly communicating with the monitoring control device 1, a timer function for measuring a polling interval from the monitoring control device 1, a transmission / reception unit of the monitoring control device 1, and transmission / reception of the own device. A switching unit 33 for switching the connection of the units 31 and 32, a monitoring control unit 34 for monitoring and controlling the transmitting and receiving units 31, 32 and the switching unit 33, and a function of collecting and controlling the state of the own device are provided.

On the other hand, 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-division manner, and a transmitting and receiving unit 1 of its own device.
Switching units 13 and 14 for switching the connection of the receiving units 1 and 12 to the transmitting units of the monitored and controlled devices 2 and 3 or the transmitting units of the transmitting and receiving units 11 and 12 of the own device; A self-diagnosis function for the state of the control unit 12 and a switching unit 1 for switching the connection between the transmitting and receiving units of the monitored and controlled devices 2 and 3 and the transmitting and receiving units 11 and 12 of the own device based on the result of the self-diagnosis
5 and a monitoring control unit 16 for monitoring and controlling the transmission / reception units 11 and 12 switching units 13, 14 and 15.

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.

The failure of the active transmission / reception unit 11 of the supervisory control device 1, the failure of the active transmission / reception unit 21 of the supervisory control device 2, or the failure of the communication paths 5 and 6 causes the monitoring control device 1 to fail.
When the communication between the monitoring control device 2 and the monitored control device 2 is interrupted, the monitored control device 2 cannot receive the control signal from the monitoring control device 1 within the timer value, and controls the switching unit 23 to control the standby transmission / reception unit. Switch to 22.

The monitoring control device 1 controls the switching unit 13 to connect the transmitting unit and the receiving unit of the transmitting / receiving unit 11 of the own device, and transmits a signal for performing self-diagnosis in the transmitting / receiving unit 11. Send from the department. If this signal cannot be received by the receiving unit in the transmitting / receiving unit 11, it is known that the transmitting / receiving unit 11 has a failure, so the switching unit 15 is controlled to switch from the working transmitting / receiving unit 11 to the standby transmitting / receiving unit 12. Switch.

Conversely, if the self-diagnosis signal can be received but the response signal cannot be received from the monitored control device 3, the communication paths 5 and 6 are abnormal, or the transmission / reception sections of the monitored control devices 2 and 3 have malfunctions. That the monitored control devices 2 and 3
, A control signal for controlling the switching units 23 and 33 is transmitted. 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 communication disconnection can be relieved.

However, it can be seen that there is a failure in the transmission / reception unit of the monitored control device which has a response signal from one of the monitored control devices 2 and 3 and has no response signal if there is no other response signal. If there is no response signal from both the monitored control devices 2 and 3, the communication paths 5 and 6 are abnormal, and the monitored control devices 2 and 3 are abnormal.
It can be seen that all the transmission / reception units have a failure.

Further, when the self-diagnosis signal can be received and the response signal from the monitored control device 3 can be received, it is known that the transmission / reception section of the monitored control device 2 has a failure. A control signal for controlling the switching unit 23 is transmitted to the device 2. If there is no response signal from the monitored control device 2, it can be understood that the transmission / reception units 21 and 22 of the monitored control device 2 have a failure. Further, if there is a response signal from the monitored control device 2, it is known that the transmission / reception unit on one side of the monitored control device 2 has a failure, and the communication disconnection can be relieved.

To summarize the above, the monitoring control device 1
If the communication between the monitoring control device 1 and the monitored control device 2 is interrupted due to a failure of the transmitting / receiving portion of the monitoring device, a failure of the transmitting / receiving portion of the monitored control device 2, or an abnormality of the communication paths 5 and 6, etc. The device 2 measures the polling interval from the monitoring and control device 1, and when the control signal cannot be received, controls the switching unit 23 to switch to the spare transmitting and receiving unit. Perform a self-diagnosis of the department.

As a result, if the cause is in the transmission / reception unit of the monitored control device 2, the switching unit 2 of the monitored control device 2
3 is transmitted, and if there is no response signal from the monitored control device 2, the transmission / reception unit 2 of the monitored control device 2
It can be seen that there is a failure in 1,22. In addition, if there is a response signal, it is known that the transmission / reception unit on one side of the monitored control device 2 has a failure, and the communication interruption can be relieved. Further, when the transmitting / receiving unit of the own device has a failure, it is possible to remedy the disconnection by switching to the spare transmitting / receiving unit.

In the above description, an example has been described in which the communication between the monitoring control device 1 and the monitored control device 2 is interrupted, but the communication between the monitoring control device 1 and the monitored control device 3 is 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.

[0025]

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 control signal of
By performing the self-diagnosis by controlling the switching unit of the own device so as to connect the transmitting unit and the receiving unit of the own device, the cause of the failure can be easily specified.

Further, according to the present invention, the monitored control device receives a control signal from the monitor control device due to a failure of the transmitting / receiving unit of the monitored control device, a failure of the transmitting / receiving unit of the monitored control device, or an abnormal communication path. When the transmission cannot be received, the switching unit is controlled so that the transmission unit and the reception unit of the own device are connected to perform a self-diagnosis, whereby the cause of the failure can be specified. In other words, the cause of the fault is
The transmitter / receiver of the device is out of order,
The communication unit is faulty and the communication path between the two devices is abnormal.
At this time, the failure can be relieved by outputting a control signal to the monitored control device having a failure in the transmission / reception unit to control the switching unit.

[Brief description of the drawings]

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

FIG. 2 is a block diagram of a second embodiment of the present invention.

FIG. 3 is a block diagram of a conventional system that does not perform polling.

FIG. 4 is a block diagram of a conventional polling method.

[Description of Signs] 1 monitoring control device 2, 3 monitored control device 4 switching unit 5, 6 communication path 11, 12, 21, 22, 31, 32 transmission / reception unit 13, 14, 15, 23, 33 switching unit 16, 24, 34 monitoring control unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 3/46 H04B 1/74 H04L 29/14

Claims (2)

(57) [Claims] A monitoring control device, a plurality of monitored control devices,
Are connected by a wired or wireless communication path, and the plurality of monitored
The control devices have different address numbers, and
Communication units, and a port from the monitoring and control unit.
Timer function to measure the interval of
From the monitoring and control unit at intervals within the timer value set from
Monitoring with its own transmitter when it cannot receive the control signal
A switching unit for switching the connection of the receiving unit of the control device;
A monitoring control unit that monitors and controls the transmission / reception unit and switching unit of the device
In addition, the monitoring and control device has a function of collecting and controlling the status of the own device.
A function to monitor and control the supervisory control device is provided,
A function to transmit and receive important data in a time-sharing manner
The connection of the transmitting unit is transmitted by the transmitting unit of the monitored control device or by the own device.
Switching unit for switching to the
A function to self-diagnose the status of the transmitter / receiver of the device
According to the result of the transmission of the own device and the receiving unit of the monitored control device
Switching unit for switching the connection of the transmission and reception unit of its own device
A monitoring control unit that monitors and controls the switching unit, wherein the plurality of monitored control devices are controlled by a monitoring control device;
If a signal cannot be received within the timer value,
The function of performing self-diagnosis of the monitoring control device by switching to the
The control device is one of the plurality of monitored control devices.
Response signal from the monitored control device cannot be received
Of the switching unit so that the transmitting unit and the receiving unit of the own device are connected.
Sends and receives signals for performing self-diagnosis by controlling
If the signal cannot be received, the transmitting / receiving unit of
Switch to the spare transceiver and determine
When this signal is received, the transmitter / receiver of the own device has a fault.
Determining that no spare transceiver unit controls the switching unit of the monitored control device
In the polling after the switching, the plurality of
Receives response signals from all monitored control devices.
When receiving, the transmission / reception unit before the switching of the monitored control device
Is judged to have a failure, and the response from the monitored
When no signal is received, any of the monitored
It is determined that there is also a failure in the transmitting and receiving part of
Monitoring and control scheme. 2. A function for performing the self-diagnosis of the monitoring control device.
Wherein the monitoring and control device is connected to the plurality of monitored and controlled devices.
Of the switching unit to connect the transmitting unit and the receiving unit of the own device when all response signals of
To send and receive signals for self-diagnosis, and
If the signal cannot be received, the
Switch to the spare transceiver, and
When the receiver receives the signal, there is no failure in its own transceiver unit
And controlling the switching units of all the monitored control devices to perform the spare transmission.
In the polling after switching to the receiver,
Receiving response signals from the plurality of monitored control devices.
The communication path with each monitored control device is abnormal.
2. The monitoring control method according to claim 1, wherein the determination is performed.
formula.