JPH05236565A - Monitor control system - Google Patents

Abstract

PURPOSE:To reduce the processing time by sending different data depending on whether or not stored state is coincident with the current state. CONSTITUTION:A monitor controller 1 is provided with a function to apply monitor control to monitored controllers 2, 3 through a communication line 8 and implementing transmission reception of data required for monitor control in time division, the monitored controllers 2, 3 have different address number and each is provided with a data transmission section 4 making communication with the monitor controller 1, a data selection section 5 comparing the state of preceding data of its own equipment and current data, a storage section 6 storing the state of collection data and a reception section 7 receiving a data transmission request signal of the monitor controller 1. Then, the monitored controllers 2, 3 store the reply signal with respect to a preceding data transmission request from the monitor controller 1 and compare the preceding state with the current state when the data transmission request of a current point of time is received and the controllers 2, 3 send data representing no state change when they are coincident with each other and send data representing the state of its own equipment when dissident from each other.

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 in which data is transmitted and received between a supervisory control device and a plurality of monitored control devices in a time division manner.

[0002]

2. Description of the Related Art In a conventional supervisory control system, a supervisory controller polls a monitored controller, and when the supervisory controller receives a control signal from the supervisory controller, the supervisory controller receives a previous data signal from the supervisory controller. The method was to send data regardless of whether the status changed from the current time.

[0003]

As described above, according to the conventional supervisory control method, data is transmitted regardless of whether or not the status of the subject apparatus changes. Therefore, the supervisory control apparatus changes all monitored control apparatuses. There is a drawback in that data that does not have to be acquired and processed.

[0004]

According to the supervisory control method of the present invention, a supervisory controller sends a time division data transmission request signal to a plurality of supervised control apparatuses, and the supervised control apparatus sends time-divided data. In the supervisory control method of receiving a signal, the monitored control device stores a response signal to a previous data transmission request from the supervisory control device, and when the data transmission request at the present time is received, the previous storage data is stored. A comparison is made to determine whether the current state and the current state match, and when they match, the data indicating that the state has not changed is transmitted, and when the state changes, the data indicating the state of the own device is transmitted.

[0005]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. Figure 1
In the above, the monitoring control device 1 has a function of monitoring and controlling the monitored control devices 2 and 3 through the communication line 8 and transmitting and receiving data required for the monitoring control in a time division manner. , A data transmission unit 4 having a different address number and communicating with the monitoring control device 1, and a data selection unit 5 comparing the previous data state of the device itself with the current data.
A storage unit 6 for storing the state of the collected data, and a receiving unit 7 for receiving a data transmission request signal of the monitoring control device 1. FIG. 2 is a time chart showing a main part of one embodiment of the present invention. FIG. 2A shows control signals R2 and R3 of a data transmission request transmitted from the monitoring controller 1 to the monitored controllers 2 and 3. Here, the data transmission request is 1
Control signal R2 (1), depending on how many times from the second time onwards
R2 (2) to R2 (4). FIG. 2B shows a response signal D2 transmitted from the monitored control device 2 to the monitoring control device 1. FIG. 2C is a timing EVENT1 indicating a state change of the monitored control device 2. FIG. 2D shows a response signal D3 transmitted from the monitored control device 3 to the monitoring control device 1. FIG. 2E shows the monitored control device 3
It is timing EVENT2, 3 indicating the state change.
Here, the response signal D2 (N) and the response signal D3 (N) represent R2 (N), which represents the state of the device, which is transmitted from the monitored control devices 2 and 3 to the monitoring control device 1 when the state of the device changes.
A response signal to R3 (N), I2 (N), I3
(N) is a response signal transmitted from the monitored and controlled devices 2 and 3 indicating that there is no state change when the state of the device does not change. First, the supervisory control device 1 transmits the control signal R2 (1) for the first time to the monitored control device 2. next,
The control signal R3 (1) is transmitted to the monitored control device 3, and then the control signal R2 is sequentially transmitted to the monitored control device 2.
(2) is transmitted. Next, the operation of transmitting the control signal to the monitored and controlled device 3 is repeated. The monitored and controlled device 2 receives the control signal R2 (1) and transmits the response signal D2 (1). Next, when the control signal R2 (2) is received and there is no state change compared with the state at the time of the previous response, I2
(2) is transmitted. Next, the control signal R2 (3) is received, and the response signal D2 (3) is transmitted because the state has changed due to EVENT1 as compared with the state at the time of the previous response. Next, the control signal R2 (4) is received, and since there is no state change compared with the state at the time of the previous response, I2 (4) is transmitted.
The monitored control device 3 receives the control signal R3 (1) and transmits the response signal D3 (1). Next, the control signal R3 (2)
Is received and compared with the state at the time of the previous response, EVENT2
Therefore, the response signal D3 (2) is transmitted because of the state change. Next, since the state is changed again by EVENT3, the response signal D3 (3) is transmitted. This operation is repeated.
Here, the monitored and controlled device is composed of two units, but it can be realized even if the number of units is increased.

[0006]

As described above, according to the present invention, when the monitored control device receives a data transmission request from the monitoring control device, it is possible to determine whether the stored state and the current state match. By performing, and having a function of transmitting data indicating that there is no change in state when they match, and transmitting data indicating the state of the own device when there is a change,
The processing time of the monitoring control device can be shortened. Therefore, there is an effect that the load on the monitor control device can be reduced.

[Brief description of drawings]

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

FIG. 2 is a time chart of signals in this embodiment.

[Explanation of symbols]

 1 Monitoring Control Device 2, 3 Monitored Control Device 4 Data Transmission Section 5 Data Selection Section 6 Storage Section 7 Reception Section 8 Communication Line

Claims (1)

[Claims] 1. A supervisory control system in which a supervisory control device sends a time-division data transmission request signal to a plurality of supervised control devices and receives a time-division data signal from the supervised control devices, The control device stores the response signal to the previous data transmission request from the monitoring control device, and when the current data transmission request is received, whether the previously stored state and the current state match or not is received. A supervisory control method characterized by performing comparison judgment and transmitting data indicating that there is no change in state when they match and transmitting data indicating the state of the device itself when they change.