JPS61144150A - Monitoring control system - Google Patents

Abstract

PURPOSE:To prevent the delay for receiving a control execution by sending a polling signal by a monitoring control station, receiving a polling signal by a monitored control station side and simultaneously returning a response signal for the polling signal before one period at the same timing. CONSTITUTION:A polling data signal 5 is sent from a monitoring control station 1 to monitored control stations 2-4, and simultaneously, to receive a response data signal 6 from the monitored control stations 2-4, the same signal is used for a signal 7 to sample both data signals 5 and 6 and the signal 7 is supplied from the monitoring control station. The monitoring control station 1 has a circuit to sample the response data signal 6 from monitored control stations 2-4 by a sampling signal 7. On the other hand, the poling data signal from the monitoring control station 1 is sampled at the monitored control stations 2-4, the response signal before one period synchronizes with a sampling signal and is sent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polling type supervisory control system in which a supervisory control station simultaneously transmits a polling signal and receives a response signal.

[Conventional technology]

In the conventional polling type supervisory control system, a polling signal containing a control signal for a monitored control station is transmitted, and a response signal from the monitored control station is then received in the next polling cycle.

[Problem that the invention seeks to solve]

In the conventional polling supervisory control system described above, the transmission of a polling signal including a control signal to a controlled station and the reception of a response from the controlled station are performed in different cycles. For this reason, even if the response speed from the controlled station is fast at the polling cycle, it will take two or more cycles from the time the supervisory control station sends a control signal to the time it sends the next control signal. If several controlled stations are connected, there is a drawback that acceptance of control execution is delayed.

[Means for solving problems]

The polling type supervisory control system of the present invention transmits a polling data signal from a supervisory control station to a monitored controlled station, and at the same time receives a response data signal from the monitored controlled station. The same signal is used and this signal is supplied from the supervisory control station. The supervisory control station has a circuit for sending polling data to the monitored control station and sampling a response data signal from the monitored control station using a sampling signal.

On the other hand, the monitored control station performs sampling using the polling data signal t sampling signal from the monitoring control station, and synchronizes the response signal one cycle earlier with the sampling signal.
It has a sending circuit.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

The figure is a block configuration diagram of an embodiment of the present invention, and in the figure, polling data signals 5.5' are sent from the supervisory control station 1 to the monitored and controlled stations 2 to 4, respectively.

5", response data signal to polling signal 6°6'
, 6", data sampling signal 7.7'.

7" is connected. The supervisory control station 1 supplies the sampling signal 7 together with the polling signal 5 containing the control signal to the monitored control 2. On the other hand, the monitored control station 2 supplies the sampling signal 7 with an ERI polling signal 7. At the same time as taking in the data signal 5, it sends out a response data signal 6 to the polling signal one cycle before.The supervisory control station 1 takes in the same signal as the sampling signal 7 to the monitored control station 2.

Furthermore, similar polling is performed for the monitored control stations 3 and 4 as well.

〔Effect of the invention〕

In accordance with the above-described method, in the present invention, in synchronization with the polling signal of the supervisory control station, the monitored control station sends out a response signal to the polling one cycle before, and on the other hand, the supervisory control station transmits the polling signal containing the control signal. If you send a response signal from the monitored control station at the same time, the response speed of the monitored control station becomes faster, and the monitoring control station can send a control signal every time. There is no delay in acceptance of control execution even if the connection is made.

[Brief explanation of the drawing]

The figure is a system block diagram of the present invention.

Claims (1)

[Claims] In a supervisory control method in which a monitored control station receives a polling signal from a supervisory control station and returns a response signal, the supervisory control station sends out a polling signal, and on the other hand, when the monitored control station receives the polling signal, A supervisory control method characterized in that, at the same time as the polling signal is received, a response signal to the polling signal one cycle before is sent back.