JPH0449798A - Remote monitoring control system - Google Patents

Abstract

PURPOSE:To execute control to an arbitrary control station to be monitored from a slave monitoring control station without transferring the initiative of interrogation by transferring a control signal from the slave monitoring control station to a master monitoring control station once and making the control executed from the master monitoring control station to the control station to be monitored. CONSTITUTION:Control from a slave monitoring control station 12 to control stations to be monitored 21 to 23 is executed through a master monitoring control station 11 without transferring the initiative of interrogation. When the control to the control station to be monitored 21 is taken for an example, the slave monitoring control station 12 adds a control code to a response signal 44 to a call signal 34 from the master monitoring control station 11 and transmits them. The master monitoring control station 11 detects that the control code is inserted into the response signal 44 and executes the control to the control station to be monitored 21 by adding the control code to a call signal 45 to the control station to be monitored 21 and transmitting them. It is the same way also on the control to the other arbitrary control stations to be monitored.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a remote monitoring and control system, and in particular, the present invention relates to a remote monitoring and control system, and in particular, an interrogation system using one carrier wave to control communication between one main monitoring and control station and a plurality of slave monitoring and control stations. This invention relates to a remote monitoring and control system that monitors and controls a plurality of monitored control stations.

[Conventional technology]

Conventionally, interrogation-based remote monitoring and control systems using a single carrier wave consist of multiple monitored control stations, one main monitoring and control station, and multiple slave monitoring and control stations, with the main monitoring and control station being the interrogation control station. It has the initiative of the game and monitors and controls the monitored control stations. For this reason, in order for a slave supervisory control station to control a monitored control station, it was first necessary to receive initiative from the main supervisory control station, and then to execute the control.

A conventional remote monitoring and control system will be explained with reference to FIGS. 3 and 4, which are system diagrams showing a remote monitoring and control system having one main monitoring and control station 11 and one slave monitoring and control station 12. 21, 22.2
3 is a monitored control station, solid lines indicate call signals, broken lines indicate response signals, and arrows indicate the direction in which the signals flow. Of these, Figure 3 shows when the main supervisory control station [1] has the initiative in interrogation, and Figure 4 shows when the slave supervisory control station 12 has the initiative in interrogation. ), FIG. 5 is a time chart showing the transmission order of call signals and response signals in this remote monitoring control system, and the horizontal axis shows the passage of time.

In FIG. 5, from the main supervisory control station 11 which has the initiative in interrogation, the monitored control station 2], 22.23
Call signals 31, 32, 33 are sequentially transmitted to the main supervisory control station 11 from the monitored and controlled stations 21, 22, 23 to which response signals 41,
42.43 is being transmitted. Through this interrogation, the main supervisory control station 11 can communicate with the monitored control stations 21 and 22.
．． Obtained 23 monitoring data. Subsequently, a call signal 34 is also transmitted from the main supervisory control station 11 to the slave supervisory control station 12, and in response, a response signal 44 is transmitted from the slave supervisory control station 12 to the main supervisory control station 11. . The main supervisory control station 11 can perform control by adding a control code to a call signal to any monitored control station and transmitting the call signal.

On the other hand, in order for the slave supervisory control station 12 to control the monitored control station, it is necessary to acquire the initiative for interrogation, and the procedure is shown below.
inserts an initiative request code into the response signal 44 directed to the main supervisory control station 11. The main supervisory control station 11 detects the initiative request signal inserted into the response signal 44, inserts the initiative activation code into the call signal 34', and transmits it again to the slave supervisory control station 12. Relinquish control of interrogation. The slave supervisory control station 12 is the main supervisory control station 1
By detecting the initiative activation code inserted in the call signal 34' from the monitored control station 2]
, , 22. Call signals 36', 37' for 23
, 38', and the monitored control stations 21, 22, 23 receive the call signals and send response signals 45', 46', 46',
47' are sequentially transmitted, and new interrogation by the slave supervisory control station 12 is activated. After the slave supervisory control station 12 acquires the initiative for interrogation, it becomes possible to execute control by adding a control signal to a call signal to an arbitrary monitored control station and transmitting it.

[Problem to be solved by the invention]

In the conventional remote monitoring control system described above, in order for the subordinate monitoring control station 12, which does not have the initiative in interrogation, to control any of the monitored control stations 21 to 23, the initiative must first be transferred. The disadvantage is that the control signal must be received from the main supervisory control station 1 and then sent to the monitored and controlled stations 21 to 23.

An object of the present invention is to provide a remote monitoring and control system that allows a slave monitoring and control station to control any monitored control station without transferring initiative for interrogation. .

[Means to solve the problem]

According to the present invention, in a remote monitoring and control method in which a plurality of monitored control stations are monitored and controlled by one main monitoring and control station and a plurality of slave monitoring and control stations using one carrier, When controlling a monitored control station, the control signal from the slave monitoring control station is once transferred to the main monitoring and control station, and the main monitoring and control station executes control on the monitored control station. It is characterized by the following.

〔Example〕

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

FIG. 1 is a system diagram showing a remote monitoring control system according to an embodiment of the present invention, and FIG. 2 is a time chart showing the transmission order of the call signal and response signal shown in FIG.

FIG. 1 shows a case similar to that in the conventional remote monitoring and control system shown in FIG. 3, in which the monitoring and control station 11 has the initiative in interrogation.

In FIG. 2, the operation of supervisory control of the monitored and controlled stations 21, 22, and 23 by the main supervisory control station 11, which has the initiative in interrogation, is the same as the conventional one. That is,
From the main supervisory control station 11, the monitored control stations 21, 22, 23
The call signals 31, . 32.33 was sent,
In response, a response signal 4 with monitoring data added from the monitored control stations 21, 22, and 23 to the main supervisory control station 11]
42 and 43 are being transmitted. Through this interrogation, the main supervisory control station] 21, the monitored control station 21.2
Obtain 2.23 monitoring data. Subsequently, a call signal 34 is also transmitted from the main supervisory control station 11 to the slave supervisory control station 12, and in response, a response signal 44 is transmitted from the slave supervisory control station 12 to the main supervisory control station 11. The main supervisory control station 11 can perform control by adding a control code to a call signal to any monitored control station and transmitting the call signal.

On the other hand, control of the monitored control stations 21 to 23 from the slave supervisory control station 12 is executed via the main supervisory control station 11 without transferring initiative for interrogation. Taking control of the monitored control station 21 as an example, the slave monitoring control station 12 adds a control code to a response signal 44 in response to the call signal 34 from the main monitoring control station 11 and transmits the response signal 44 . Main supervisory control station 11
detects that a control code is inserted in the response signal 44, adds the control code to the call signal 45 to the monitored control station 21, and transmits the control code, thereby executing the control for the monitored control station 21. . The same applies to control of any other monitored control station.

In this embodiment, a remote monitoring and control system has been described which is composed of one main monitoring and control station 11, a slave monitoring and controlling station 12, and three monitored control stations 21 to 23, but two or more slave monitoring and controlling stations In a remote monitoring control system composed of four or more monitored control stations, the operation in which control from a slave monitoring control station to a monitored control station is executed once via a main monitoring control station is the same.

〔Effect of the invention〕

As explained above, the present invention provides an interrogation initiative in a remote supervisory control system in which a plurality of monitored control stations are monitored and controlled by one main supervisory control station and a plurality of slave supervisory control stations using one carrier wave. This has the advantage that the slave supervisory control station can control any monitored control station without transferring authority.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a remote monitoring control system which is an embodiment of the present invention, Fig. 2 is a time chart showing the transmission order of the call signal and response signal in Fig. 1, and Figs. 3 and 4 are Two system diagrams show conventional remote monitoring and control systems. FIG. 5 is a time chart showing the transmission order of call signals and response signals in the conventional remote monitoring and control system. 11... Main supervisory control station, 12... Slave supervisory control station, 2
1.22.23...Monitored control station, 3], 32-3
8.34', 35', 36'~38'...Call signal, 41.42~48.45'46'48'・
...Response signal. King 1 Figure 3

Claims (1)

[Claims] In a remote supervisory control method in which multiple monitored control stations are monitored and controlled by one main supervisory control station and multiple slave supervisory control stations using one carrier wave, any slave supervisory control station can control the monitored control station. When executing the above, the control signal from the slave supervisory control station is once transferred to the main supervisory control station, and the main supervisory control station causes the monitored control station to execute control. A remote monitoring and control system.