JPS6366473B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centralized supervisory control system including a computer in the system, and particularly to an improvement in the delivery method of selective control data between the computer and a control center side supervisory control device.

In conventional centralized monitoring and control systems, when the control center side selects one controlled device, a code necessary only for selecting the individual device (hereinafter referred to as a selection code) is first transmitted, and The control center receives this selection code and transmits back to the control center using an information bit (hereinafter referred to as "selection completion") indicating that the individual device selection operation has been completed. Next, on the control center side, after confirming the completion of this selection, the code (hereinafter referred to as control code) required for the next step, the command for turning on/off control of individual equipment, is transmitted, and the controlled station side The order sequence is set so that the control code can be output only when the above-mentioned selection completion conditions are met.

By the way, such an order sequence is usually called two-behavior selection control. The same is true when centrally monitoring and controlling a large number of controlled stations from one control station, but the procedure for transmitting control information is simplified to avoid complicating the entire logic section. For example, codes are configured so that the control information is the same for all controlled stations, making it easy to unify transmission equipment and realize sequences when there is an interlock between controlled stations.

However, there are cases where arbitrary controlled stations are selectively controlled at the same time from multiple control consoles (including CRTs) on the control center side, and the transmission code configuration of each controlled station is different. In,
Interlocks to prevent detailed control errors are virtually impossible due to the amount of hardware, maintenance, and reliability.

An object of the present invention is to provide a monitoring and control system that can centrally monitor and control a plurality of groups of controlled stations with different code configurations with high reliability.

In order to achieve the above object, the present invention connects a computer equipped with peripheral devices such as a control console and CRT, and a remote control device on the control center side, which is installed opposite to each controlled station, via a common bus. When the necessary control information is imported from the computer to each remote control device connected to the common bus, each control stage of this control information is set to the minimum level corresponding to each stage. The control information is monitored to ensure that it does not change within the retention time, and if the content of the captured control information changes within the minimum retention time, the retention time of the relevant control stage is extended beyond the minimum retention time. The system is equipped with a means for composing a control code and transmitting it to the controlled station.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the general configuration of a centralized monitoring and control system according to the present invention. That is, as shown in the figure, a computer 3, a control console 1 and CRT 2 that input control information and monitor display information as peripheral devices, and a common bus 4 that connects the computer 3 and the control center remote control device 5.
The system is configured such that the control center remote control device 5 and a plurality of (two) controlled center remote control devices 7 are coupled via the transmission line 6. FIG. 2 shows a detailed configuration of the computer 3, the common bus 4, and the control center remote control device 5 in FIG.
, memory 11 that stores control information, external equipment and DMA (direct memory access)
It consists of a DMA I/F 12 that exchanges information in different modes. In addition, the common bus 13 is the DMA mentioned above.
The external bus of the I/F 12 is configured, and the control center remote control device includes a computer coupling device 14 and each opposing remote control device 2.
1 and 28, and a common bus 20 that interconnects these 14, 21, and 28. Here, the computer coupling device 14 is a micro CPU (hereinafter referred to as μCPU).
) 15, DMA external bus 13 → interface I/F 16, and μCPU internal bus 1
7, a buffer 18 for storing information, and an interface I/F 19 with the common bus 20. Further, each opposing remote control device 21, 28 is connected to the μCPU, an interface I/F 23 with the common bus 26, a μCPU internal bus 24, an information storage buffer 25, a modulator 26, and a demodulator 27, respectively. Configure.

Next, the operation of the centralized monitoring system configured as described above will be described with reference to the drawings. Now, when an external device on the controlled station side is selected on the control console 1 or CRT 2 shown in Fig. 1, it is imported into the computer 3 as selection information and its information as shown in Fig. 2 is selected.
It is processed by the CPU 9 and stored in the memory 11 in a predetermined code arrangement. Computer 14 connects memory 1 to DMA I/F 12 via bus 13 at I/F 16.
Outputs an access request to access memory 11, and when access becomes possible, selects information in memory 11.
In DMA mode, CPU internal bus 10, DMA
It passes through I/F 12, bus 13, and I/F 16 in that order, and then is taken into μCPU 15 via μCPU internal bus 17, where it is arranged into a predetermined code arrangement and output to I/F16.
It is output to the common bus 20 via F19. (Note that the buffer 18 is used for information processing during the above procedure.) On the other hand, the computer coupling device 14 repeatedly performs such operations periodically or at arbitrary times. Therefore, the control information taken into the computer 8 is transferred to the common bus 20 by the computer coupling device 14 with a substantially constant delay time.
is output to. The opposing remote control device 21 transfers the control information on this common bus 20 to the interface I/
It is taken in by the F23, encoded for transmission in the buffer 25 by processing by the μCPU 22, and stored.
The control information from the modulator 26 is transmitted encoded and transmitted. However, here, a minimum holding time is set corresponding to each stage of control, and the opposing remote control device 21 is set so that each stage does not change in a time shorter than the holding time.
If the content of the control information imported from the common bus 20 changes within the minimum retention time, the opposing remote control device 21 extends the retention time of the control stage and displays the selected code. is configured and transmitted. This is explained using a time chart as shown in FIG. That is, in the figure, (normal procedure) STEPA is the minimum holding time of each stage, and the non-selection control holding time t ₀ , the selection holding time t ₁ , and the control holding time t ₂ are shown, respectively. Also,
(Abnormal Procedure) STEPB indicates a case where the minimum selection holding time t ₁ cannot be secured due to a processing abnormality, and the control information is held for a time t ₁ ', which is less than the time t ₁ , and the control information changes. When controlling multiple controlled stations simultaneously from multiple control device control consoles 1, CRTs 2, etc.
The possibility that one controlled station will be selected and controlled by a plurality of control devices at the same time as in STEP B increases. And, depending on the equipment at the controlled facility,
If control codes are transmitted as in STEP B, there is a risk that abnormal processing will occur and serious control errors will occur. Therefore, in this embodiment, as shown in STEP C (correction procedure), the oncoming remote control device 21
In STEP B, the time t ₁ ′ is extended to t ₁ ″ (equal to t ₁ ′) to form a control code, and it has a logical (control) procedure to be transmitted to the controlled station device 7, and in any case The controlled station equipment 7 is also monitored to prevent it from performing abnormal processing.

As described above, according to the centralized supervisory control system having such a configuration, supervisory control devices capable of controlling a plurality of controlled stations 7 simultaneously by a plurality of control devices are connected via the common bus 20, and individual control procedures Regardless of the control status of the device 7 at the controlled station,
To realize a supervisory control system that can perform extremely reliable control even when the system configuration is unclear, since codes are determined to ensure that the control state of the controlled station does not become abnormal. be able to. This is because the common bus 20 is used in a time-sharing manner when implementing a control device by connecting the common bus 20 to simplify the configuration of a large-scale system.
This is because the above configuration makes it possible to reliably realize time coordination, which is difficult to achieve in terms of time coordination for control procedures among a plurality of controlled stations.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be similarly implemented in the following manner. For example, as shown at STEP B in FIG. In order to avoid this, the transmission code sending time is adjusted as described above, and the controller of the control signal input device (for example, the control console 1, CRT 2), that is, the computer 3,
It is also possible to input the fact that an abnormality has occurred in 8 as one of the pieces of information via the common bus, so that recovery from the abnormality and transition to prevention procedures can be quickly performed.

In addition, the present invention can be modified and implemented in various ways without changing the gist thereof.

As explained above, according to the present invention, the control console,
A computer equipped with peripheral equipment such as a CRT and a remote control device on the control center side installed opposite each controlled station are connected via a common bus, and each remote control device connected to the common bus When the necessary control information is imported into the device from the computer, it is monitored so that the individual control stages of this control information do not change within the minimum retention time set for each stage, and If the content of the captured control information changes within the minimum retention time, a means is provided to extend the retention time of the relevant control stage beyond the minimum retention time, form a control code, and transmit it to the controlled station. As a result, it is possible to provide a supervisory control system that can centrally monitor and control a plurality of controlled stations having different code configurations with high reliability.

[Brief explanation of drawings]

1 and 2 are block diagrams showing the general structure of a supervisory control system according to the present invention, and FIG. 3 is a time chart for explaining the operation in FIGS. 1 and 2. 8...Computer, 9...CPU, 10...CPU internal bus, 11...Memory, 12...DMA interface, 13...External bus, 14...Computer coupling unit, 15...μCPU, 16... External bus interface, 17...μCPU bus, 18...
...Batsuhua, 19...Common bus interface,
22...μCPU, 20...Common bus, 21...Opposite control device, 23...Common bus interface,
24...μCPU bus, 25...Batsuhua, 26...
... Modulator, 27 ... Demodulator, 28 ... Opposite control device.

Claims (1)

[Claims] 1. A monitoring and control system that monitors and controls a plurality of controlled stations from a control center, comprising: a computer equipped with peripheral equipment such as a control console and a CRT;
A remote control device on a control center side installed opposite each of the controlled stations is connected via a common bus, and necessary control information is transmitted from a computer to each remote control device connected to the common bus. Once captured, each control stage of this control information is monitored to ensure that it does not change within the minimum retention time set corresponding to each stage, and this captured control information is Supervisory control characterized by comprising means for extending the retention time of the control step beyond the minimum retention time when the content changes within the minimum retention time, constructing a control code, and transmitting it to the controlled station. system.