JPS60136500A - Control transmitter of remote supervisory and controlling device - Google Patents

Abstract

PURPOSE:To prevent misoperation and the erroneous supervisory of an operator, and to allow early countermeasures at the time of emergency control time by providing a control data buffer in a remote supervisory and controlling device of a controlled place. CONSTITUTION:Control signals from control desks of No.1-No.n are stored sequentially in buffers 1-n, and are transmitted to a controlled place sequentially by the time period of a timer. Control signal receiving time of the controlled place where the worst case is considered accompanying with control time delay by the code error on the transmission route becomes t=74ms, and normal receiving is executed on the controlled-place side. The control signals which are received normally on the controlled place side are stored in the buffers 1-n of the control buffer sequentially, and the control signals are transmitted sequentially to objective equipments by the time period of the timer. If the timer setting time of the controlled place is 222ms, it will be suitable.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a control transmission method for a remote monitoring and control device, and in particular, it is required to control and output a plurality of control signals to a plurality of equipment to be controlled in a short time. Regarding the system to be used.

[Background of the invention]

A control transmission method of a conventional remote monitoring and control device will be explained below with reference to FIGS. 1, 2, and 3.

In FIGS. 1 and 2, control signals from the control desks 1 of &1 to An of the control center 13 are input processed by the input processing circuit 2, and then given priority by the priority processing circuit 4 via the code conversion circuit 3. Processing and sending control signals to the control data buffer 10
After being temporarily stored in the FIFO memory 15, the data is sent to the AND gate 17 while sequentially shifting the plurality of buffers 15 at a time period of [timer]6, and after being transmitted in the transmission processing circuit 5, it is sent to the parallel-to-direction conversion circuit 6. The signal is transmitted to the controlled station 14 via the signal transmission device 7. On the other hand, controlled station 1
4, the control signal transmitted from the control center 13 is inputted to the serial-to-parallel conversion circuit 9 via the signal transmission device 8, converted, and then sent to each target equipment 1 by the control output circuit 11.
It is controlled and output to 2.

Here, the control time until the control signal from the control desk 1 of the control station 13 is outputted from the control output circuit 11 of the controlled station 14 to the target equipment 12 will be explained below with reference to the time chart of FIG.

Control signals from the control desks A1 to An are sequentially stored in buffers 1 to n of the control data buffers, and are sequentially output according to the time period of the timer. Normally, the timer setting time is set to 1 second, and this 1 second is a margin due to code errors during transmission from the control center to the controlled facility, and the relay circuit from the controlled facility to the target equipment. This time is set in consideration of the time it takes to drive the motors, etc. In general,
In order to drive the relay circuit of the target equipment from the controlled station, at least t4 = O15 seconds is required, and the time t3 due to transmission error is approximately 22 seconds in the worst case at 1200 baud.
2 m5 (When receiving with 2 words/cycle x 3 cycle transmission, if there is an error in 4 consecutive cycles, transmission is locked under control as a control jam.) The time of t5 is 74 m5 (1 cycle). (if it is received correctly by eye). Therefore, t4 becomes 852 m5 in the worst case, and it can be seen that the above-mentioned timer setting time is generally appropriate.

As described above, there have conventionally been problems as shown below.

(1) Control signals - Each item is held for one second at the control center, so if there are multiple control signals, the control time becomes long, leading to erroneous operation and monitoring by operators.

(2) Recently, in the event of an emergency, it is required to send multiple control signals to multiple target equipment in the shortest possible time, and conventional control methods that take a long time cannot handle this. There wasn't.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a control transmission device for a remote monitoring and control device that prevents erroneous operations and monitoring errors by operators, and provides early response in case of emergency control.

[Summary of the invention]

In the present invention, a control data buffer is also provided in the remote monitoring and control device on the controlled center side, and the control time described above is shared.On the control center side, only the control time delay due to code errors on the transmission path is considered, and on the controlled center side, the control data buffer is also provided. By considering only the control output time for the target equipment, the control time is significantly reduced compared to the conventional control transmission method.

[Embodiments of the invention]

FIG. 4 shows a block diagram of the remote monitoring control system, and FIG. 5 shows a detailed diagram of the control data buffer. Below, FIG. 4 and FIG. 2 will be explained.

The control signals from the control desks 1 to An of the control center 13 are as follows:
After the input is processed by the input processing circuit 2, the input is processed by the Bude conversion circuit 3.
After the control signal is temporarily stored in the F'IFO memory 15 of the control data buffer 10, the multiple buffers 15 are sequentially shifted in accordance with the time period of the timer 16 and processed by an AND gate. 17, and after being subjected to transmission processing in the transmission processing circuit 5, it is transmitted to the controlled station 14 by the signal transmission device 7 via the parallel-to-serial conversion circuit 6. On the other hand, at the controlled station 14, the control signal transmitted from the control station 13 is directly transmitted via the signal transmission device 8.
After being converted by the parallel conversion circuit 9, the control signal is temporarily stored in the FIFO memory 15 of the control data buffer 10, and then sent to the AND gate 17 while sequentially shifting the buffer 15 at the time period of the timer 16, and is sent to the control output circuit. 1
1, the control signal is outputted to each target facility 12 at regular intervals.

Here, the control time until the control signal from the control desk 1 of the control station 13 is outputted from the control output circuit 11 of the controlled station 14 to the target equipment 12 will be explained below with reference to the time chart of FIG.

The control signals from the control desks A1 to AH are sequentially stored in buffers 1 to 7n of the control data buffer of the control station, and are sequentially sent to the controlled station according to the time period of the timer. Here, the timer setting time t6 is 222m5
(When receiving 2 words x 3 cycles at 1200 baud).

On the other hand, considering the worst case of control time delay due to code m on the transmission path, the control signal reception time of the controlled station is t@ = 7
4ms (to = 222ms in normal case),
The controlled station side can normally receive the information. On the controlled site side, the normally received control signals are sequentially stored in buffers 1 to n of the control data buffer, and the control signals are sequentially sent to the target equipment according to the time period of the timer.

Here, the set time tto of the timer is assumed to be 5 ooms, considering that it is the time to drive the relay circuit of the target equipment.

Comparing the control times of the conventional method and the present invention method from the above, (time until A and B control ends) (1) Conventional method 'r+ = "+ 10" 2 + t3 + t4 (2) Invention method T2 =ts +4+oX2+tl, TI=
2084 m s T2 ''1232 m5 Since TI>T2, this means that the control time is much shorter than the control time in the conventional control method.

〔Effect of the invention〕

According to the present invention, it is possible to greatly shorten the time required for multiple control signals, thereby making it possible to prevent erroneous operations and monitoring by operators, and to take early action in case of emergency control.

[Brief explanation of drawings]

Figure 1 is a block diagram of a conventional remote monitoring and control system, Figure 2 is a block diagram of a conventional remote monitoring and control system.
3 is a detailed diagram of the control data buffer, FIG. 3 is a conventional time chart, FIG. 4 is a block diagram of the remote monitoring and control system of the present invention, and FIG. 5 is a time chart of the present system. DESCRIPTION OF SYMBOLS 10... Control data buffer, 11... Control output circuit, 12... Target equipment, 13... Control center, 14...
- Controlled station, 15...F'IFO memory, 16-mount timer, 17...AND gate, 18...falling differentiation circuit. Agent Patent Attorney Akio Takahashi

Claims (1)

[Claims] 1. A control transmission device for a remote monitoring and control device that is controlled simultaneously from a plurality of control desks, characterized in that a control data buffer is provided in the remote monitoring and control device of a controlled station. Control transmission device for control device.