JPH0116078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote monitoring and control system for remotely controlling from a control center controlled devices that are controlled on and off and controlled continuously that are mixed in a controlled facility.

FIG. 1 shows an example of the configuration of a general remote monitoring and control device. In FIG. 1, 1 is a selection switch, 2 is a control switch, 3 is a control input section, 4 is a transmitting section, and 5 is a control switch.
6 is a signal transmission section, 6 is a communication line, 7 is a reception section, and 8 is a control output section.

Since the operation of such a remote monitoring and control device is well known, its explanation will be omitted.

By the way, in a controlled station, there are both controlled devices that are simply turned on and off and controlled devices that are continuously controlled, in which the control amount is continuously adjusted. In such a case, a selection control signal including a selection signal and a control signal for the controlled device is transmitted from the control station to the controlled station to control the corresponding controlled device. Note that for controlled devices that are continuously controlled, the control amount is sent to the control center and displayed on the indicating instrument, and the operator transmits the control signal while looking at the indicating instrument.

An example of a conventional remote monitoring and control device will be explained with reference to FIG.

A selection control signal 9 from a control center is received by a receiving circuit 10 and separated into a selection signal 11 and a control signal 12.
The selection signal distribution circuit 13 operates the selection relay 17 of the controlled device selected by the selection signal 11. By the operation of the selection relay 17, the on contact 23, the off contact 24, the stop contact 25, the increase contact 26, and the decrease contact 27 of the controlled device are closed.

On the other hand, the decoder 14 decodes the control signal 12 sent as a 3-bit code signal as shown in FIG. 2, for example. When the control signal 12 is an ON control signal, an OFF control signal, or a STOP control signal, the control signal 12 is output for a certain period of time (for example, 1
A pulse signal (seconds) is applied to the control distribution circuit 16.
The control distribution circuit 16 operates the input auxiliary relay 18 when there is an input control signal, operates the cut-off auxiliary relay 19 when it receives a cut-off control signal, and operates the stop auxiliary relay 20 when it receives a stop control signal. Decoder 14
is directly applied to the control distribution circuit 16 when the control signal 12 is an increase control signal or a decrease control signal. The control distribution circuit 16 operates the increase auxiliary relay 21 when the increase control signal is present, and operates the decrease auxiliary relay 22 when the decrease control signal is present. Auxiliary relay 18-2
The input control signal, cut-off control signal, stop control signal, increase control signal, and decrease control signal by 2 are sent to the contacts 23 to 27 of the selection relay 17 of the selected controlled device.
is added to the controlled device via the

Although the conventional remote monitoring and control device controls the controlled equipment as described above, the selection relay 17 requires five output contacts. This is to ensure that the selection relay is used as a standard even if the controlled devices include those that are controlled on/off and those that are continuously controlled. Furthermore, the conventional device also requires five auxiliary relays that output control signals.
As described above, as the number of output contacts of the selection relay and the number of auxiliary relays that output control signals increase, the mounting area of the relay increases and the number of wires also increases.
For this reason, the conventional device has a disadvantage in that it becomes disadvantageous in terms of cost when the number of controlled devices is large.

The present invention has been accomplished in response to the above-mentioned problems, and its purpose is to provide a remote monitoring and control system that can reduce costs and improve reliability.

The present invention is characterized by determining whether the control mode is ON/OFF control or continuous control based on the selection signal of the controlled device, and depending on the determination result, the control output switching means performs ON/OFF control of pulse output or continuous control. The reason is that the continuous output to be controlled is switched.

FIG. 4 shows an embodiment of the present invention.

In FIG. 4, the same symbols as in FIG. It is. The calculation unit 29 determines the control mode of the selected controlled device based on the selection signal 11, and outputs a "1" level signal for continuous control and a "0" level signal for on/off control. The control output switching circuit 30 provides the continuous control signal from the decoder 14 to the control distribution circuit 16 when the output signal of the calculation section 29 is at the "1" level, and supplies the continuous control signal from the decoder 14 to the timer circuit 15 when the output signal of the calculation section 29 is at the "0" level. An on/off control signal is given to the control distribution circuit 16. Note that the stop control signal is sent to the timer circuit 15.
to the control distribution circuit 16 directly. The selection relay 17 has three contacts 23 to 25. The contact 23 is for turning on and increasing, the contact 24 is for cutting and reducing, and the contact 25 is for stopping. In addition, the auxiliary relays that send control signals include the input/increase auxiliary relay 18,
Cut/decrease auxiliary relay 19 and stop auxiliary relay 2
It has become 0 and 3 units.

Next, the operation will be explained.

A selection control signal 9 from a control center is received by a receiving circuit 10 and separated into a selection signal 11 and a control signal 12.
The selection signal distribution circuit 13 operates the selection relay 17 of the controlled device selected by the selection signal 11. The operation of the selection relay 17 causes the on/increase contact 23, off/decrease contact 24, and stop contact 25 of the controlled device to close. The selection signal 11 is also input to the calculation section 29 . The calculation unit 29 receives the selection signal 11
The control mode of the selected controlled device is determined based on the setting data of the control method setting circuit 28. When the control mode of the selected controlled device is continuous control, the calculation unit 29 outputs a “1” level signal;
In the case of on/off control, a "0" level signal is output.

On the other hand, the decoder 14 decodes the control signal 12 sent as a code signal. control signal 12
When it is an input control signal or a disconnection control signal, it is applied to the control output switching circuit 30 via the timer circuit 15. Further, the decoder 14 supplies the control signal 12 to the control output switching circuit 30 when the control signal 12 is an increase control signal or a decrease control signal. The control output switching circuit 30 outputs a continuous control signal (increase control signal or decrease control signal) when the output signal of the calculation unit 29 is at the “1” level.
When the output signal of the arithmetic unit 29 is at the "0" level, it becomes possible to output an on/off control signal (an on/off control signal or an off control signal).

Now, if the controlled device selected by the selection signal 11 is to be controlled on/off, and the control signal 12 is an input control signal, the pulse signal of the timer circuit 15 is passed through the control output switching circuit 30 to the control distribution circuit 16. given to. Control distribution circuit 16 operates auxiliary relay 18 only while the pulse signal is applied. At this time, the selection relay 17 of the controlled device selected by the selection signal 11 operates, and its contacts 23 to 25 are closed. The input control signal given by the operation of the auxiliary relay 18 is given to the controlled device via the contact 23. As a result, the input operation of the selected controlled device is performed. Similarly, when the control signal 12 is an off control signal, the auxiliary relay 19 operates and the signal is applied to the selected controlled device via the contact 24 of the selection relay 17.

Next, it is assumed that the controlled device selected by the selection signal 11 is continuously controlled and the control signal 12 is an increasing control signal. In this case, the increased control signal decoded by the decoder 14 is given to the control distribution circuit 16 via the control output switching circuit 30. Control distribution circuit 16 operates auxiliary relay 18 .
The increased control signal due to the operation of the auxiliary relay 18 is applied to the selected controlled device 17 via the contact point 23 of the controlled device 17 . As a result, if the controlled device is, for example, a valve, it is opened. The control amount of the controlled equipment is usually transmitted to the control center and displayed on the indicating instrument. The operator continues to send incremental control signals while looking at the indicator. When the control amount of the controlled device reaches a desired value, an operator at the control station transmits a stop control signal as the control signal 12. The stop control signal decoded by the decoder 14 is converted into a pulse signal with a constant time width by a timer circuit 15 and is then applied to a control distribution circuit 16. Control distribution circuit 16 operates auxiliary relay 20 . A stop control signal generated by the operation of the auxiliary relay 20 is applied to the controlled device via the contact 25 of the selection relay 7, and the increasing operation of the controlled device is stopped. Conversely, when the control signal 12 is a reduction control signal, the auxiliary relay 19 operates to perform a reduction operation of the controlled device.

The controlled device is controlled as described above, but since the selection relay contacts are shared for on/off control and continuous control, the selection relay can have three contacts and also output control signals. The number of auxiliary relays can be reduced to three. Therefore, the selection relay can be made smaller and the number of auxiliary relays for control signals can be reduced. Therefore, it is possible to reduce costs by improving mounting efficiency, improving reliability by reducing wiring work, and reducing labor costs.

As explained above, according to the present invention, it is possible to reduce the cost and improve the reliability of a remote monitoring and control device.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a general remote monitoring and control device, Fig. 2 is a diagram showing an example of a code signal of a control signal, Fig. 3 is a block diagram of a conventional device, and Fig. 4 is a diagram showing an example of an embodiment of the present invention. FIG. 10... Receiving circuit, 11... Selection signal, 28...
...Control method setting circuit, 29...Calculation section, 30...
Control output switching circuit.

Claims (1)

[Claims] 1. In a device that controls controlled devices that are controlled on and off and that are controlled continuously that are mixed in a controlled facility by transmitting a selection control signal from the control center, the selection control signal received at the controlled facility The control mode of the controlled device selected by the control mode stored in the control mode setting means is determined based on the signal selection signal, and the control output switching means performs on/off control according to the determination result. A remote monitoring control method characterized by switching between output and continuous output.