JPS5972291A - Remote supervisory and controlling equipment - Google Patents

Abstract

PURPOSE:To reduce the number of connections wiring between a receiver and a control board by outputting an encoding control signal from the receiver to the control board, as it is, without decoding, and decoding it at the control board. CONSTITUTION:When a control switch corresponding to a remote equipment to be controlled is operated on a remote control panel 1, the swtich signal is transmitted from a master station 2 to a slave station through a transmission line 6. The encoding control signal from the master station is received by the receiver 7a of the slave station, demodulated by a demodulator 8, and converted into parallel codes by a series-parallel converter 9. The parallel signal is the encoding control signal generated by the encoder 3 of the transmitter of the master station and passed to a decoder 10, thereby reducing the number of connections. The decoder 10 of the control board 12a decodes the encoding control signal and outputs the contact output 11 of every control item. A master/ slave station control switch 13 connects the contact output 11 to the equipment 15 to be controlled in master-station mode.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote monitoring and control device that monitors and controls valves and the like located at a remote site from a control room.

A conventional device of this type is shown in FIG. In the figure, (1) is a remote control console in the control room, (2) is a transmitter in the control room, (3) is an encoder, (4) is a parallel-to-serial converter, (5) is a modulator, and the above are the master station. Configure. (6) is a transmission path connecting a master station and a remote slave station, and the slave station is composed of the following. (7) is the receiving device in the remote slave station, (8) is the demodulator, (9) is the serial-to-parallel converter, 0Q is the decoder, αυ is the control output contact, and (6) is the control panel in the remote slave station. , H is a master station/slave station control switch, (14) is a control output contact on the control panel α, and θ9 is an operating device such as a valve.

Next, the operation will be explained. When the remote control console (1) operates a control switch (for example, valve 1, open, 9, etc.) corresponding to the remote device to be controlled, the switch signal is activated by the encoder (3) in the transmitter (2). Encoded into a coded control signal. This encoded control signal is transmitted to the parallel-to-serial converter (4)
is converted into a serial code by and modulated by a modulator (5),
The signal is transmitted to the slave station via the transmission path (6). In the receiving device (7) of the slave station, the demodulator (3) demodulates the received signal, the serial-to-parallel converter (9) converts the encoded control signal back to parallel code, and the decoder 01 converts the encoded control signal into a parallel code. It decodes and outputs the individual contact output αυ for each operating device corresponding to the switch signal from the remote control console (1) to the control panel Q9. If the control panel (master station/slave station control switch time is set to the master station side), the contact output from the receiving device (7) is given to the operating device a9,
Opening and closing control of valves, etc. is performed. If the switch 0 is on the slave station side, the control contact output (14) is given to the operated device 09 by the switch operation of the control panel (6) in the slave station, and the opening of the valve, etc. , closing control is performed. Note that a remote monitoring and control device generally has a function of also transmitting a monitoring signal from a slave station to a master station, but this is omitted here for convenience of explanation.

As mentioned above, conventional remote monitoring and control devices connect control outputs individually for each control item of each operated device between the receiving device and the control panel at the slave station, so there are many operating devices. In this case, the disadvantage is that the number of wires connecting the receiving device and the control panel becomes extremely large.

This invention was made with the purpose of eliminating the drawbacks of the conventional ones as described above.The receiving device outputs the encoded control signal as it is to the control panel without decoding it, and the control panel decodes it. The object of the present invention is to provide a remote monitoring and control device that can reduce the number of wires connecting a receiving device and a control panel.

An embodiment of the present invention will be described below with reference to the drawings. Second
In the figure, (7a) is a receiving device in a slave station, which is composed of a demodulator (8) and a serial-to-parallel converter (9).

(12a) is a control panel of the slave station, which is composed of a decoder 00, a control output contact θυ, a master station/slave station control switch 0], and a control switch output Q.

Next, the operation of the embodiment will be explained.

Since the master station is the same as the conventional device, only the slave station will be described. The encoded control signal transmitted from the master station is received by the receiving device (7a) in the slave station via the transmission path (6). First, a demodulator (8) demodulates the signal, and a serial/parallel converter (9) converts the code into parallel. This parallel signal is an encoded control signal created by the encoder (3) of the transmitter (2) in the master station, and for example, as shown in FIG.
If the operation is 2 digits, the 10th place is 5 bits, the 1st place is 5 bits, and the control content (open/close code) is 8 bits, making a total of 18 bits. - As an example, the encoded control signal for opening the 51st valve is 01010110
It becomes 00110. Therefore, by passing this encoded control signal to the control panel (12a), when there are many control equipment items, it is possible to greatly reduce the number of connected devices. As an example 1
When controlling the opening and closing of 00 operating devices, conventional equipment requires 100 x 2 (open/close) books;
In this embodiment, 18 bits correspond to the number of bits of the encoded control signal.
A book is fine (except for the common line for control). The decoder Q of the control panel (12a) decodes the encoded control signal of the old iron and outputs the contact output αη for each control item. When the master station/slave station control switch (13) is in the master station mode, the output of the contact output (11) is connected to the operated device αV, such as a valve, for control.

If the master station/slave station control switch 03 is in the slave station mode,
The control switch output (14) of the control panel (12a) is connected to the operated device 09, and the control switch 041 of the control panel (12a) is enabled.

Moreover, if there is a signal error between the receiving device (7a) and the control panel (12a), the error control at this time can be prevented. This is because, as shown in Fig. 8, each code necessarily has two Il+ in the encoded control signal, so the decoder checks this encoded control signal, and if 111 is 2
If these conditions are not satisfied, the control is locked, which can prevent erroneous signals.

The remote monitoring and control device shown in Fig. 1 performs incorrect control if a signal error occurs in the connection line connecting the receiving device (7) and the control panel @. The supervisory control device is equipped with a decoder O0, which has a function of detecting errors in encoded control signals, on the control panel (12a), so the signal is not transmitted through the connection line between the receiving device (7a) and the control panel (12a). Even if an error occurs, incorrect control will not occur.

In the above embodiment, the encoded control signal is as shown in FIG.
Although an 18-bit configuration is shown, even if the configuration differs depending on the control content of the operated device, the same effect as in the above embodiment can be achieved even if the number of connections corresponds to the number of bits.

Further, as long as the method of configuring the encoded control signal is such that signal errors can be detected during decoding, the same effects as those of the above embodiments can be achieved.

As described above, according to the present invention, the control panel is configured to decode the coded control signal received by the receiving device of the slave station, thereby reducing the number of connections between the receiving device and the control panel. This has the effect of providing a remote monitoring and control device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional remote monitoring and control device, FIG. 2 is a block diagram showing an embodiment of the remote monitoring and control device according to the present invention, and FIG. 3 is a block diagram showing an embodiment of the encoded control signal. It is a code diagram. In the figure, (1) is a remote control console;
<24 is a transmitter, (3) is an encoder, (4) is a parallel/serial converter, (5) is a modulator, (6) is a transmission line, (7a)
is the receiving device, (8) is the demodulator, (9) is the serial/parallel converter, θ0 is the decoder, αυ is the contact output, (12a) is the control panel, (1 sword is the master station/slave station control switch , 04) are output contacts, and α9 is an operated device. Further, (1) to (5) constitute a master station, and (7a) to a9 constitute slave stations. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Shin Kuzuno - No. 11'4+ Fig. 2

Claims (2)

[Claims] (1) In a remote monitoring and control device that receives encoded control signals from a master station at a receiving device of a slave station and monitors and controls multiple operated devices of the slave station through a control panel, the encoded control signal received by the receiving device is A remote monitoring and control device characterized in that a control signal is decoded by a decoder provided on the control panel and is applied to an operated device specified by the encoded control signal. (2) The remote monitoring and control device according to claim 1, wherein the decoder detects a signal error contained in the encoded control signal.