JPS58100594A - Remote output suppression device for controller - Google Patents

Abstract

PURPOSE:To prevent the malfunction of a device due to invasion of noise on a transmission line and external disturbance such as lightning surge, by providing a remote output suppression means at an output side of a remote output device. CONSTITUTION:When a start or stop instruction signal is tranamitted from a controller 1 to remote output devices 3a, 3b via signal transmitters 2a, 2b and transmission lines 4a, 4b, a suppression release signal is transmitted via a signal line 6. Thus, the function of output suppression circuit 5a, 5b is stopped and each switch is closed. Further, when the start and stop instruction signal from the controller 1 is not transmitted, since the suppression release signal is not transmitted, the function of the circuits 5a, 5b is operated. Thus, even if the devices 3a, 3b give an error signal due to external disturbance such as noise invasion and lightning surge, the device can not be malfunctioned.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for centrally controlling a large number of machines S,
In particular, the present invention relates to the remote output suppressing device.

tmth, a schematic configuration of a conventional control device that centrally controls on/off of a large number of devices is shown. In the figure, l is a control device,
21 to 2!1 are signal transmission devices, 31 to 3 are remote output devices that output ON/OFF signals of the respective target devices, and 4a to 4n are multiplex transmission lines.

A device on/off command inputted from the control device 1 to, for example, the signal transmission device 2a on the transmitting side is converted into a serial signal and then sent to the remote output device 3& after passing through the multiplex transmission path 4a.

The serial signal output device 3a restores the received serial signal to a parallel signal 4, and outputs it in response to the ON/OFF commands of each device connected to its output side.

Exactly the same input/output is applied to other signal transmission devices on the transmitting side.
OFF control is performed.

As described above, when transmitting control signals for starting and stopping a large number of machines S, a pulse-like ON signal of several seconds is generally used as the starting or stopping command signal.

Therefore, the time period during which a signal is input to the signal transmission device 2 a = 2 n on the transmitting side is only for a few seconds when starting or stopping the equipment, and during most of the remaining time period, no signal is received. It is in a state where it is not input.

For example, when starting and stopping 10 devices once a day using a 1 second pulse signal, the time period during which the signal is input to the signal transmission device is +1 stop) x 1 second XIO units - 20 seconds.

That is, the proportion is of the hour of the day, 0.0g3
It's just -. During the remaining time i19.977-, no signals are transmitted to the multiplex transmission lines 41 to 4n.

By the way, as is well known, in general, noise often enters the transmission path, and this noise is transmitted to the basket output lines 98a to 3n and is not output. If such a situation occurs, the controlled equipment will be turned on and off due to the incorrect output.

It is clear that if an erroneous signal due to noise or the like is output and the IIl control is executed based on this, various inconveniences will occur, and in some cases, it may be extremely dangerous.

For example, using signal multiplexing equipment to start up distant equipment,
In the case of stopping, the receiving side of the transmission device recognizes noise etc. as data of a starting or stopping command even though the transmitting side does not issue a starting or stopping command.
The equipment may start or stop immediately after the 11 output is output.

In order to improve the above-mentioned problems caused by noise during WAIlli1 production, various data checking methods have been proposed, and some of them have already been implemented.

However, if damage to the semiconductor occurs due to damage, there is still a possibility that the 'CII signal will be transmitted and output via the transmission line.

The present invention has been made in order to eliminate the above-mentioned inconveniences, and its purpose is to provide a control device in which a remote output device can output data only when data is input from the transmitting side. An object of the present invention is to provide a Noriho-to-dekana press device.

In order to achieve the above object, the present invention provides a method for suppressing the output of the output device of the remote output device.
A means is provided to disable all outputs of the remote output device at all times, and only when data is transmitted from the transmitting side, the function of the press (inhibition) means is stopped and the output is "enabled". are doing.

The present invention will be described in detail below with reference to the drawings.

FIG. 2 is a diagram of an embodiment of the present invention, in which the same reference numerals as in Figure 1 of the chicken are the same, and 9 represents the same age as Oka.

6m! sks is remote output connection 1. , 3b are output press circuits, and 6 is a press release signal line for transmitting the henna press release number to the control device 1.

From the control value at, a start or stop command signal is transmitted to the remote output stations 3a, 3b via the signal transmission devices 2*, 2b and the transmission lines 4a*4b, and at the same time, a suppression release signal is transmitted. It is transmitted via the signal line 6.

As a result, the function of the output kana press circuit 5ae5b is stopped. That is, in the example of this figure, each switch is W
It is assumed to be in A state.

On the other hand, when the start 1 m/stop command signal from the control device 1 is not transmitted, the sag cancel signal is also not transmitted. Therefore, in this tortoise, the functions of the output nap Vs circuits 1a and Sb are utilized.

That is, in the example shown in this figure, each switch is in the negative state, and even if the basket output device produces an output, these outputs are prohibited from being supplied to the respective controlled devices.

Therefore, due to noise contamination and surges during transmission,
Therefore, even if the remote output devices 3m and 31b output an erroneous signal, this will cause the corresponding device to start,
You will no longer be suspended.

Figure 3 is a block diagram of a main part of another embodiment of the present invention, and is an example in which an output kana press circuit is provided in each remote output device 3i of Figure 2.

In the figure, 31 is a waveform shaping circuit, 3 is a serial-to-parallel conversion circuit, 33 is a synchronization signal detection circuit, 34 is a reception control circuit, 31 is a register, and 36a.

36b...-36m are relay output jumps, and 3 are suppressor circuits.

The multiplexed transmission signal from the control device 1 is shaped by the waveform channel 31. The shaped reception signal is decomposed into parallel output signals by the serial-to-parallel conversion circuit 32, the synchronization signal detection circuit 33, and the reception control circuit 34 using the usual method, and is outputted to the register 35 at the subsequent stage as output information. C is paid.

The contents of the register 35, that is, the output information, are transferred from the relay paths 36 and 36 to the respective corresponding devices.

In this embodiment, the register 3s and each relay output circuit! 6
An output suppress circuit 37 is provided between 1 and 36n. As is clear from the figure, the output suppress circuit 37 is composed of an input circuit that receives the contents of the register (output information) and an inverted signal of the press signal. Similarly, the sagress signal 8G
While the input signal is being supplied from the control circuit 1m, each AND gate is closed, so the contents of the register are not output.

This suppress circuit is the relay output circuit 3 of the shrimp I/I & stage.
This can be easily realized by adding 6 gate elements to the front stage of 61 to mim. The cost increase due to this addition is generally limited to the increase in the gate element, as the entire circuit is mounted on the printed circuit board at once, and has almost no effect on the overall iron load. .

As is clear from the above description, according to the present invention, when no control command is output from the control device on the transmitting side,
Since the output of the remote output device on the receiving side is reliably prevented from being transmitted to the controlled device all at once, it is possible to reliably prevent the device from being erroneously operated due to a single signal such as noise. , the reliability of the control system can be improved.

[Brief explanation of the drawing]

Fig. 1 is a 1971 diagram of a conventional control device, Fig. 2 is a schematic diagram of one embodiment of the present invention, and Fig. 5lii is a 1971 diagram showing main parts of another embodiment of the present invention. l...Control device, 2 m = 2 m...Signal transmission device, '31~3n...Remote output device, 4a~
4n...Multiple transmission line, 5m, 5+...Dekana press circuit, 6...Naples release signal line Daidanjinben 1st master Hiraki Michihito 21 Figure 22 Figure size 31m.

Claims (1)

[Scope of Claims] (11) A remote control device having a remote output device that receives a command signal transmitted from the control device via a transmission line, and transmits the command signal to a controlled device. The output suppressor includes an output suppress circuit that prohibits the output of the output device from being transferred to the controlled device, and the output suppressor that suppresses the output only when a command signal is transmitted from the control device. A remote output press device for a control device, characterized in that it includes a means for canceling the function of the circuit. (2) The prohibition of output transfer of the remote output device by the output suppress circuit 4C prevents the entire output of the remote output device from being inhibited. Patented mote output t7'resat0 characterized in that it is commonly performed in one batch.