JPH0716276B2 - Emergency stop method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an emergency stop system for various control devices.

(Conventional Example) FIG. 4 shows an emergency stop system used in a conventional remote control system.

The operation switch 13 can create information by combining a plurality of switches and can give the information to the P / S conversion circuit 11. The power supply circuit 15 can supply an operating voltage to the P / S conversion circuit 11. The P / S conversion circuit 11 is a circuit that reads information from the operation switch 13, adds redundant bits, and outputs the serial data.

The S / P conversion circuit 23 is a circuit that outputs serial inputs in parallel. The control switch 27 and the normal transmission switch 31 respond to the control relay 25 and the normal transmission relay 26, respectively. The control relay 25 is relay-controlled by the information corresponding to the operation switch 13 and operates the controlled device connected to the output terminal 29 if there is no error in the inspection using the redundant bit.

The normal transmission relay 26 is turned on if there is no error in the inspection result of the transmitted information.

Now, when the emergency stop switch 15d of the power supply circuit 15 performs an emergency stop operation at the timing t1 in FIG. 3 (a), the discharge of the capacitor 15c is started and the voltage having the waveform as shown in FIG. 3 (b) is used as the power supply voltage. , P / S conversion circuit 11. P
Assuming that the minimum operating voltage of the / S conversion circuit 11 is point A in FIG. 3 (b), the serial data in FIG. 3 (c) is transmitted up to point A, that is, data D7 is transmitted. Then stop.

On the other hand, on the receiving side, when the information is interrupted or when a data transmission error is detected, the transmission normal relay 26 turns off the transmission normal switch 31, and the output terminal 29 is connected to the output terminal 29 regardless of the state of the control switch 27. Information “0” is available. Therefore, when the information is interrupted at the point A or the transmission error of the data D7 is detected as described above, the transmission normal relay 26 is turned off and the control output is cut off as shown in FIG. 3 (e). .

(Problems to be Solved by the Invention) In the conventional emergency stop system as described above, it takes time from the execution of the emergency stop operation to the actual stop of the controlled object, which is dangerous.

Therefore, an object of the present invention is to provide an emergency stop system capable of promptly stopping a controlled object in an emergency by automatically transmitting an emergency stop signal during an emergency stop operation.

[Structure of the Invention] (Means for Solving the Problem) On the transmitting side, an information transmitting means for transmitting switch information, and an operating power supply voltage supplied to this information transmitting means, and by operating an emergency stop switch, A power supply circuit that gradually lowers the power supply voltage and a receiving side that receives information from the information transmission means and performs error checking, and if there is no error, obtains a control output to the controlled device In the case of an emergency stop system including an information receiving unit that disconnects all the control outputs, if there is, an emergency stop information is input to the information transmitting unit in association with an emergency stop operation of the emergency stop switch. And a means for forcibly turning off all the control outputs when the emergency stop information is detected even when the information receiving means has no error.

(Operation) The emergency stop system of the present invention can promptly stop the controlled object in an emergency by inputting an emergency stop signal during an emergency stop operation.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

The input terminals of the P / S conversion circuit 57 have multiple operation switches 51
Are connected in parallel, and the output terminal of the power supply circuit 55 is connected to the power supply terminal. DC power supply 55 that constitutes the power supply circuit 55
For b, the negative terminal is grounded and the positive terminal is the emergency stop switch 53
Of the movable terminal c. One fixed terminal b of the emergency stop switch 53 is connected to one of the information input terminals of the P / S conversion circuit 57. Further, the other fixed terminal a of the emergency stop switch 53 is connected to the input terminal of the stabilized power supply 55a. Further, the other terminal of the capacitor 55c, one of which is grounded, is connected to this input terminal. The output terminal of the stabilized power supply 55a is connected to the P / S conversion circuit 57.

The output terminal of the S / P conversion circuit 59 is connected to the plurality of control relays 61, and the specific first output terminal is connected to the set terminal of the latch circuit 67. The specific second output terminal of the S / P conversion circuit 59 is connected to the normal transmission relay 65 and also to the reset terminal of the latch circuit 67 via the inverting buffer. The output terminal of the latch circuit 67 is connected to the emergency stop output relay 63. One of the plurality of control switches 69 is connected to the control output terminal 75, and the other is connected to the common terminal 76 (power supply terminal) via the transmission normal switch 71 and the emergency stop output switch 73 in series.

Next, the operation will be described.

When the operation switch 51 is operated, its output is input to the P / S conversion circuit 57 as switch combination information. Since the emergency stop switch 53 normally selects the fixed terminal a, the DC power supply 55b is connected to the stabilizing power supply 55a.
Therefore, the power supply circuit 55 can supply the operating voltage to the P / S conversion circuit 57. However, when the emergency stop switch 53 is operated in an emergency and the fixed terminal b is selected, the output from the fixed terminal b is the P / S conversion circuit 5 as the emergency stop information.
Can be entered in 7. In this way, even if the emergency stop switch 53 is switched, the P / S
The conversion circuit 57 operates normally for a while.

Therefore, the P / S conversion circuit 57 immediately transmits the emergency stop information when the emergency stop switch 53 is switched to the fixed terminal b side.

On the other hand, the S / P conversion circuit 59 converts the serial input to parallel to control relay 61, latch circuit 67, and transmission normal relay 6
It is a circuit that outputs to 5. Control switch 69, transmission normal switch 71 and emergency stop output switch 73 are control relay 6
1, Responding to the transmission normal relay 65 and the emergency stop output relay 63, respectively. The latch circuit 67 is set by the above-mentioned emergency stop information and can turn off the emergency stop output relay 63 and turn off the emergency stop switch 73. Also,
The latch circuit 67 is reset by the normal transmission inversion information. The normal transmission inversion information is sent to the sender's emergency stop switch 53.
Is switched to the fixed terminal a side, and is transmitted when the fixed terminal b becomes "0".

Next, the operation at the time of emergency stop will be further described with reference to FIG.

When the emergency stop operation is performed, point A in FIG. 3 (b) is the lowest operating voltage of the P / S conversion circuit 57, so the serial data in FIG. 3 (c) is transmitted to part of the data D7. . At this time, since the emergency stop information has already been input to the P / S conversion circuit 57, the emergency stop information is transmitted at the position of the data D4. If the information on the data D4 is correct on the receiving side, the S / P conversion circuit 59 outputs the emergency stop information.
67 is set. As a result, as shown in FIG.
Prior to the point, the emergency stop output relay 63 is turned off and the control output from the output terminal 75 is cut off. If there is an error in the transmission information, the transmission normal relay 65 as shown in FIG.
Is turned off, the control output can be cut off even if the transmission normal switch 71 is turned off and the emergency stop information is not transmitted.

The above judgment is made as shown in FIG.
This can be done by taking the logical product of (e).

When the control is performed again, it can be controlled by resetting the latch circuit 67 with a normal transmission signal.

According to such an emergency stop system, the emergency stop information can be transmitted to the receiving side at point B in FIG. 3 (b), and the control output can be cut off promptly.

Further, even if the emergency stop information is not transmitted due to some failure, the power supply on the transmission side is turned off, so that the control output can be cut off at point B1 and safety can be ensured.

The emergency stop switch 53 shown in FIG. 1 may be a system such as a power switch 81a and an information input switch 81b which are linked by one emergency stop switch as shown in FIG. In this case, when the emergency stop switch is turned on, the power switch 81a is turned off and the information input switch 81b is turned on.

EFFECTS OF THE INVENTION According to the present invention, emergency stop information can be quickly transmitted to a controlled object, and even if emergency stop information cannot be transmitted due to a failure or an abnormality in a transmission line, an emergency stop can be reliably performed. it can.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing another embodiment of the emergency stop switch of FIG. 1, FIG. 3 is a diagram showing operation signals of the present invention, and FIG. FIG. 6 is a diagram showing a conventional emergency stop system. 11,57 ... P / S conversion circuit, 13,51 ... Operation switch, 15,55 ... Power supply circuit, 15a, 55a ... Stabilized power supply, 15b, 55b ... Power supply, 15c55c
… Capacitor, 15d, 53… Emergency stop switch, 23, 59… S / P
Conversion circuit, 25,61 ... Control relay, 26,65 ... Transmission normal relay, 27,69 ... Control switch, 29,75 ... Control output terminal, 31,7
1 ... Transmission normal switch, 32,76 ... Common terminal, 63 ... Emergency stop output relay, 67 ... Latch circuit, 73 ... Emergency stop output switch, 81a, 81b ... Interlocking switch.

Claims (1)

[Claims] 1. An information transmission means for transmitting switch information on a transmission side, and a power supply circuit for supplying an operating power supply voltage to the information transmission means and gradually decreasing the power supply voltage by operating an emergency stop switch. On the receiving side, the information from the information transmission means is received and error checking is performed, and if there is no error, a control output to the controlled device is obtained, and if there is an error, all the control outputs are output. In an emergency stop system comprising disconnection information receiving means, means for inputting emergency stop information to the information transmitting means in conjunction with an emergency stop operation of the emergency stop switch, and the information receiving means An emergency stop system comprising means for forcibly disconnecting all the control outputs when the emergency stop information is detected even if there is no error.