JPH0443796A - Emergency stop system - Google Patents

Abstract

PURPOSE:To stop a controlled system quickly on emergency by providing a means which detects emergency stop information when emergency stop information is inputted to an information transmission means and no error exists in the information reception means and interrupts a control output forcibly entirely to the system. CONSTITUTION:When an operation switch 51 is operated, its output is inputted to a P/S conversion circuit 57 as combination information of switches. Normally since an emergency stop switch 53 is turned to the position of a fixed terminal (a), a DC power supply 55b is connected to a stabilized power supply 55a and the power supply circuit 55 applies an operating voltage to the P/S conversion circuit 57. However, when the emergency stop switch 53 is operated on emergency and the position of a fixed terminal (b) is selected, an output from the fixed terminal (b) is inputted to the P/S conversion circuit 57 as emergency stop information. Thus, the emergency stop information is quickly sent to the controlled system and sure emergency stop is implemented.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to an emergency stop method for various control equipment.

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

The operation switch 13 can create information by combining a plurality of switches and provide it 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 it as serial data.

The S/P conversion circuit 23 is a circuit that outputs serial input in parallel. Control switch 27. Transmission normal switch 3
1 is a control relay 25. They each respond to the transmission normal status 26. The control relay 25 is relay-controlled and operates the controlled device connected to the output terminal 29 if there is no error in the inspection using the redundant bit based on the information corresponding to the operation switch 13.

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

Now, the emergency stop switch 15d of the power supply circuit 15 is activated.
When an emergency stop operation is performed at timing t1 in FIG. 3(a), discharge of the capacitor 15c is started, and a voltage having a waveform as shown in FIG. 3(b) is applied to the P/S conversion circuit 11 as the power supply voltage. If the lowest operating voltage of the P/S conversion circuit 11 is at point A in FIG. 3(b), the serial data in FIG. 3(C) is transmitted up to point A, that is, the data is transmitted up to the point of data D7. , it will stop after that.

On the other hand, on the receiving side, when information is interrupted or a data transmission error is detected, the transmission normal relay 26 turns off the transmission normal switch 31, and the control switch 27
Regardless of the state of 8, the information "0" can be obtained at the 8-input terminal 29.Therefore, as before, the information may be interrupted at point A, or an error in the transmission of data D7 may be detected. Then, as shown in FIG. 3(e), the transmission normal relay 26 is turned off and the control output is cut off.

(Problems to be Solved by the Invention) The conventional emergency stop method as described above is dangerous because it takes time from when the emergency stop operation is performed until the controlled object actually stops.

SUMMARY OF THE INVENTION An object of the present invention is to provide an emergency stop method that can quickly stop 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 Problems) An information transmitting means on the transmitting side for transmitting switch information, an operating power supply voltage being supplied to the information transmitting means, and operation of an emergency stop switch causing the above-mentioned A power supply circuit that gradually lowers the power supply voltage, and a receiving side that receives information from the information transmission means, performs an error check, and if there is no error, obtains a control output to the controlled equipment, and confirms that there is no error. In the emergency stop system, the emergency stop system is equipped with an information receiving means that cuts off all the control outputs when the emergency stop switch is operated to manually transmit emergency stop information to the information transmitting means. and means for forcibly cutting off all of the control outputs when the emergency stop information is detected even if the information receiving means does not make the error.

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

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

A plurality of operation switches 51 are connected in parallel to the input terminal of the P/S conversion circuit 57, and a power supply circuit 55 is connected to the power supply terminal.
output terminal is connected. The DC power supply 55b constituting the power supply circuit 55 has a negative terminal grounded and a positive terminal connected to the movable terminal C of the emergency stop switch 53. One fixed terminal of the emergency stop switch 53 is the P/S conversion circuit 5
7 information input terminals. Further, the other fixed terminal a of the emergency stop switch 53 is connected to the stabilized power supply 55.
It is connected to the input terminal of a. Further, the other terminal of a capacitor 55c, one end 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 a plurality of control relays 61.
A specific first output terminal is connected to a set terminal of the latch circuit 67. A specific second output terminal of the S/P conversion circuit 59 is connected to a transmission normal relay 65 and also connected to a reset terminal of a latch circuit 67 via an 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 a control output terminal 75, and the other is connected to a common terminal 76 (power terminal) through a transmission normal switch 71 and an emergency stop output switch 73 in series.
It is connected to the.

Next, the operation will be explained.

When the operation switch 51 is operated, its output is input to the P/S conversion circuit 57 as switch combination information. Normally, the emergency stop switch 53 selects the fixed terminal a, so the DC power source 55b is connected to the stabilized power source 55a. Therefore, the power supply circuit 55 can supply an operating voltage to the P/S conversion circuit 57. However, in an emergency, if the emergency stop switch 53 is operated and the fixed terminal is selected, the output from the fixed terminal can be input to the P/S conversion circuit 57 as emergency stop information. In this way, even if the emergency stop switch 53 is switched, the P/S conversion circuit 57 operates normally for a while because the capacitor 55c exists.

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

On the other hand, the S/P conversion circuit 59 converts the serial input into parallel and controls the control relay 61. This is a circuit that outputs to the latch circuit 67 and the transmission normal relay 65.

Control switch 69. Transmission normal switch 71 and emergency stop output switch 73 are responsive to control relay 61° transmission normal relay 65 and 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. Furthermore, the latch circuit 67 is reset by the transmission normal reversal information.

The transmission normal reversal information is transmitted when the emergency stop switch 53 on the transmitting side is switched to the fixed terminal a side and the fixed terminal becomes "0".

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

When the emergency stop operation is performed, since point A in FIG. 3(b) is the lowest operating voltage of the P/S converter circuit 57, the serial data in FIG. 36(c) is transmitted up to part of the data D7.

At this time, the emergency stop information has already been input to the P/S conversion circuit 57, so the emergency stop information is transmitted at the position of data D4. On the receiving side, if there is no error in the information in the data D4, the S/P conversion circuit 59 outputs emergency stop information, so the latch circuit 67 is set. the result,
As shown in FIG. 3(d), the emergency stop output relay 63 is turned off prior to point A, and the control output from the output terminal 75 is cut off. Also, if there is an error in the transmitted information, see Figure 3 (e
), when the normal transmission relay 65 is turned off, the normal transmission switch 71 is turned off, and the control output can be cut off even if the emergency stop information is not transmitted.

The above judgment is as shown in Figure 3(f), (d) and (e).
) can be done by taking the conjunction of

When re-controlling, the latch circuit 67 is reset with a transmission normal signal to enable control.

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 quickly shut off.

In addition, even if emergency stop information is not transmitted due to some kind of failure, B1
The control output can be shut off at any point, ensuring safety.

Note that the emergency stop switch 53 in FIG. 1 is a power switch 81 that is linked with one emergency stop switch as shown in FIG.
A and an information input switch 81b may also be used. 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 promptly transmitted to a controlled object, and even if the emergency stop information cannot be transmitted due to a failure or an abnormality in the transmission path, an emergency stop can be performed reliably. can.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing another embodiment of the emergency stop switch shown in FIG. 1, FIG. 3 is a diagram showing operating signals of the present invention, and FIG. is a diagram showing a conventional emergency stop method. 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, 2
5.61... Control relay 26.65... Transmission normal relay 27.69... Control switch, 29°75.
...Control output terminal, 31.71...Transmission normal switch, 32.76...Common terminal, 63...Emergency stop output relay 67...Latch circuit, 73...Emergency stop output switch, 81a , 81b... Interlocking switch. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Liang 2

Claims (1)

[Scope of Claims] Information transmission means on the transmitting side that transmits switch information; and a power source that supplies operating power supply voltage to the information transmission means and gradually lowers the power supply voltage by operating an emergency stop switch. The circuit and the receiving side receive the information from the information transmission means, perform an error check, and if there is no error, obtain a control output to the controlled device, and if there is an error, output the control output. In the emergency stop method, the information receiving means includes: means for inputting emergency stop information into the information transmitting means in conjunction with the emergency stop operation of the emergency stop switch; and the information receiving means. An emergency stop system characterized by comprising: means for forcibly cutting off all of the control outputs when the emergency stop information is detected even when the above-mentioned error does not occur.