JPH11353059A - Method and device for processing for turning off power source of numerical controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the normal end of a system software from being disabled by turning off a power source before communication end processing even in the case of requiring long time for the end processing of communication with external equipment when power source turning-off processing is performed. SOLUTION: This device is provided with a system software 2 connected with external equipment 4 through a communication line 5 so as to input a power source off signal 10 from a power source turning-off means 3, system software abnormality detecting circuit 12 for detecting the abnormality of this system software 2, power source off control switching circuit 15 for ANDing the input signal 10 from the power source turning-off means 3 and an output signal from the system software abnormality detecting means 12 and ORing this ANDed result and a power source off control signal from the system software 2, and power source off circuit 8 for turning off the power source according to a power source off signal 17 from this power source off control switching circuit 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for turning off a power supply of a numerical control device of a machine tool or a robot having a communication means with an external device.

[0002]

2. Description of the Related Art Conventionally, in a numerical control device for controlling a machine tool or a robot, as shown in FIG.
The power-off processing is performed by hardware by inputting the power-off signal 10 to the power-off circuit 8 from the power supply. FIG.
, 1 is a numerical controller, 2 is system software, 3
Is a power cutoff means such as a switch, 4 is an external device, 5 is a communication line, 6 is a power supply device, 7 is a power supply, 8 is a power cutoff circuit, 9 is an internal power supply of the numerical control device, and 10 is a power cutoff device. Input signal line. In FIG. 2, in the conventional power-off processing method, when there is a signal input from the power-off means 3, the power-off circuit 8 operates and the power supply 7 from the power supply 6
, The internal power supply 9 of the numerical controller is shut off, and communication termination processing is performed.

[0003]

However, in the prior art, when the power-off process is performed, if the communication end process with the external device 4 takes a long time, the power supply of the numerical controller 1 is shut off before the communication end process. There was a problem that it could not be completed normally. Therefore, the present invention solves such a problem and provides a means for enabling normal communication termination processing of system software.

[0004]

In order to solve the above-mentioned problems, the present invention relates to a method for processing a power supply cutoff of a numerical controller having a communication function with an external device. It is characterized in that after detecting by system software and normally terminating the communication with the external device, a power-off process is performed by the system software, and when a system software abnormality occurs, a system software abnormality detection signal and the power supply A power-off processing method for a numerical control device, characterized in that the power-off processing is performed by a logical product with an input signal from a power-off means.
Furthermore, a system software that is connected to the external device via a communication line and inputs a power-off signal from a power-off means, a system software abnormality detection circuit for detecting an abnormality of the system software, A power-off control switching circuit that takes a logical product of an input signal and an output signal from the system software abnormality detection circuit and performs a logical sum of the logical product of the logical product and a power-off control signal from the system software; A power cutoff circuit for a numerical control device, comprising: a power cutoff circuit that cuts off power in response to a power cutoff signal from a switching circuit.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. The description of the same reference numerals in FIG. 1 as those in FIG. 2 is omitted. 1
2 is a system software abnormality detection circuit such as a Watch Dog Timer, 13 is a system software operation confirmation signal, 14 is a power-off control signal from the system software,
Reference numeral 15 denotes a power-off control switching circuit, 16 denotes a system software abnormality detection signal, and 17 denotes a power-off signal. In the figure, the numerical controller 1 is communicating with the external device 4 through the communication circuit 5, the system software operation confirmation signal 13 is normally output, and the system software abnormality detection signal 16 from the system software abnormality detection circuit 12 is output. Otherwise, when the power-off signal 10 is input from the power-off means 3, the system software 2 recognizes the power-off signal 10 and performs communication termination processing with the external device 4. After the communication processing with the external device 4 is completed, the power cutoff signal 17 is output from the system software 2 to the power cutoff circuit 8 and the internal power supply 9 of the numerical controller is cut off. . On the other hand, since the system software abnormality detection signal 16 is not output from the system software abnormality detection circuit 12,
Even if the input signal 10 is input from the power cutoff means 3 to the AND logic circuit of the power cutoff control switching circuit 15, the power cutoff circuit 8
Is not output. When an abnormality occurs in the system software 2, the system software operation confirmation signal 13 is not output, and the system software abnormality detection circuit 12 outputs the system software abnormality detection signal 16. In this state, when the power cutoff signal 10 is input from the power cutoff means 3, a power cutoff signal 17 is output to the power cutoff circuit 8 by the AND logic circuit of the power cutoff control switching circuit 15, and the internal power supply 9 of the numerical controller is turned off. Will be shut off.

[0006]

As described above, according to the present invention, even if a long time is required for the communication termination processing with the external device,
Since the system software performs the power-off processing after the communication processing is completed, it is possible to perform the communication termination processing normally, and it is possible to perform the power-off processing even when the system software abnormality occurs.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional embodiment.

[Description of Signs] 1 Numerical control device 2 System software 3 Power cutoff means 4 External device 5 Communication line 6 Power supply device 7 Supply power supply 8 Power cutoff circuit 9 Numerical control device internal power supply 10 Power cutoff signal 12 System software abnormality detection circuit 13 System software operation confirmation signal 14 Power off control signal from system software 15 Power off control switching circuit 16 System software abnormality detection circuit 17 Power off signal

Claims (3)

[Claims] 1. A method of processing a power cut-off of a numerical control device having a function of communicating with an external device, wherein an input signal from a power cut-off means is detected by system software in the numerical control device, and communication with the external device is normally performed. A power-off processing method for a numerical control device, wherein the power-off processing is performed by the system software after the termination. 2. The numerical control according to claim 1, wherein when the system software abnormality occurs, the power-off processing is performed by a logical product of a system software abnormality detection signal and an input signal from the power-off means. How to turn off the power of the device. 3. A power cut-off processing device of a numerical control device having a communication function with an external device, comprising: system software connected to the external device via a communication line and inputting a power cut-off signal from a power cut-off means; A system software abnormality detection circuit for detecting an abnormality of the system software, and a logical product of an input signal from the power-off means and an output signal from the system software abnormality detection circuit, and a logical product of the logical product and the system software A numerical control device, comprising: a power-off control switching circuit that performs an OR operation with a power-off control signal; and a power-off circuit that is powered off by a power-off signal from the power-off control switching circuit. Power cutoff device.