JPH048807B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power-off control method when a computer processing device executes a power-off interrupt process while a program is being executed.

When a program is interrupted by an interrupt, it is necessary to save the data to a file, etc. to prevent it from being destroyed before restarting execution when the power is turned off, and then cut off the supply voltage. Moreover, a reliable control method is desired.

[Conventional technology]

A conventional example will be explained using figures. FIG. 4 is a block diagram illustrating a conventional example.

The power supply device 1 supplies a DC voltage E to the processing device 2, but when the processing unit 3 of the processing device 2 executes a power-off interrupt while executing the program 4,
After the data D being executed is saved to the file device 5, it is necessary to disconnect the power supply section 6 of the power supply device 1.

Therefore, when the power is cut off, when the contact S of the open/close switch of the operation panel 16 is closed, the potential at point a becomes 0, and this becomes the interrupt signal 1 and is sent to the interrupt control section 7. As a result, the interrupt control unit 7 activates the timer 8 and transmits the occurrence of the interrupt to the processing unit 3. When the program is being executed, the processing unit 3 stops the execution, and
The data D is saved to the file device 5, and then the control unit 6 is notified that "power can be cut off". Along with this, the control unit 6 sends a power-off command B to the power supply device 1. In response to this command, for example, the auxiliary relay of the contact section 9 is energized, and the contact of the relay cuts off the excitation current of the main switch of the power supply section 6, cutting off the input and stopping the supply of the secondary voltage E.

In addition, in this process, the running program 4
If the program runs out of control due to a bug or the like, it will not be possible to stop the program execution or save data to the file device, so the processing unit 3 will send a message to the control unit 6 saying “power off”.
However, the timer 8 sends an output signal C to the control unit 6 with a time delay, and the control unit 6 sends a power-off command B to the power supply unit, making it impossible to turn off the power. The supply of voltage E is stopped at .

[Problem that the invention seeks to solve]

As described above, there is a problem in that if the program being executed goes out of control for some reason during the power-off interrupt processing, the power cannot be turned off unless a timer is used.

[Means for solving problems]

The above problem is that a switch is provided with a circuit that changes the potential applied to the contact part to ground potential by opening and closing the contact, and when the contact is changed from the open state to the closed state by operating the switch, the potential applied to the contact part changes to the ground potential. Due to the fluctuation, a signal is given to the processing unit via the logic circuit and the interrupt control unit, and the processing unit uses the signal to send a power-off command to the control unit to stop the program execution and save the data to the file device. The control section sends a power cutoff signal to the power supply section via the logic circuit to cut off the voltage supply, and even in an abnormal state where a power cutoff command is not issued from the processing section, the contact of the switch remains closed. A power supply cutoff control characterized in that a signal due to the potential fluctuation at the time of restoration from the open state to the open state is inputted to a logic circuit, and the logic circuit sends a power supply cutoff signal to the power supply section to cut off the power supply. Solved by method.

[Effect]

As described above, the present invention provides a state in which when an interrupt process for power-off is performed during program execution, even if the program runs out of control, the contact returns from closed to open after operating the on/off switch without using a timer. This is a power-off control method that uses changes to reliably turn off the power supply.

〔Example〕

Hereinafter, the present invention will be explained with reference to the drawings. 1st
The figure is a block diagram illustrating an embodiment of the present invention.
FIGS. 2 and 3 are time charts for explaining one embodiment of the present invention.

In FIG. 1, a switch 10 on an operation panel 16 is, for example, a non-locking switch, which closes its contacts when pressed by hand and automatically restores to open when released. When the contact is closed by pressing down the switch 10, the potential at point a becomes zero potential, the flip-flop 11 is set, and the signal level at its output terminal A becomes 1. The change in the rise is
The signal becomes an interrupt signal I and is sent to the interrupt control section 7, and is simultaneously applied to the NAND circuit 13.

The interrupt control unit 7 sends this power-off interrupt signal to the processing unit 3, and the processing unit 3 stops the execution of the program 4, saves the data D to the file device 5, and then sends the power-off command to the control unit. Send to. As a result, the control section 6 outputs the power-off signal b, inverts the input level of the NAND circuit 12, and outputs the power-off signal M, which drives the auxiliary relay of the contact section 9 of the power supply device 1 and disconnects the main power switch. However, the supply of voltage E from the power supply section 6 is stopped.

The details of this control operation will be explained with reference to the time chart of FIG.

FIG. 2 is a time chart during normal operation. In FIG. 2, at time t ₁ , a pushes down the switch 10 in FIG. 1 to close the contact, and at time t ₄
When the contact is opened at , the potential between times t ₁ and _{t 4} becomes 0. Also, when the contact of switch 10 closes, the time
At _t2 , flip-flop 11 is set and the level of output terminal A is inverted from 0 to 1. The inputs of the NAND circuit 13 are 1 and 0, and the output is 1, and the inputs of the NAND circuit 12 are 1 and 1, and the output is 0, and the time
No signal is sent to the power supply at t ₂ .

FIG. 2b shows the output terminal A of the flip-flop 11.
The signal waveform of interrupt signal I, that is, the signal waveform of interrupt signal I is shown. When the processing section 3 in FIG. 1 issues a response signal F to the interrupt at time _t3 as shown in c, the flip-flop 11 is reset and the signal level at its output terminal A returns to zero. Therefore, the inputs of the NAND circuit 13 are 0, 0, and the output is 1.
The inputs of the NAND circuit 12 are 1, 1, and the output is held at 0, and no signal is sent to the power supply device 1 at time _t3 .

At time _t5 , when the processing unit 3 finishes executing the program 4 and saving the data D to the file device, the processing unit 3 sends a power-off command G to the control unit 6, which causes the control unit to 6 is Figure 2d
Outputs a power-off signal b shown in FIG. Since this is a negative signal as shown in the figure, the input of the NAND circuit 12 changes to 0 and 1, and the output becomes 1, and the power cut signal M is sent to the power supply device 1 as shown in FIG. As shown in FIG. 2(f), the main switch of the power source is turned off to cut off the supply voltage E of the power source section 6.

The above is the case of normal operation, but the case of abnormal operation due to runaway of the program at the time of an interrupt will be explained with reference to FIGS. 1 and 3.

In FIG. 1, when the switch 10 is pressed down,
The flip-flop 11 is set, and the rise of its output terminal A causes the signal I to be connected to the interrupt control section 7.
Sent to the input terminal of the NAND circuit. As a result, the interrupt control unit 7 notifies the processing unit 3 of the occurrence of a power-off interrupt. However, if the program being executed in the processing section 3 runs out of control, the processing section 3 will not issue the response signal F. Therefore, the control section 3 does not issue the power-off signal b either. To explain this using the dime chart in FIG. 3, when the contact S of the switch 10 in FIG. 1 is closed at time _t1 as shown in FIG. becomes 1 at t ₂ ,
The inputs of the NAND circuit 13 are 1 and 0, and the output is 1,
Therefore, the inputs of the NAND circuit 12 are kept at 1, 1, and the output is kept at 0, and no cutoff signal is issued to the power supply at this point.

However, at time _t4 , when the switch 10 is no longer pressed and the contact S is restored, the input to the NAND circuit 13 becomes 1, 1, and the output is inverted to 0 as shown in Figure 3c. The input of the NAND circuit 12 is 1,
When the output is 0, the output becomes 1, and as shown in FIG. Voltage E is also Fig. 3 e
It is blocked like this.

As described above, if a non-lock switch or the like is used as the switch, the power can be cut off by using the return signal at the time of restoration.

〔Effect of the invention〕

According to the present invention, even if a program runs out of control during power-off interrupt processing, it is possible to quickly and reliably perform power-off interrupt processing using a simple control method without using a timer.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining an embodiment of the present invention, FIGS. 2 and 3 are block diagrams for explaining an embodiment of the present invention, and FIG. 4 is a block diagram for explaining a conventional example. , 1 is a power supply device, 2 is a processing device, 3 is a processing section, 4 is a program, 5 is a file device, 6 is a control section, 7 is an interrupt control section, 8 is a timer, 9 is a contact section, 10 is a switch, 11 is a flip-flop, 12 and 13 are NAND circuits, and 15 is a flip-flop.
AND gate, 16 indicates the operation panel.

Claims (1)

[Scope of Claims] 1. In a power cutoff control method using interrupt processing for supply voltage cutoff, which is executed by a processing unit of a computer while a program is being executed, the potential applied to the contact part changes to the ground potential by opening and closing of the contact. A switch with a circuit is provided,
When the contact is changed from an open state to a closed state by operating the switch, the logic circuit and
A signal is given to the processing section via the interrupt control section, and the processing section stops the execution of the program in response to the signal, saves the data to the file device, and then sends a power-off command to the control section. A power-off signal is sent to the power supply unit via the logic circuit to cut off the voltage supply, and even in an abnormal state where a power-off command is not issued from the processing unit, the contact of the switch is restored from the closed state to the open state. A power cut-off control method, characterized in that a signal based on the potential fluctuation at a point in time is inputted to a logic circuit, and a power cut-off signal is sent from the logic circuit to a power supply section to cut off the power supply.