JPS63128410A - Power supply control system for work station - Google Patents

Abstract

PURPOSE:To eliminate danger without affecting the working of a work station by using a means which holds an application state of a power supply of the work station regardless of the state of a power supply switch based on an indication given from a keyboard connected to the work station to inhibit break of the power supply. CONSTITUTION:When a power supply switch 5 is applied and the contact of the switch 5 is closed, a relay 4 works to close its contact. Thus the electric power is supplied to a power supply unit 7 from a power supply input line 3 and the electric power needed for a work station 1 is outputted to an output line 8 in a power supply application state. Under such conditions, an indication is given from a keyboard 2 to inhibit of the power supply and a power supply break inhibition flag register 9 is set. Thus the relay contact 6 is kept closed via a relay driver 10. In this holding state the relay 4 never works although the switch 5 is opened by a misoperation and the contact 6 is still kept closed together with the power supply kept under its application state.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a power supply control method for a workstation.
In particular, the present invention relates to a power control method for workstations that prevents the power from being cut off due to incorrect operation of the power switch.

(Prior Art) Conventionally, power to a workstation has been forcibly turned on or off by operating a power switch of the workstation, which is related to the status of the workstation.

(Problems to be Solved by the Invention) With the conventional power supply control method described above, if the power switch of the workstation is accidentally turned off by mistake, there is a risk that the operation of the workstation will be disrupted. . For example, if the workstation is powered off due to an erroneous operation while the workstation is running a program, there is a problem in that all program execution up to that point becomes invalid.

The present invention has been made to solve these problems, and an object of the present invention is to provide a power control system for a workstation that can maintain a power-on state even if the power switch is erroneously operated.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a power control system in which the power is turned on or off by the power switch of the workstation. The configuration includes means for maintaining the power source in an on state regardless of the power switch based on an instruction from Shima et al. to prohibit power disconnection.

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

FIG. 1 is a block diagram showing a power supply control system for a workstation according to this embodiment.

In the drawing, 1 is the workstation, 2 is the workstation board, 3 is the power input line of the workstation 1, 4 is the relay, 5 is the power switch, 6 is the contact of relay 4, 7 is the power supply unit, B is the output line of the power supply unit. Further, in the figure, reference numeral 9 denotes a power cut-off prohibition flag register, and lO denotes a relay driver that controls the relay contact 6 based on a signal from the power cut-off prohibition flag register 9.

Relay 4 is operated by power switch 5 to turn on and off its contacts 6. On the other hand, the relay contact 6 is connected to the power switch 5
The closed state is maintained by a signal from the relay driver 10 regardless of the situation.

Next, the operation will be explained.

When the power switch 5 is turned on and the contacts of the power switch S are closed, the relay 4 is activated and its contacts 6 are closed. Then, power is supplied from the power supply input line 3 to the power supply unit 5, and the power necessary for the workstation 1 is outputted to the output line 8. This state is the power-on state. In this state -
When an instruction to prohibit power disconnection is input from the board 2, the power disconnection prohibition flag register 9 is set, and the relay contact 6 is maintained in the closed state via the relay driver 10. In this holding state, even if the power switch S is opened by mistake, the relay 4 will not operate, the closed state of the contact 6 will be maintained, and the power will remain on.

To turn off the power to the workstation 1, a reset signal instructing power cut-off prohibition is inputted from the main board 2, and the power cut-off prohibition 7 lag register 9 is reset. Then,
Since the relay driver 0 releases the closed state of the relay contact 6, if the power switch S is opened in this state, the relay 4 is restored, the contact 6 is opened, and the power to the workstation I is cut off.

(Effects of the Invention) As explained above, the present invention provides a means for keeping the power of the workstation in the on state regardless of the power switch based on the instruction to prohibit power disconnection from the t'+- board connected to the workstation. As a result, even if the power switch is erroneously operated, the power is kept turned on, thereby eliminating the risk of interfering with the operation of the workstation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a power supply control system for a workstation according to an embodiment of the present invention. 1@...Workstation 2...M-Board 3@...Power input line 4...Relay S...Power switch 6...Relay contact 711...Power supply unit 8...Output line 9 ...Power cut-off prohibition flag register 10...Relay driver.

Claims (1)

[Claims] In a power control system in which power is turned on or off by a power switch of a workstation, means is provided for maintaining the power supply in an on state regardless of the power switch based on an instruction to prohibit power off from a keyboard connected to the workstation. A workstation power control system characterized by: