JPH07306735A - Power source control system - Google Patents

Abstract

PURPOSE:To report a host device of the contents of power source abnormality and a power-source abnormality generating device if the power source abnormality occurs. CONSTITUTION:This system consists of a power source part 4, a power source control interface circuit 6, an abnormality detecting circuit 9, an abnormal state coding circuit 10, an address sending circuit 11, an abnormality signal line 26, an alarm display line 23, an error code line 24, an address line 25, and a power source control interface 16; when the power source 4 becomes abnormal, the alarm signal line 23 turns ON and the abnormality contents and an abnormal device address are sent out to the error code line 24 and address line 25 respectively. Consequently, if the power source abnormality occurs, the host device can know the contents of the power source abnormality and the device where the power source abnormality occurs immediately, so the maintainability of an information processing system can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control system for an information processing system, and more particularly to a power supply control system suitable when a power supply failure occurs in an information processing apparatus.

[0002]

2. Description of the Related Art FIG. 2 shows a connection example of a power supply control interface (PCI) 16 in an information processing system.
(A) The figure shows the upper device (CPU or system coresole)
Reference numeral 30 shows a configuration in which a plurality of input / output control devices (IOCs) 31 are connected by a power supply control interface 16,
(B) The figure shows a configuration in which only one unit is connected.

The input / output control device 31 is controlled by the power supply control interface 16 to turn on / off the power supply according to an instruction from the host device 30. Further, when the power supply abnormality of each input / output control device 31 occurs, the power supply control interface 16
Although an alarm display line inside the above reports a power supply abnormality to the host device 30, no consideration has been given to the detailed contents of the power supply abnormality and the report regarding the device in which the power supply abnormality has occurred.

A device related to this type of device is, for example, JP-A-55-628.

[0005]

In the conventional PCI, a power failure that has occurred in the IOC is reported to the host device by an alarm display line. The content of the power failure reported at this time only indicates that the power failure has occurred, and no detailed content of the power failure is reported. Therefore, the host device side does not know the content of the power failure,
I was not able to respond quickly to a power failure.

[0006] In addition, PCI can be connected between each IOC. Therefore, when the power supply failure occurs in any of the devices in the connected configuration, it is not possible to specify which device has the power supply failure.

It is an object of the present invention to provide a device capable of indicating in which device the contents of the power failure have occurred when the power failure occurs.

[0008]

In order to achieve the object of the present invention, an PCI is provided with an error code line indicating the contents of a power failure and an address line for indicating a device in which the power failure has occurred. .

[0009]

When the power failure of the IOC occurs, the power failure can be reported to the host device by the PCI alarm display line, the details of the power failure can be reported by the error code line, and the device address can be reported by the address line. Therefore, when a power failure occurs, it is possible to know what kind of power failure has occurred in which device.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows a power supply control circuit configuration in a magnetic tape control device according to the present invention.

The magnetic tape controller 1 comprises a control logic unit 3, a power supply unit 4, a power supply control interface circuit 6 and a control voltage circuit 5. The control logic unit 3 is connected to the channel and the magnetic tape device 2 by the channel interface 12 and the MTU interface 13, and performs write 1 read control operation of the magnetic tape device 2 according to an instruction from the channel. The power supply unit 4 supplies the required DC voltage 14 to the control logic unit 3 from the input power supply line 15. The control voltage circuit 5 supplies a necessary control voltage 17 to the power supply control interface circuit 6 from the power supply line input 15. The power control interface circuit 6 is a power control interface 16 connected to the host device.
The power-on / off control of the power supply unit 4 is performed in accordance with the instruction.
The power control interface circuit 6 is a power on / off circuit 7,
The status report circuit 8, the abnormality detection circuit 9, the abnormal state coding circuit 10, and the address transmission circuit 11 are included. The power-on / off circuit 7 is connected by a power-on selection line 21, a power-on completion line 28, an abnormal power-off line 27 of the power supply control interface 16 and a power-on instruction line 18 for the power source unit 4 to turn on / off the power source unit 4. Take control. The status reporting circuit 8 is connected to the power-on display line 29 and the local display line 22 of the power supply control interface 16 and the local instruction line 19 of the power supply unit 4 to indicate the power-on status and the local display status. The abnormality detection circuit 9 uses the alarm display line 23 of the power supply control interface 16.
It is connected to the DC voltage line 20 of the power supply unit 4, monitors the DC voltage value in the power-on state, and reports the power supply abnormal state. The abnormal state coding circuit 10 outputs an abnormal state as a code to the error code line 24 according to the abnormal signal line 26 which is the output of the abnormality detection circuit 9.

The address sending circuit 25 outputs the address of the device having the power failure to the address line 25 at the time of the failure.
The power control interface 16 can be connected without any problems,
One is connected to a higher-level device (for example, CPU) and the other is connected to a lower-level device (for example, another IOC).

The operation of the present invention will be described below.

The power supply section 4 has a built-in remote / local changeover switch. When this switch is in the remote state, power is turned on / off under the control of the power supply control interface 16, and when the switch is in the local state, it is built in the power supply section 4. Indicates that the power on / off switch is used. In the following description, it is assumed that the remote / local switch is set to the remote state. In this case, power on / off control is performed by the power control interface 16, and the local instruction line 19 is turned off (because it is in the remote state). When the power-on selection line 21 of the power control interface 16 is turned on by an instruction from the host device, the power-on / off circuit 7 turns on the power-on line 18 to instruct the power source unit 4 to power on, and at the same time, the power is turned on. Upon completion, the power-on completion line 28 is turned on to indicate that power-on has been completed for the host device.

The status reporting circuit 8 turns off the local display line 22 and the turn-on display line 29 because the local instruction line 19 from the power supply unit 4 is off. Thereby, the host device recognizes that the power is turned on in the remote state. If any abnormal state occurs in the power supply unit 4 while the power of the device is turned on, the voltage value of one of the voltage lines of the DC voltage line 20 (for example, + 5V, -5V, + 12V, etc.) is lower than that in the normal state. Alternatively, when the voltage becomes high, the abnormality detection circuit 9 detects a voltage abnormality and turns on the alarm display line 23. When the abnormal signal line 26 is output according to the abnormal state, the abnormal state coding circuit 10 outputs a code corresponding to the abnormal state to the error code line 24. The address sending circuit 11 outputs the device address to the address line 25. The error code line 24 and the address line 25 are signals that become valid when the alarm display line 23 is on. As a result, when the alarm display line 23 is turned on in the higher-level device, the error code and the address of the device in which the error occurred are the numerator due to the error code line 24 and address line 25. Therefore, the host device informs the operator of what kind of abnormality has occurred in which device by means of an appropriate means (for example, a Cholesol screen display) by the host device, so that it is possible to quickly respond to the abnormal state. In the conventional power supply control interface, when the devices are connected to each other, it is not possible to know which device has become abnormal or what kind of abnormality even if an abnormal state occurs.

[0016]

According to the present invention, in a configuration in which a number of devices are variably connected to the power control interface and the power is turned on / off, any one of the devices is wise connected. Even if some kind of power supply error occurs, it is possible to know what kind of power supply error has occurred in the device of which address, which enables quick response and improves the maintainability of the information processing system. There is.

[Brief description of drawings]

FIG. 1 shows an example of a power supply control configuration according to an embodiment of the present invention.

FIG. 2 shows an example of power supply control interface connection.

[Explanation of symbols]

 6 ... Power supply control interface circuit, 10 ... Abnormal condition coding circuit, 11 ... Address sending circuit, 26 ... Abnormal signal line, 24 ... Error code line, 25 ... Address line, 16 ... Power supply control interface.

Claims (1)

[Claims] 1. An information processing system comprising an input / output device capable of inputting / outputting information to / from a host device and an input / output control device for controlling the operation of the input / output device based on a command from the host device. A power supply control method comprising means for detecting a power supply abnormality when a power supply abnormality occurs in the entry output control device and reporting the contents of the power supply abnormality and the device in which the power supply abnormality has occurred to a higher-level device.