JPS59180637A - Computer for control - Google Patents

Abstract

PURPOSE:To attain self-diagnosis without stopping the system operation and to detect abnormality quickly by adding a self-diagnosis circuit and executing self- diagnosis by using the idle time of processing time. CONSTITUTION:When real time control is to be executed by a controlling computer, input processing is executed in a processing period of several ten milliseconds through several hundred milliseconds and idle time exists in the processing period. A central processing part 2 outputs a self-diagnosis starting signal 6 to the self-diagnosis circuit 4 by using the idle time, so that the circuit 4 is actuated to diagnose a storage part 1, the circuit 2 and an I/O control part 3, and if abnormality is generated, the circuit 4 outputs an abnormal signal 8. Thus, the self-diagnosis can be attained without stopping system operation by adding the self-diagnosis circuit and executing self-diagnosis by using the idle time of the processing period, so that abnormality can be detected quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control computer equipped with a self-diagnosis circuit.

Conventionally, this Yuzu control computer was used for diagnosis.
Diagnosis is performed by inputting a diagnostic program each time 5. Diagnosis is performed by manual button operation Diagnosis 1. Diagnosis is performed by starting a program and diagnosis is performed by starting a diagnostic program when the power is turned on. .

With this type of method, diagnosing requires entering the diagnostic program, manually operating buttons, and turning the power on and off, so system operation must be paused each time a diagnosis is executed. There was a drawback that it had to be done.

The present invention eliminates the above-mentioned drawbacks and provides a control computer that is capable of self-diagnosis without stopping system operation by performing self-diagnosis using idle time during processing. be.

The present invention adds a self-diagnosis circuit to a control computer that performs real-time control, and uses free processing time to perform self-diagnosis of the computer.
This is a control computer that can perform self-diagnosis without stopping system operation.

Next, one embodiment of the present invention will be described with reference to the drawings.

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

In this block diagram, l is a storage unit that stores programs and data, 2 is a central processing unit that controls all calculations, 3 is an input/output control unit that inputs and outputs data to and from an external device 5, and 4 is a storage unit that stores programs and data. , a self-diagnosis circuit that performs self-diagnosis of the storage unit 1, the central processing unit 2, and the input/output control unit 3, 6 is a self-diagnosis start signal, 7 is a diagnostic signal, and 8 is a self-diagnosis result that is abnormal. 9 is the input/output data, 10 is the memory bus, and 11 is the I10 bus. Further, FIG. 2 is a diagram showing a processing cycle of a general control conbeater.

Control computers that perform real-time control generally have a processing cycle of several tens of milliseconds to several hundred milliseconds.
(Fig. 2 1゛), in which input processing, arithmetic processing,
Output processing, interrupt processing, etc. are performed, but there is usually some idle time during these processes.

(See Figure 2) Utilizing this free time, the central processing unit 2 outputs the self-diagnosis start signal 6 to the self-diagnosis circuit 4, the self-diagnosis circuit 4 operates, and the memory unit 11, the central processing section 2 and the input/output control section 3 are diagnosed, and if an abnormality occurs, an abnormality signal 8 is generated. In addition, if the system is a multi-system, it is possible to automatically switch to another system by this abnormal signal.

According to the present invention, 1. By adding a self-diagnosis circuit to the control computer and performing self-diagnosis using idle time in the processing cycle, there is an effect that self-diagnosis can be performed without stopping the operation of the system. Furthermore, since self-diagnosis is repeated at very short intervals of several tens to hundreds of milliseconds, it is effective in detecting abnormalities early.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing the processing cycle of a general control computer-i. 1...Storage unit, 2...Central processing unit, 3
...Input/output control unit, 4...Self-diagnosis circuit, 5...External equipment, 6...Self-diagnosis start signal, 7...・Diagnostic signal, 8... Abnormal signal, 9... Input/output data, 10...
・Memory bus, 11...l/υ bus.

Claims (1)

[Claims] A control computer that performs real-time control, has a self-diagnosis circuit added to the control computer, and performs self-diagnosis of the computer using idle time during processing.