JPS59223860A - Fault diagnosis method of data processor - Google Patents

Abstract

PURPOSE:To eliminate the need for use of a special device by using an interruption controller and a timer to perform the fault diagnosis. CONSTITUTION:The prescribed initial values are set to timers 2 and 3 of a processor which counts the clock signals with reception of interruption. Then the contents of a counter are read with the next interruption. It is checked whether the counter contents are within a prescribed range of value. Then it is judged that a data processor has a fault when the counter contents are out of the prescribed range.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of diagnosing a failure of a data processing apparatus, and more particularly to a method of diagnosing a failure of a data processing apparatus in which an interrupt is applied at a predetermined period.

It has become essential for data processing devices with complex functions to have a self-diagnosis function to detect failures. Conventional fault diagnosis methods use the microprocessor board, which forms part of a data processing device, to diagnose other parts of the device on the assumption that the board itself is normal. Ta.

However, the fault of the microprocessor board itself was that it could not be diagnosed. This invention was made in view of the above-mentioned conventional problems, and it monitors periodic interrupts to the processor that are generated by a timer. It is an object of the present invention to provide a fault diagnosis method that allows the entire device to perform self-diagnosis.

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram of a microprocessor board implementing the method of the invention. As shown in the figure, each microprocessor 1 has a timer 2.3 and an interrupt controller 4 connected to a bus 1.
connected via a.

FIG. 2 is a flowchart of a main program showing the operation of the microprocessor 1 shown in FIG. Processing P1
In step P2, interrupt counter N built in microprocessor 1 is set to O, and in process P2, timer 2 is set to a predetermined value Y2.
I is set, and the prohibition of interrupts is canceled in process P3. Accordingly, the microprocessor 1 accepts the interrupt and counts the number of interrupts N. In process P4, it is determined whether N is larger than a predetermined number M by the next interrupt, and 82
If it is M, proceed to process 5. In process 5, interrupts are prohibited, processing is performed without failure, and a series of failure diagnosis processes is completed. On the other hand, if 82M is not satisfied, that is, if the number of interrupts N does not reach the predetermined number M, the process proceeds to step 6 and reads the timer 30 count value Y2. In process P7, the count value Y2 is compared with a predetermined judgment value A, and when A≦Y2, the process returns to process P4.

When A≦Y2, that is, when the number of interrupts does not exceed M times within the time period for timer 2 to count up to the judgment value A, it is assumed that there is an abnormality in the device;
According to process P8, a failure is displayed.

FIG. 3 is a flowchart of interrupt processing. Processing PIO
Then, it is determined whether the interrupt counter is NIJ''-0 or not. If N=00, the process advances to process 11 and the interrupt counter is incremented by 1. In process P12, timer 3 is set to Y3I. , ends the current interrupt process.Meanwhile, in process 10, N'
When it is determined that it is tO, the process advances to step 13 and reads the timer 30 count value Y3. In process 14, X≧Y3≧
2, if yes, proceed to process 11, if no, proceed to process 15, and the malfunction indication is that Y3 is X and Y
This indicates that the count value Y3 does not exist within the range defined by , and that there is an abnormality in the device.

In the fourth session, b. under the program configured as above.
A timing chart showing the changing states of timers 2 and 3 and the interrupt counter when an interrupt request signal with a fixed period T as shown in FIG.
The horizontal axis shows time t, and the vertical axis shows the husband's count value.

However, it is assumed that this is done at the rising edge of the signal output from the interrupt controller 4 indicated by the interrupt Hb.

As shown in FIG. 4C, when processing P2 (setting of timer 2) of the main program is executed at time to, timer 2
The count value Y2 decreases with a constant slope as the count progresses, that is, with time. At time t1i, the setting of the timer 3 based on the interrupt has not been executed, so the count value Y3 of the timer 3 is indeterminate, as shown by the broken line in FIG. 4a. Interrupt controller 4 at time t1
Since the signal rises, an interrupt is generated, and the timer 30 count value Y3 is set to a certain value Y3, as shown in a. By counting the clock signal, it decreases with a constant slope over time. d indicates N of the interrupt counter.

After that, when another interrupt is applied at time t2,
In response, the microprocessor 1 reads the current count value Y3 of the timer 30 and compares it with predetermined set values X and z. If X≦Y3≦2 holds for the count value Y3, it is assumed that the device is functioning normally, and the value 73I is set in the timer 3 again, and the operation described above is repeated. Therefore, the contents of timer 3 change as shown by a. However, as shown in b, even though periodic interrupts are performed, the interrupts are executed irregularly, and the timer 30 count value Y3 becomes Y3<X or y a (Z In other words, if it is outside the range of X≦Y3≦2 as shown in FIG. Display.

As described above, according to the present invention, since fault diagnosis is performed using an interrupt controller and a timer, sufficient fault self-diagnosis results can be obtained without the need for special equipment. effective.

[Brief explanation of drawings]

Figure 1 is a configuration diagram showing the configuration of a microprocessor board;
Figure 2 is a flowchart of the main program), Figure 3 is a flowchart of the interrupt processing program, Figure 4 is a timing chart showing the status of each part when there is no failure in the device,
FIG. 5 is a timing chart showing the state of each part when there is a failure in the device. 1... Microprocessor, 2, 3... Timer, 4
...Interrupt controller. Agent: Masuo Oiwa fiS Draft drawing procedure amendment (spontaneous) 11. (D5S1.10 layer 1-1 Mr. Commissioner of the Japan Patent Office), Indication of case: Japanese Patent Application No. 58-99774 2, Name of Invention Data Processing Device failure diagnosis method 3, Representative Hitoshi Katayama of the person making the amendment, Department 4, Agent 5, Detailed explanation of the invention in the specification to be amended 6, Contents of the amendment (1) Page 3 of the specification In the 9th line, "If N5M, proceed to process 5. Process 5 is a discount" is corrected to "If N5M, proceed to process P5. Process P5 is a discount." (2) Specification No. 3 Negative 13th line ``Proceed to process 6'' is corrected to ``Rij processing pressure 6''. 131 Specification, page 4, 3rd line ``If N=0, proceed to process 11.''
``Proceed to process P11 when &rN=0'' is corrected. that's all

Claims (1)

[Claims] In a fault diagnosis method for a data processing device having a processor configured to accept interrupts input at a predetermined period, a predetermined initial value is set in a timer of the processor that counts cyclic signals upon acceptance of an interrupt, and the next interrupt is The content of the above counter is read, and it is checked whether the above content is within a predetermined range, and if it is outside the predetermined range, it is determined that there is a failure in the data processing device. A method of diagnosing a failure of a data processing device based on the characteristics of the data processing device.