JPH02259846A - Software monitoring system - Google Patents

Abstract

PURPOSE:To precisely monitor a time to the abnormal operation of a software which originally should be operated with a fixed period by providing first and second monitoring timers which can be simultaneously started and restarted according to an instruction from the software. CONSTITUTION:Monitoring timers 1 and 2 are simultaneously operated according to a timer restart signal 5 from the software timer-out signals 6 and 7 of an output are set to logic '0' only for an operating time Tb of the monitoring timer 1 and an operating time Ta of the monitoring timer 2 to be set in advance. When the next timer restart signal 5 does not come even after more than the time Tb passes, the timer-out signal 6 goes to '1', passes through a logical sum circuit 4 and is outputted as a warning. When the timer-out signal 7 is '0' and the timer restart signal 5 is detected, a timer monitoring circuit 3 sets a warning signal 8 to '1', and outputs the signal as the warning. Thus, the time can be presicely monitored for the abnormal operation of the software which originally should be operated with the fixed period.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a software monitoring technique, and particularly to a method for monitoring abnormal operation of software.

[Conventional technology]

Conventionally, in this monitoring method, a timer that monitors software operation is restarted by a command from software. Usually, a software command is issued at a timing when the relevant timer does not time out, and when the relevant timer times out, the software It was determined that this was an abnormality.

[Problem to be solved by the invention]

In the conventional monitoring method described above, the monitoring timer only needs to be restarted within a certain period of time, and software instructions only need to be issued at intervals within a certain period of time. There is a problem in that if there is any movement, it cannot be detected.

[Means to solve the problem]

In order to solve such problems, the software monitoring system of the present invention includes first and second timers that can be restarted by a command from software, and both timers are started simultaneously by the software command, a first monitoring means for outputting an alert when the software instruction is issued before the first timer times out; and a second monitoring means for outputting an alert when the second timer times out. and monitoring means.

[Effect]

Therefore, according to the present invention, detailed time monitoring can be performed to monitor abnormal operations of software that should operate at regular intervals.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a functional block diagram showing an embodiment of the software monitoring system according to the present invention. In FIG. 1, 1 is a monitoring timer that can be restarted by a command from software, that is, a timer restart signal 5, and 2 is a monitoring timer that can also be restarted by the timer restart signal 5. start simultaneously with the timer restart signal 5. 3 is a timeout signal T from the monitoring timer 2 and a timer restart signal 5
This monitoring circuit 3 is configured to output an alarm when a timer restart signal 5 is sent from software before the timer 2 times out. 4 is the monitoring timer 1
The timeout signal 6 from the timer monitoring circuit 3 and the alarm signal 8 from the timer monitoring circuit 3 are input to the logical sum circuit, and the logical sum output is taken out as an alarm output signal.

Here, when the timer restart signal 5 outputted by a software instruction is input to the supervisory timers 1 and 2, these supervisory timers 1 and 2 operate simultaneously according to the timer restart signal 5.

At this time, as shown in FIG. 2, both timers 1 and 2 output timeout signals 6 and T for preset times, that is, the operating time Tb of the monitoring timer 1 and the operating time Ta of the monitoring timer 2. Let be logic "l".

If the next timer restart signal 5 (Fig. 2 (a)) does not come even after this Tb time has elapsed, the timeout signal 6 becomes "1" (Fig. 2 (C)), and the logic The sum circuit 4 is output as a repetition alarm.

Furthermore, if the next timer restart signal 5 comes before the timeout of the supervisory timer 1, and if the next timer restart signal 5 arrives within the time tυTb, the supervisory timer 1 is restarted. Timeout signal 6 is T again
It remains "0" during time b.

Therefore, the interval T of the timer restart signal 5.

If Tb<To, the timeout signal 6 is always "
0".

On the other hand, a timeout signal 7 which is an output of the monitoring timer 2 is connected to a timer monitoring circuit 3. Therefore, in this timer monitoring circuit 3, when the timeout signal T (FIG. 2(b)) is rOJ, the timer restart signal 5
When detected, the alarm signal 8 is set to "1" and output as an alarm. Further, when the timeout signal T is "1", the timer restart signal 5t is detected, and when the timeout signal T is "1", the alarm signal 8 is set to "0" and no alarm is issued.

In this way, according to this embodiment, by using two re-startable monitoring timers 1 and 2 to monitor abnormal operations of software that should run at regular intervals, detailed time monitoring can be performed. can.

〔Effect of the invention〕

As described above, the present invention includes first and second timers that can be started and started simultaneously by a command from software, and a timer that can be started when the software command is issued before the first timer times out. A case in which abnormal operation of software that is to be operated at a constant cycle is monitored by having a first monitoring means that outputs an alarm, and a second monitoring means that outputs an alarm when the second timer times out. The advantage is that detailed time monitoring can be performed. Furthermore, by providing multiple stages of monitoring functions, it is possible to perform detailed monitoring of each task in a multitasking system.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing the timing of each signal to explain the operation of the embodiment. 1.2・-゛・ζ sound monitoring timer, 311...-timer monitoring circuit, 4...-OR circuit, 5...φ-timer restart signal, 6,7...-timeout signal, 8・・・
...Alarm signal.

Claims (1)

[Claims] In monitoring abnormal operation of the software, first and second timers are provided which can be restarted by a command from the software, both of these timers are started simultaneously by the software command, and the first timer is restartable by a command from the software. and a second monitoring means that outputs an alarm when the second timer times out. Software monitoring method.