Watchdog Timer Monitoring; Automatic Retriggering Feature For A Watchdog Timer - Hitachi HF-W6500 45/40 Feature Manual

2. ITEMS MONITORED BY THE RAS FEATURE

2.7 Watchdog Timer Monitoring

This equipment has a watchdog timer. By retriggering a watchdog timer automatically, this
function monitors whether processes are scheduled properly. In addition, this function can be
used, for example, for monitoring the operational state of a user program by using dedicated
library functions.

2.7.1 Automatic retriggering feature for a watchdog timer

This feature is implemented on a process retriggering a watchdog timer periodically. This
process runs at the lowest priority (idle priority class). If the amount of CPU time used by
processes with a priority higher than the idle priority class exceeds the set value, the
watchdog timer is timed out. By using this feature, you can detect a runaway application
process and so on.
You can set up the watchdog timer timeout and the retrigger interval in the RAS Setup
window. For information about how to use the RAS Setup window, see "3.1.3 Using the
RAS Setup window". The default factory settings are as follows.
Timeout
Retrigger interval
60 (seconds)
20 (seconds)
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