2. ITEMS MONITORED BY THE RAS FEATURE
2-9
2.7.2 Using a watchdog timer for monitoring a user program
In order to use a watchdog timer for monitoring the operational state of a user program,
you can use a configuration, for example, where the user program periodically retriggers
the watchdog timer (that is, resets the timeout counter of the watchdog timer to the initial
value) and another program checks whether timeout occurs for the watchdog timer. The
flow chart for this configuration is shown below.
Figure 2-2 Example of a Flow Chart of Monitoring the Operational State of a User Program
Process a user-defined
routine
Trigger
the watchdog timer
Watchdog
timer
Retrigger
Check whether
timeout occurs for
the watchdog timer
Get the value of the
timeout counter
Monitoring program
Monitored program
HF-W
Содержание HF-W7500 40
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