FabiaTech FR9100, User Manual

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FabIATech Corporation
57
Watchdog Timer Setting
The watchdog timer is a circuit that may be used from your program software to
detect system crashes or hang-ups. The Watch/Power LED on front panel is the
watchdog timer indicator, which is located at left side on the front panel.
Whenever the watchdog timer is enabling, the Power/Watchdog LED will blink to
indicate that the timer is counting. The watchdog timer is automatically disabled
after reset.
Once you have Enable the watchdog timer, your program must trigger the
watchdog timer every time before it times out. After you trigger the watchdog
timer, it will be set to non-zero value to watchdog counter and start to count down
again. If your program fails to trigger the watchdog timer before time-out, it will
generate a reset pulse to reset the system.
The factor of the watchdog timer time-out constant is approximately 1 second.
The period for the watchdog timer time-out is between 1 to FF timer factors.
If you want to reset your system when watchdog times out, the following table
listed the relation of timer factors between time-out periods.
Time Factor
Time-Out Period
(Seconds)
Time-Out Period
(Minutes)
1 1 1
2 2 2
3 3 3
4 4 4
5 5 5
“ “ “
“ “ “
“ “ “
FF FF FF