Rockwell Automation T6200 Compressor Anti-Surge and Capacity Controller - Manual (Page 65)

T6200 Controller Operation
5-7
Watchdog Timer
The microprocessor toggles the watchdog timer at least once every 100 milliseconds. If the watchdog
timer is not toggled within this time period, the watchdog timer will reset the microprocessor. If the board
is on standby, the outputs will be disabled. If the board is active, control will be transferred to the backup
board. If there is no backup board or if the OUT LED is illuminated, the outputs will remain at the
condition before the watchdog timer reset the microprocessor.
If the microprocessor does not start after being reset, the watchdog timer will continue to reset the
microprocessor every 1.6 seconds. If the microprocessor does restart in a redundant system, the board will
remain in the standby mode. If there is no backup board, the primary board will resume the active mode.