Honeywell 51199188-100 Hardware Watchdog Timer
Function:
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Hardware Watchdog Timer: Ensures system reliability and safety by monitoring the controller's operation.
Operation:
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Periodic Refresh: The watchdog timer is refreshed periodically during normal controller operation.
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Failure Handling: If the refresh does not occur within the required time interval, the controller suspends control execution and enters a fail-safe state.
Indicators:
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Timeout Response: In the event of a hardware watchdog timeout:
- The controller faceplate display may become blank.
- The Status LED will blink red in ¼-second intervals, indicating the failure.
Purpose:
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Fail-Safe State: Ensures that the controller achieves a fail-safe state in the event of a catastrophic failure disrupting internal instruction execution or timing.
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