Controller Runtime Failure

What does FAIL mean?

This fault indicates a critical issue within the controller's IEC 61131 runtime system. It can either mean a runtime error has occurred in the application program or, more severely, the controller's hardware watchdog has been triggered, signifying a system lock-up or critical malfunction.

• A runtime error has occurred within the IEC 61131 application program.
• The controller's hardware watchdog has been triggered.

Click steps to track your progress.

1. 1

   Connect to the controller with PC Worx Engineer and check the diagnostic logs for specific runtime error messages.

2. 2

   Review the IEC 61131 application program for logical errors, array out-of-bounds access, or resource exhaustion.

3. 3

   If the hardware watchdog is triggered, perform a power cycle on the controller.

4. 4

   Isolate potentially problematic sections of the application program by disabling/enabling parts to pinpoint the cause of the watchdog trigger.