GROUPERR_WATCHDOG (customer specific error code)

What does 42FF mean?

A watchdog timer for the group has expired, signaling a critical delay or unresponsiveness in the system's processing of group-related tasks. As this is a customer-specific error code, it points to a potential issue in the customer's application logic, configuration, or system load causing the processing delay.

• Customer-specific application logic is executing for an excessive duration, blocking the main control loop and causing a watchdog timeout.
• Overload of the controller's CPU resources due to an excessive number of active tasks or complex calculations within the customer-specific group.
• Communication fault or delay between the main controller and a peripheral module responsible for group-related tasks, preventing timely responses.
• Improper configuration of the watchdog timer parameter (e.g., P7-03) for the customer-specific group, making it too sensitive for the actual task execution time.
• Deadlock condition within the customer-specific software preventing critical group-related processes from completing or releasing resources.

Click steps to track your progress.

1. 1

   1. Access the PLC or NC program editor and review the customer-specific group processing logic for inefficient code or infinite loops.

2. 2

   2. Monitor the controller's CPU utilization via diagnostic screen D-05 or similar, identifying sustained peaks above 90% during group operations.

3. 3

   3. Verify the communication status and cyclic update times for all modules involved in the customer-specific group via system diagnostics (e.g., Ethernet/IP module status).

4. 4

   4. Adjust the watchdog timer parameter (P7-03, Group Watchdog Time) in small increments, ensuring it accommodates the expected execution time without masking actual faults.

5. 5

   5. Implement additional logging within the customer-specific code to pinpoint the exact subroutine or instruction that is causing the delay or unresponsiveness.