WATCHDOG TIMER EXPIRED, SEE S:3

What does 0022 mean?

The program scan time exceeded the configured watchdog timeout value, which is stored in status file S:3H. This is a nonrecoverable fault, indicating that the controller's program took too long to execute, potentially due to an infinite loop, excessive processing, or an incorrectly set watchdog timer.

• Program logic is caught in an infinite or excessively long loop.
• Excessive processing load due to complex calculations or communication tasks during a single scan.
• Watchdog timeout value in status file S:3H is set too low for the program's complexity and execution time.

Click steps to track your progress.

1. 1

   Review the program logic to identify and correct any infinite loops or sections that take an extended time to execute.

2. 2

   Increase the watchdog timeout value in status file S:3H, but ensure it remains appropriate for the application's safety and response time requirements.