CU Safety Test Stop Fault

What does F01773 mean?

A safety test stop fault has occurred on the Control Unit (CU) side, specifically indicating that the expected states of the Digital Outputs (DOs) were not fulfilled during a safety test. This means the external readback signal was not set correctly for a given test stop state (e.g., state 7), where an expected value was not observed. This issue compromises the validation of safety functions.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If multiple test stop faults exist, clearing the current one will allow the next queued fault to be signaled for diagnosis.