Function Block and Communication Error

What does Diag3:off, Diag4:3_pulses mean?

This diagnostic flashing code (Diag 3 off, Diag 4: 3 flash pulses with longer pause) signifies both a function block error and a communication error within one of the TwinSAFE groups. This combined fault suggests issues with both the internal logic processing and the external data exchange within the safety system, indicating a complex problem requiring thorough investigation of both aspects.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Review recent changes to the safety project or hardware configuration that could simultaneously affect both communication and safety logic execution.