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.

• Both an error within a function block and a communication error have been detected simultaneously.
• The function block error may be a consequence of communication issues, or vice versa.
• Complex failure involving both application logic and network connectivity.

Click steps to track your progress.

1. 1

   Address potential communication errors first by verifying EtherCAT cabling and slave statuses in the TwinCAT System Manager.

2. 2

   Subsequently, investigate TwinSAFE function block parameters and logic within TwinCAT, checking for invalid states or unexpected outputs, similar to a 'Function Block Error' scenario.

3. 3

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