Function Block Error
Beckhoff · EL6900 Operating Instructions
What does Diag3:off, Diag4:1_pulse mean?
This diagnostic flashing code (Diag 3 off, Diag 4: 1 uniform flash pulse) indicates a function block error within one of the TwinSAFE groups. This means that a component or logic block in the safety program is not operating as expected, potentially due to incorrect parameterization, invalid inputs, or an internal logic issue.
Common Causes
- An error has been detected within an active function block or application module.
- The function block failed to execute correctly or encountered an internal runtime error.
- Incorrect configuration or parameters passed to the function block.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Connect to the EL6900 using TwinCAT and examine the status of the TwinSAFE function blocks within the active safety project.
- 2
Verify the parameterization and interconnections of the function blocks identified as problematic in the safety logic, ensuring all inputs are valid.
- 3
Ensure that all input signals to the TwinSAFE groups are within their expected ranges and states by measuring actual signal levels if possible.