Internal PROFIsafe F-Device Error

What does 43 mean?

An internal error has occurred within the PROFIsafe F-Device functionality of the safety PLC. This indicates a critical malfunction that could compromise the integrity and reliability of safety functions within the system. If left unaddressed, the safety PLC may not operate correctly or may fail to perform its safety-critical tasks.

• Corrupted firmware on the PROFIsafe F-Device (e.g., safety I/O module, safety drive) preventing proper initialization of safety functions.
• Internal hardware defect within the F-Device module (e.g., processor failure, memory error) affecting its safety-related operations.
• Parameterization error within the F-Device, where an internal safety parameter (e.g., safety monitoring time) is configured outside its permissible range.
• Over-temperature condition or power supply instability specific to the F-Device leading to internal component malfunction.

Click steps to track your progress.

1. 1

   Read the detailed diagnostic buffer of the safety PLC and the F-Device (e.g., using TIA Portal diagnostics) for specific sub-error codes or messages.

2. 2

   Power cycle the entire safety PLC and the F-Device by removing and re-applying main power supply to clear transient internal states.

3. 3

   Verify the power supply voltage (e.g., 24VDC) at the F-Device terminals is stable and within the specified operating range (e.g., 21.6V to 26.4V).

4. 4

   Attempt to re-download the F-Device configuration and firmware (if applicable) from the engineering software to the F-Device.

5. 5

   Isolate the F-Device by removing it from the PROFINET network and observe if other safety devices remain operational, indicating a device-specific fault.

6. 6

   Replace the suspected faulty F-Device module if the fault persists after verifying cabling and network environment.