FC18 function not possible

What does 22297 mean?

This alarm indicates that a function request made by the PLC via the FC18 interface could not be executed. The alarm message includes a specific error code (e.g., 5 for switchover not possible, 23 for MD 30132 IS_VIRTUAL_AX set) that specifies the exact reason for the failure. This prevents NC Start in the affected channel, leading to production halts and potential process inconsistencies if the function is critical.

• PLC program attempting to call an FC18 function that is not enabled or supported by the current drive firmware version.
• Incorrect parameters supplied with the FC18 command from the PLC (e.g., invalid function code, incorrect axis number).
• Drive's internal state prevents the execution of the requested FC18 function (e.g., drive in fault state, safety interlock active).
• Communication error between the PLC and the drive preventing proper FC18 command transfer (e.g., Profinet/Profibus issue).
• Another PLC or HMI channel is simultaneously requesting a conflicting drive function, locking the resource.

Click steps to track your progress.

1. 1

   1. Verify the FC18 function call in the PLC program for correct function ID and associated data parameters (e.g., data block values).

2. 2

   2. Check the drive's firmware version against the FC18 function's compatibility list in the drive's functional manual.

3. 3

   3. Examine the drive's diagnostic buffer (e.g., r0945) for any active faults or inhibit conditions (e.g., A01600 - SI CU: STOP A initiated) that could block execution.

4. 4

   4. Monitor the communication status between the PLC and the drive (e.g., Profinet status LEDs) for any active communication faults.

5. 5

   5. Test the FC18 function with minimal parameters via an engineering tool (e.g., TIA Portal) to isolate PLC-specific issues.