Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Program/G-code · Intermediate · 30-120 minutes

Alarm 402401

Siemens 840D 402401 - Parameter BAGNo impermissible in FC24

Siemens SINUMERIK alarm 402401: Parameter BAGNo impermissible in FC24. An impermissible or invalid parameter was passed to PLC function block FC24. This indicates a PLC programming error or configuration mismatch in the machine tool builder ladder program.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

402401

Siemens 840D 402401 - Parameter BAGNo impermissible in FC24

Parameter BAGNo impermissible in FC24

Siemens SINUMERIK alarm 402401: Parameter BAGNo impermissible in FC24. An impermissible or invalid parameter was passed to PLC function block FC24. This indicates a PLC programming error or configuration mismatch in the machine tool builder ladder program.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Invalid parameter value passed to FC24 in the PLC program
  • FC24 called with a parameter that exceeds the valid range for this SINUMERIK configuration
  • PLC program version mismatch — FC24 call parameters not updated after a machine configuration change
  • Number of configured spindles in SINUMERIK does not match the FC24 parameter
  • PLC program downloaded with incorrect machine data for this specific machine tool

Troubleshooting Steps

  1. 1Check the SINUMERIK PLC alarm details for the specific parameter value that caused the error.
  2. 2Review the PLC program — find the call to FC24 and verify the parameter values are within valid range.
  3. 3Compare the FC24 parameter against the actual number of configured spindles in the SINUMERIK machine data.
  4. 4If the PLC program was recently modified or the machine configuration changed, verify FC24 calls were updated accordingly.
  5. 5Contact the machine tool builder if the PLC program source is not available for review.

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