Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

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

Alarm 401902

Siemens 840D 401902 - Parameter ChanNo impermissible in FC19.

Siemens SINUMERIK alarm 401902: Parameter ChanNo impermissible in FC19. An impermissible or invalid parameter was passed to PLC function block FC19. This indicates a PLC programming error or configuration mismatch in the machine tool builder ladder program.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

401902

Siemens 840D 401902 - Parameter ChanNo impermissible in FC19.

Parameter ChanNo impermissible in FC19.

Siemens SINUMERIK alarm 401902: Parameter ChanNo impermissible in FC19. An impermissible or invalid parameter was passed to PLC function block FC19. 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 channel number passed to FC19 in the PLC program
  • FC19 called with a parameter that exceeds the valid range for this SINUMERIK configuration
  • PLC program version mismatch — FC19 call parameters not updated after a machine configuration change
  • Number of configured channels in SINUMERIK does not match the FC19 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 FC19 and verify the parameter values are within valid range.
  3. 3Compare the FC19 parameter against the actual number of configured channels in the SINUMERIK machine data.
  4. 4If the PLC program was recently modified or the machine configuration changed, verify FC19 calls were updated accordingly.
  5. 5Contact the machine tool builder if the PLC program source is not available for review.

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