What causes Siemens SINUMERIK alarm 401702?

Invalid spindle interface number passed to FC17 in the PLC program. FC17 called with a parameter that exceeds the valid range for this SINUMERIK configuration. PLC program version mismatch — FC17 call parameters not updated after a machine configuration change. Number of configured spindles in SINUMERIK does not match the FC17 parameter. PLC program downloaded with incorrect machine data for this specific machine tool.

How do I fix Siemens SINUMERIK alarm 401702?

1. Check the SINUMERIK PLC alarm details for the specific parameter value that caused the error. 2. Review the PLC program — find the call to FC17 and verify the parameter values are within valid range. 3. Compare the FC17 parameter against the actual number of configured spindles in the SINUMERIK machine data. 4. If the PLC program was recently modified or the machine configuration changed, verify FC17 calls were updated accordingly. 5. Contact the machine tool builder if the PLC program source is not available for review.

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Siemens SINUMERIK Controller

Spindle · Intermediate · 30-120 minutes

Alarm 401702

Siemens 840D 401702 - Impermissible spindle IF no. parameter in FC 17

Alarm 401702 fires when FC 17 (Spindle Function Call) references a spindle interface number that does not exist in the NCK spindle configuration. This occurs because the parameterized spindle IF (Interface) number in the part program or PLC does not match any configured spindle in the machine parameter set.

Siemens SINUMERIKSpindleIntermediate30-120 minutes

401702

Siemens 840D 401702 - Impermissible spindle IF no. parameter in FC 17

Impermissible spindle IF no. parameter in FC 17

Root Cause Summary

Alarm 401702 fires when FC 17 (Spindle Function Call) references a spindle interface number that does not exist in the NCK spindle configuration. This occurs because the parameterized spindle IF (Interface) number in the part program or PLC does not match any configured spindle in the machine parameter set.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Check the part program or PLC source code for the FC 17 call. Identify the spindle IF number parameter being passed (typically the first parameter in FC 17).
2
Navigate to Siemens HMI > Diagnosis > Parameters > Machine Data and verify MD 30100 (Number of Spindles). Note the configured count.
Ensure the spindle IF number in FC 17 does not exceed the value in MD 30100.
3
Correct the spindle IF number in the part program or PLC to match an existing spindle (1 to N, where N = MD 30100). Recompile and reload the NC program.
4
Execute a dry run to confirm the alarm no longer fires and the correct spindle is addressed.

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