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Siemens SINUMERIK Controller
Spindle · Basic · 5-10 minutes
Siemens 27001 - Axis error in a monitoring channel, code, values: NCK, drive
SIEMENS alarm 27001 occurs when the NCK cannot release the spindle from its held state due to missing enable signals, incomplete positioning commands, or active safety interlocks. The spindle remains locked until all permissive conditions from the PLC interface signals and drive system are restored.
27001
Siemens 27001 - Axis error in a monitoring channel, code, values: NCK, drive
Axis error in a monitoring channel, code, values: NCK, drive
Siemens SINUMERIK alarm 27001: Axis error in a monitoring channel, code, values: NCK, drive. Detailed remedy is being verified against the current Siemens diagnostics manual.
Root Cause Summary
SIEMENS alarm 27001 occurs when the NCK cannot release the spindle from its held state due to missing enable signals, incomplete positioning commands, or active safety interlocks. The spindle remains locked until all permissive conditions from the PLC interface signals and drive system are restored.
Safety
- Drive/power/encoder circuit: hazardous voltages may remain in the DC link after power-off. Lock out / tag out, wait for discharge per the drive documentation, and use qualified personnel only.
Causes and Fixes
- 1
Check PLC Interface Signals
Navigate to Diagnostics > PLC > Interface Signals and verify spindle enable DB31...DBX0.0 shows TRUE status.
Use VB31...VBX0.0 to monitor the actual signal state in real-time
- 2
Verify Machine Data Settings
Check MD30130 (CTRLOUT_TYPE) and MD30135 (CTRLOUT_MODULE_NR) for correct PLC interface configuration.
Incorrect interface settings can cause permanent spindle lockout
- 3
Test PLC Logic
In PLC program, force the spindle enable output TRUE and monitor if alarm clears using Service > PLC > Variable Status.
Call a technician if:
- ·Drive hardware failure detected
- ·PLC program modification required
- ·Safety system malfunction
Prevention
- Regular verification of PLC interface signals
- Periodic drive enable chain testing
- Proper M19 command sequencing in programs
Common Mistakes
- Forcing PLC enables without checking root cause
- Ignoring drive status indicators
- Bypassing safety interlocks temporarily
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