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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-60 minutes
Siemens 840D 61421 - Channel block: Software release of measuring cycles or NCK
The alarm can be triggered by the following measuring cycles: CYCLE996 Remedy: Causes of error: 1. Error code = A
61421
Siemens 840D 61421 - Channel block: Software release of measuring cycles or NCK
Channel block: Software release of measuring cycles or NCK
The alarm can be triggered by the following measuring cycles: CYCLE996 Remedy: Causes of error: 1. Error code = A
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Common Causes
- NCK software version is incompatible with the measuring cycle software release
- CYCLE996 measuring cycle file is corrupted or not properly installed
- Mismatch between control software version and optional measuring cycle package version
- Missing or outdated measuring cycle library files in system memory
- Incomplete software update installation leaving inconsistent version states
Troubleshooting Steps
- 1Verify NCK software version matches the required release level for CYCLE996 by checking Settings > System Information > Software Version
- 2Confirm measuring cycle package version compatibility using Siemens documentation for your specific control model
- 3Reinstall or update the measuring cycles software package from official Siemens distribution media or service portal
- 4Clear control memory and reload measuring cycle files by performing a controlled power cycle and re-initializing the system
- 5Contact Siemens service support with the complete error log and software version details if mismatch persists after reinstallation
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