SINUMERIK Alarm 1000 occurs when the NC kernel fails to complete its boot sequence and cannot establish communication with critical system components. This typically results from hardware initialization failures, corrupted system files, or safety circuit interruptions that prevent the control from reaching operational ready state.
Siemens SINUMERIKSystemBasic5 - 30 minutes
1000
Siemens 1000 - System error
System error
With this alarm, internal alarm states are displayed that, in conjunction with the transferred error number, provide information on the cause and location of the error Control reaction: NC not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm.
Root Cause Summary
SINUMERIK Alarm 1000 occurs when the NC kernel fails to complete its boot sequence and cannot establish communication with critical system components. This typically results from hardware initialization failures, corrupted system files, or safety circuit interruptions that prevent the control from reaching operational ready state.
Safety
Only qualified personnel should diagnose and clear control alarms; follow the machine builder's safety procedures and lockout/tagout where hardware work is required.
Causes and Fixes
1
Check Boot Diagnostics
Access HMI Diagnostics → System Data → Boot Messages to review NCK startup log for file system errors or missing components.
Look specifically for 'NCK_BOOT.INI' and system partition errors in the boot log
2
Verify CompactFlash Integrity
Navigate to Commissioning → System → Memory Card and run file system check. Replace CompactFlash if bad sectors detected.
Always power down system completely before removing CompactFlash card
3
Restore System Backup
Load known good system backup via Commissioning → Backup/Restore → Complete Backup to restore corrupted NCK files.
Keep multiple dated backups - corruption can occur gradually over time
4
Perform Cold Restart
Execute complete system cold start via HMI: Diagnostics → Control → Cold Restart to reinitialize all NCK components.
Cold restart will clear all temporary data and require axis reference
1
Check F-SW Status
Navigate to Diagnostics → Safety → F-SW Status and verify all safety modules show 'RUN' state without fault indicators.
F-SW must complete its own initialization before NCK can proceed to ready state
2
Verify Safety Parameter Consistency
Access Safety → Configuration → F-Parameters and compare safety signature with commissioned values using parameter P9601 (F-SW signature).
Never modify safety parameters without proper safety engineering authorization
3
Reset Safety System
Perform F-SW reset via Safety → Service → F-SW Reset, then monitor initialization sequence in safety diagnostics.
Safety reset requires physical acknowledgment at safety input terminals
4
Check PROFISAFE Communication
Verify PROFISAFE telegram status in Diagnostics → Hardware → PROFIBUS/PROFINET for safety I/O communication integrity.
PROFISAFE timeouts will prevent NCK ready state - check network load and cable integrity
1
Check Drive Communication Status
Access Diagnostics → Drive → Overview and verify all configured axes show 'Ready' status without communication alarms.
Look for specific DRIVE-CLiQ topology errors or PROFIBUS address conflicts
2
Verify Drive Parameters
Check machine data MD30100 (axis assignment) and MD30110 (drive assignment) for correct drive addressing and configuration.
Incorrect drive addressing can cause multiple axis communication failures
3
Reset Drive Communication
Execute drive reset via Commissioning → Drive → Reset Drives, then monitor drive initialization in real-time diagnostics.
SINAMICS drives must complete power-on self-test before NCK communication is possible
4
Check Network Configuration
Verify PROFINET/PROFIBUS configuration in HW Config matches physical drive addresses and update topology if necessary.
Network topology changes require complete system restart to take effect
1
Check License Status
Navigate to Commissioning → System → Licenses and verify all required NCK licenses show 'Valid' status without expiration warnings.
Pay attention to axis licenses and technology function licenses - missing licenses prevent NCK ready
2
Verify Hardware ID
Compare displayed Hardware ID in license screen with license certificate to ensure hardware binding is correct.
Hardware changes may invalidate existing licenses requiring re-licensing
3
Reinstall License Files
Remove and reinstall license files via license management interface, ensuring proper license file format and content.
Keep backup copies of all license files on external media for quick recovery
1
Check Hardware Diagnostics
Access Diagnostics → Hardware → System Components and review all hardware status indicators for fault conditions.
Hardware failures may require immediate system shutdown to prevent further damage
2
Monitor System Temperatures
Verify NCU temperature readings in Diagnostics → Hardware → Temperature are within normal operating ranges (typically <60°C).
Overheating can cause intermittent hardware failures and system instability
3
Test Memory Integrity
Run memory test via Diagnostics → System → Memory Test to identify potential RAM or storage device failures.
Memory failures can cause data corruption - backup critical data immediately if memory errors detected
DIY Feasiblemedium confidence
Call a technician if:
·Hardware component failures detected
·Safety system modifications required
·Multiple system backups fail to resolve issue
·Drive communication cannot be restored
Prevention
Maintain regular system backups including NCK and safety data
Monitor CompactFlash health and replace proactively
Keep spare licensed CompactFlash cards available
Implement UPS protection to prevent power-related corruption
Common Mistakes
Attempting to modify safety parameters without proper authorization
Ignoring gradual boot time increases indicating storage degradation
Not verifying license validity after hardware changes
Performing warm restarts when cold restart is required for full initialization
