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Siemens SINUMERIK Controller
System · Basic · 2-5 minutes
Siemens 27003 - Checksum error found:
SIEMENS alarm 27003 occurs when the NCK (Numerical Control Kernel) cannot complete its startup sequence and remains in reset state. This typically results from active safety circuits, unresolved drive faults, incomplete PLC communication, or corrupted system parameters preventing the transition to operational ready status.
27003
Siemens 27003 - Checksum error found:
Checksum error found
Checksum error in safety-relevant code or safety-relevant data. The safe monitoring functions (Safety Integrated) in the NCK could be affected Control reaction: Alarm display.
Root Cause Summary
SIEMENS alarm 27003 occurs when the NCK (Numerical Control Kernel) cannot complete its startup sequence and remains in reset state. This typically results from active safety circuits, unresolved drive faults, incomplete PLC communication, or corrupted system parameters preventing the transition to operational ready status.
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 Emergency Stop Status
Navigate to Diagnostics > PLC > PLC Status and verify DB21.DBX1.0 emergency stop signal is FALSE. Check all physical E-stop buttons are released and twisted counterclockwise.
Never bypass safety circuits - resolve the actual safety condition first
- 2
Verify Safety Door Interlocks
In PLC diagnostics, check safety door input signals (typically DB21.DBX1.1 to DBX1.7). Ensure all machine guards and doors are properly closed and latched.
Use PLC variable table to monitor safety I/O in real-time during door operation
- 3
Reset Safety System
After confirming all safety conditions are met, press the NC START button or execute RESET command from HMI. Monitor NCK state transition in Diagnostics > NC > NCK Status.
Some systems require a two-stage reset: first PLC reset, then NC reset
Call a technician if:
- ·Drive hardware faults persist after parameter checks
- ·PLC program requires modification
- ·Parameter corruption affects multiple machine data areas
- ·Safety system hardware malfunction suspected
Prevention
- Create regular machine data backups via Archive function
- Monitor drive status during routine maintenance
- Implement proper shutdown procedures to avoid parameter corruption
- Verify safety circuit wiring connections during preventive maintenance
Common Mistakes
- Attempting to bypass safety circuits instead of resolving root cause
- Clearing drive faults without checking mechanical conditions
- Modifying machine data without backup
- Ignoring PLC program errors and forcing NCK reset
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