SIEMENS alarm 1001 indicates that a Safety Integrated function has been triggered, placing axes into a safe monitored state (STO, SS1, SLS, etc.). The alarm serves as a supervisory flag while the actual safety violation is detailed in companion 60xxxx NCK safety or 20xxxx/30xxxx SINAMICS safety alarms.
Siemens SINUMERIKSystemBasic5-15 minutes
1001
Siemens 1001 - 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: Mode group not ready. Channel not ready. Interface signals are set. Alarm display.
Root Cause Summary
SIEMENS alarm 1001 indicates that a Safety Integrated function has been triggered, placing axes into a safe monitored state (STO, SS1, SLS, etc.). The alarm serves as a supervisory flag while the actual safety violation is detailed in companion 60xxxx NCK safety or 20xxxx/30xxxx SINAMICS safety alarms.
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 Physical Safety Devices
Verify all E-stop buttons are released and safety doors/guards are properly closed and latched.
Never bypass safety devices - ensure all personnel are clear before reset
2
Examine Safety Chain Status
Navigate to Diagnostics > Drive > Safety and check F-DI status for safety inputs SI_0 through SI_5 on each SINAMICS drive unit.
Green indicators show active safety inputs - all should be green for normal operation
3
Reset Safety System
Press machine RESET button, then execute safety acknowledgment via HMI Safety menu or MD36010 (SAFE_ACKNOWLEDGE) parameter reset.
Some systems require holding RESET for 3+ seconds for proper safety chain reset
4
Verify Drive Ready Status
Check SINAMICS r0899.31 (Safety function active) bit is cleared and r0002.0 (Drive ready) is set before attempting axis movement.
1
Identify Violating Axis
Check companion alarm 20xxx or 30xxx to identify which axis triggered SLS, then review SINAMICS r9774 (SLS actual speed) vs p9501 (SLS limit).
SLS violations often occur during rapid traverse or incorrect feed override settings
2
Verify Speed Monitoring Parameters
Navigate to Drive Parameters > Safety and confirm p9501 SLS speed limit matches machine requirements and p9502 SLS tolerance is appropriate.
Only qualified safety personnel should modify safety speed limits
3
Check Program Feed Rates
Review active NC program for excessive F-word values or verify feed override (MD11050) and rapid override (MD11060) settings are within safe limits.
4
Reset and Test Movement
Execute safety reset sequence, then test axis movement at reduced feed rates to verify SLS monitoring is functioning correctly.
1
Check Position Violation
Review SINAMICS r9784 (SLP actual position) against p9531 (SLP limit 1) and p9532 (SLP limit 2) to identify boundary violation.
SLP violations often indicate work offset errors or incorrect G54-G59 coordinate system setup
2
Verify Machine Coordinate System
Navigate to Machine > Reference Point and confirm all axes are properly referenced, check MD36100 (WORKPIECE_ZERO_OFFSET) settings.
3
Review Work Coordinate Offsets
Check active work offset values (G54-G59) in HMI Offset menu and verify they don't place workpiece outside safe working envelope.
4
Manual Position Recovery
After safety reset, use JOG mode to manually move axis back within safe position limits before resuming automatic operation.
Ensure adequate clearance from workpiece and fixtures during manual recovery
1
Compare Safety Parameter Sets
Cross-reference NCK MD36020 (SAFE_FUNCTION_ENABLE) with SINAMICS p9501-p9599 safety function parameters for consistency.
Use SINAMICS Startdrive safety configuration tool to verify parameter coherency
2
Check Safety Signature
Verify SINAMICS p9999 (Safety signature) matches the calculated CRC from safety parameter set - mismatch indicates configuration corruption.
3
Validate Communication Setup
Confirm PROFIsafe communication parameters p9601 (F-destination address) and p9602 (F-source address) match NCK safety channel configuration.
4
Reload Safety Configuration
If parameters are corrupted, reload safety configuration from backup or reconfigure using SINAMICS Safety Integrated commissioning tool.
Safety parameter changes require qualified safety engineer approval and validation
1
Check PROFIsafe Status
Monitor SINAMICS r9722.0 (PROFIsafe telegram error) and r9722.1 (PROFIsafe timeout) bits for communication faults.
Intermittent r9722 faults often indicate EMI interference or cable issues
2
Verify Network Diagnostics
Use HMI Diagnostics > PROFIBUS/PROFINET to check safety channel status and monitor cycle times for excessive jitter.
3
Inspect Safety Cabling
Examine PROFIsafe network cables for damage, proper shielding, and secure connections at NCK and drive terminals.
Use only approved PROFIsafe cables - standard PROFIBUS cables may not meet safety integrity requirements
4
Reset Communication Channel
Power cycle SINAMICS drives in sequence, then reset NCK safety communication via MD36030 (SAFE_RESET_MODE) parameter.
