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Siemens SINUMERIK Controller
System · Basic · 10-20 minutes
Siemens 61000 - No tool offset active
SIEMENS alarm 61000 fires when the NC interpolation cycle time or PLC cycle time exceeds the warning threshold defined in machine data MD10081 (IPO_SYSCLOCK_TIME_RATIO) or related timing parameters. This indicates the real-time control system is experiencing excessive computational load, often due to complex part programs, network communication delays, or hardware performance degradation.
61000
Siemens 61000 - No tool offset active
No tool offset active
Control reaction: Interpreter stop NC Start disable in this channel. Interface signals are set. Alarm display.
Root Cause Summary
SIEMENS alarm 61000 fires when the NC interpolation cycle time or PLC cycle time exceeds the warning threshold defined in machine data MD10081 (IPO_SYSCLOCK_TIME_RATIO) or related timing parameters. This indicates the real-time control system is experiencing excessive computational load, often due to complex part programs, network communication delays, or hardware performance degradation.
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 PLC Cycle Time Diagnostics
Navigate to HMI > Diagnostics > PLC > Cycle Times. Monitor OB1 execution time and compare against MD11210 (PLC_CYCLE_TIME_LIMIT).
Look for cycle times consistently above 4-8ms on standard systems
- 2
Analyze PLC Program Load
In STEP 7, check program block execution times using 'Program Info' and identify resource-intensive functions or loops in OB1.
Do not modify PLC code during production without proper backup
- 3
Optimize Critical PLC Functions
Move non-critical PLC functions to lower priority OBs (OB32-OB38) or increase their cycle intervals to reduce OB1 load.
Call a technician if:
- ·Hardware diagnostics show NCU failure
- ·Network analysis requires specialized test equipment
- ·PLC program modifications needed beyond operator scope
Prevention
- Regular monitoring of cycle time diagnostics
- Periodic PLC program optimization
- Preventive network cable and connector maintenance
- Baseline performance documentation for trending
Common Mistakes
- Ignoring warning until hard fault occurs
- Modifying MD10081 threshold without addressing root cause
- Adding more I/O without checking bus capacity
- Disabling alarm instead of investigating cause
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