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Siemens SINUMERIK Controller
Overtravel/Limit · Intermediate · 30-120 minutes
Siemens 26007 - Axis QEC: invalid coarse step size
Alarm 26007 fires when the QEC (Quick Electronic Calibration) coarse step size parameter is configured outside the valid range of 1 to MD 18342 (MM_QEC_MAX_POINTS, default 1025). This memory constraint prevents allocation of excessive QEC calibration point arrays in the NCK memory space, which would corrupt system memory or prevent proper QEC execution.
26007
Siemens 26007 - Axis QEC: invalid coarse step size
Axis QEC: invalid coarse step size
The course step width for QEC must be within the range 1 <= course step width <= maximum value of MD18342 $MN_MM_QEC_MAX_POINTS (currently 1025), because a greater number of values would exceed the available memory space Control reaction: Alarm display.
Root Cause Summary
Alarm 26007 fires when the QEC (Quick Electronic Calibration) coarse step size parameter is configured outside the valid range of 1 to MD 18342 (MM_QEC_MAX_POINTS, default 1025). This memory constraint prevents allocation of excessive QEC calibration point arrays in the NCK memory space, which would corrupt system memory or prevent proper QEC execution.
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
Access Diagnostics menu: Siemens HMI > Service > Diagnostics > Parameters > Machine Data. Navigate to axis-specific parameters and locate MD 18340 (MM_QEC_COARSE_STEP_WIDTH) for the affected axis.
- 2
Verify the current value of MD 18342 (MM_QEC_MAX_POINTS) on the same axis. Default is typically 1025 points. Check against actual memory allocation in your machine commissioning documentation.
- 3
Reduce MD 18340 value to fall within the range 1 to MD 18342. For example, if MD 18342 = 1025, set MD 18340 to a value ≤ 1025. Common values range from 10 to 100 depending on axis travel distance.
Do not increase MD 18342 beyond 1025 without memory recalculation by Siemens support; this will cause NCK memory overflow.
- 4
Save changes and perform a warm restart (POWER ON/OFF cycle) to reload machine data. Verify alarm clears and QEC mode can be entered without 26007 recurrence.
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