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Siemens SINUMERIK Controller
Spindle · Intermediate · 30-120 minutes
Siemens 840D 10862 - Channel block master spindle also used as path axis
Alarm 10862 occurs when a contour program simultaneously uses the master spindle as a contouring axis (e.g., in a path) while also deriving feed velocity from spindle speed via G95 (feed per revolution). This creates a logical conflict: the spindle cannot function as both a synchronized axis reference and a velocity source for the same contour.
10862
Siemens 840D 10862 - Channel block master spindle also used as path axis
Channel block master spindle also used as path axis
Siemens SINUMERIK alarm 10862: Channel block master spindle also used as path axis. This alarm indicates a fault or error condition on the SINUMERIK 840D control. Refer to the Siemens SINUMERIK alarm documentation for the complete description and remedy.
Root Cause Summary
Alarm 10862 occurs when a contour program simultaneously uses the master spindle as a contouring axis (e.g., in a path) while also deriving feed velocity from spindle speed via G95 (feed per revolution). This creates a logical conflict: the spindle cannot function as both a synchronized axis reference and a velocity source for the same contour.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Review the NC program listing in the Siemens HMI (Diagnostics > Program > List). Identify blocks containing spindle axis designation (typically S-axis or C-axis depending to MD20050 RapidTurn configuration) combined with G95 or G94 feed commands.
Check MD20050 (RAPID_TURN_MODE) to confirm spindle axis assignment in your system configuration.
- 2
Modify the program: either remove the spindle from the contour path and use G94 (feed/minute) with separate spindle speed commands, or remove G95 and use G94 if spindle must remain in the contour.
- 3
If spindle threading is required, ensure G33 (rigid tapping) or G34/G35 (thread cutting) are used instead of G1 with spindle axis in the interpolation block.
- 4
Re-test the program after modification. Monitor MD10860 (SPINDLE_ALARM_ON_CONFLICT) parameter—if set to 1, the system will actively enforce this check.
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