What causes Siemens SINUMERIK alarm 26050?

The parameter block change cannot be performed without jumps.. This is due to the content of the parameter block to be switched on, e.g. different load gear factors.

How do I fix Siemens SINUMERIK alarm 26050?

1. In the following cases, the parameter block change is carried out via MD31060 $MA_DRIVE_AX_RATIO_NUMERA and MD31050 $MA_DRIVE_AX_RATIO_DENOM without an alarm, even with different load gear ratio settings: 1. 2. If no position control is active (e.g. in follow-up mode or if spindle is in speed-controlled mode). 3. 2. 4. For position control with the direct encoder. 5. 3. 6. For position control with the indirect encoder (the calculated load position difference must not exceed the value indicated in MD36500 $MA_ENC_CHANGE_TOL). 7. Clear alarm with the RESET key. Restart part program

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Siemens SINUMERIK Controller

Overtravel/Limit · Intermediate · 30-120 minutes

Alarm 26050

Siemens 26050 - Axis parameter set change from to not possible

Alarm 26050 occurs when attempting to switch between parameter blocks (via MD20070 or MD20071) while the axis contains incompatible kinematic or load data that would cause discontinuous motion. The NCK cannot perform a smooth parameter set transition due to mismatched MD10210 (load gear factor) or similar axis-dependent parameters between the source and target parameter blocks.

Siemens SINUMERIKOvertravel/LimitIntermediate30-120 minutes

26050

Siemens 26050 - Axis parameter set change from to not possible

Axis parameter set change from to not possible

Root Cause Summary

Alarm 26050 occurs when attempting to switch between parameter blocks (via MD20070 or MD20071) while the axis contains incompatible kinematic or load data that would cause discontinuous motion. The NCK cannot perform a smooth parameter set transition due to mismatched MD10210 (load gear factor) or similar axis-dependent parameters between the source and target parameter blocks.

Safety

Drive/power/encoder circuit: hazardous voltages may remain in the DC link after power-off. Lock out / tag out, wait for discharge per the drive documentation, and use qualified personnel only.
Spindle hazard: ensure the spindle is at standstill before working near it; follow lockout/tagout procedures.

Causes and Fixes

1
Access SINUMERIK Operate → Diagnostics → Alarms → 26050. Note the axis designation (%1) and the parameter block numbers (%2 source, %3 target).
2
In NCK → Machine Data → Axis Parameters, navigate to MD10210 for the source parameter block. Record the load gear factor value.
3
Switch to the target parameter block context and verify MD10210 value matches the source. If different, align both blocks to the same value or use axis positioning (G0 to safe position) before block switching.
Do not force parameter block switching; mismatched gear factors will cause axis jumps when motion resumes.
4
If values must remain different, structure NC program to include explicit axis stop and repositioning between parameter block changes using G0 commands after block activation.

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