What causes Siemens SINUMERIK alarm 26025?

Parameter configuration error in the machine data for the affected axis or channel. Hardware fault on the axis drive or control module. Incorrect axis assignment or configuration in the SINUMERIK machine data. Software or firmware version incompatibility. Communication fault between NC and drive system.

How do I fix Siemens SINUMERIK alarm 26025?

1. Check the SINUMERIK alarm list for any sub-alarms or related alarms active at the same time. 2. Review the machine data parameters referenced in the alarm description for the affected axis. 3. Power cycle the machine to reset transient faults. 4. Check the SINAMICS drive diagnostics for the affected axis. 5. Consult the Siemens SINUMERIK alarm manual for alarm 26025 for detailed remedy instructions.

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Siemens SINUMERIK Controller

Overtravel/Limit · Intermediate · 30-120 minutes

Alarm 26025

Siemens 840D 26025 - Axis machine data changed

Alarm 26025 occurs when the NCK detects invalid machine data values in axis-specific parameters and automatically corrects them to valid ranges. This typically involves overtravel limits, velocity parameters, or acceleration values that violate system constraints or logical dependencies defined in the SINUMERIK control architecture.

Siemens SINUMERIKOvertravel/LimitIntermediate30-120 minutes

26025

Siemens 840D 26025 - Axis machine data changed

Axis machine data changed

Root Cause Summary

Alarm 26025 occurs when the NCK detects invalid machine data values in axis-specific parameters and automatically corrects them to valid ranges. This typically involves overtravel limits, velocity parameters, or acceleration values that violate system constraints or logical dependencies defined in the SINUMERIK control architecture.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Access Siemens HMI > Diagnostics > Machine Data > Axis-Specific Parameters. Navigate to MD32100, MD32101, MD32102 for the affected axis to review current values.
2
Verify that MD32101 (negative overtravel) is numerically less than MD32100 (positive overtravel). Confirm MD32102 reference offset does not exceed the total axis travel range (MD32100 + |MD32101|).
Incorrect overtravel hierarchy can cause unexpected axis position limits and collision risk.
3
Correct invalid values by recalculating based on mechanical axis specifications. Use Siemens SINUMERIK documentation Part 2 (Parameters) section 32xxx to confirm valid value ranges for your control version.
4
Power-cycle the control or use 'Activate' function in HMI to reload corrected machine data. Verify alarm clears and check NC trace log (Diagnostics > Monitoring > Trace) for confirmation of auto-correction values.

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