What causes Siemens SINUMERIK alarm 26024?

Parameter or machine data configuration error. Hardware fault on the NC or drive component. Part program error or illegal command. Communication fault between NC and drive or I/O modules. Software or firmware error requiring system restart.

How do I fix Siemens SINUMERIK alarm 26024?

1. Note the complete alarm text including any axis, channel, or block number values. 2. Check for related alarms active simultaneously in the SINUMERIK alarm list. 3. Power cycle the machine to clear transient faults. 4. Review the SINUMERIK machine data for parameters related to the alarm. 5. Consult the Siemens SINUMERIK alarm manual for alarm 26024 detailed remedy.

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Siemens SINUMERIK Controller

Overtravel/Limit · Intermediate · 30-120 minutes

Alarm 26024

Siemens 840D 26024 - Axis machine data value changed

Alarm 26024 indicates that the NCK software detected an invalid value in axis-specific machine data (MD) and automatically corrected it to a permissible range. This occurs when MD parameters controlling axis motion limits, acceleration rates, or velocity constraints fall outside hardware-defined boundaries or violate internal consistency rules.

Siemens SINUMERIKOvertravel/LimitIntermediate30-120 minutes

26024

Siemens 840D 26024 - Axis machine data value changed

Axis machine data value changed

Root Cause Summary

Alarm 26024 indicates that the NCK software detected an invalid value in axis-specific machine data (MD) and automatically corrected it to a permissible range. This occurs when MD parameters controlling axis motion limits, acceleration rates, or velocity constraints fall outside hardware-defined boundaries or violate internal consistency rules.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Navigate to Diagnostics > Machine Data > Axis Parameters. Locate MD3210 (pos. overtravel) and MD3220 (neg. overtravel) for the affected axis.
Note the auto-corrected values shown in the alarm message.
2
Verify MD3000 (axis length) is correctly dimensioned and compare against MD3210/MD3220. Ensure: MD3220 < 0 and MD3210 > 0, with |MD3220| + MD3210 ≤ MD3000.
3
If values are intentionally out of range, recalculate based on machine geometry. Edit MD3210 and MD3220 via Siemens HMI or NCK editor, then perform a 'Write MD to NCK' operation.
Always backup MD before modification using Service > Save/Restore > Save Machine Data.
4
Power-cycle the control or use Service > Reset Machine Data to reload corrected parameters. Verify no 26024 reoccurs on the next axis jog or program cycle.

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