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Access machine data via HMI: Service > Machine Data > Display/Edit. Check MD20070 $MC_AXCONF_GEOAX_NAME_TAB for each channel to verify geometry axis assignments (X, Y, Z, etc.).

Verify MD20080 $MC_AXCONF_GEOAX_ASSIGN_TAB contains valid machine axis numbers corresponding to the geometry axes. Ensure no duplicate assignments or out-of-range values exist.

Cross-reference with MD10000 $MN_AXCONF_MACHAX_NAME_TAB to ensure all machine axes referenced in geometry axis assignments are properly defined at the NCK level.

Backup all machine data before making changes using Archive/Backup function

If corruption is found, restore machine data from a known good backup or manually correct the invalid entries, then perform a complete NCK reset (Power Off > Power On cycle).

Complete NCK reset will clear all current part programs in memory

Review alarm log timestamps and check if alarm occurs during NCK boot sequence. Navigate to Diagnostics > Alarms > Alarm Log to identify if error appears at startup or during specific program execution.

Verify MD20090 $MC_AXCONF_GEOAX_CONF_POS_TAB and MD20095 $MC_AXCONF_GEOAX_CONF_DIR_TAB are properly configured for all active geometry axes in the affected channel.

Check MD10010 $MN_AXCONF_LOGIC_MACHAX_TAB for logical axis configuration consistency. Ensure the number of configured axes matches the actual hardware and geometry requirements.

Perform a controlled NCK restart: Service > Start-up > Reset Machine Data active. If alarm persists, execute complete system reboot including PLC reset.

PLC reset may affect auxiliary functions; coordinate with production schedule

Check battery status: Diagnostics > Service > Battery. If battery voltage is low or SRAM data loss occurred, system configuration may be corrupted.

Boot into Single User Mode or use Service Boot Stick to access file system. Check integrity of /user/sinumerik/data and /oem directories for configuration files.

Single User Mode access requires password and should be coordinated with machine builder

If recent software update was performed, restore complete system backup from immediately before update using Commissioning > Archive > Restore function.

Full system restore will overwrite all current settings and programs

If no backup available, contact machine builder or Siemens support for OEM-specific machine data set. Reload base parameter set and reconfigure geometry axis assignments from machine documentation.

Requires complete recommissioning and axis calibration procedures