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Access SINUMERIK HMI Commissioning mode, navigate to Machine Data and review MD134 (check channel and axis assignments).

Cross-check MD400 series parameters (MD20100-MD20140 for general settings) and verify they align with configured channels and axes in MD134.

Compare current machine data with archived backup or default values to identify discrepancies. Use 'Compare Machine Data' function in commissioning.

Document all original values before making changes

Correct conflicting values, perform a Power On Reset (cycle key switch), and verify alarm clears. Check alarm buffer for any related secondary alarms.

Boot system into commissioning mode and run 'Check Machine Data' function from Service menu to identify corrupted or out-of-range values.

If recent restore was performed, re-load machine data from known good backup dated before the alarm occurrence.

Ensure backup is from compatible software version

If corruption persists, perform selective factory reset of affected machine data sections (MD134 and MD400 series only), then reconfigure manually.

This will delete custom configurations in these sections

Execute NCK reset (cycle power with key switch), verify system boots without alarm, and test basic axis movements.

Review MD134 and verify all assigned axis numbers correspond to physically configured axes in MD10000 (number of axes) and MD20070 (axis names).

Check MD20110 (number of channels) matches channel assignments in MD134. Ensure no orphaned channel references exist.

Verify drive configuration in MD1000-MD1020 matches axis assignments. Check that all referenced axes have valid drive parameters configured.

Correct any mismatched assignments, save machine data, perform NCK reset, and verify proper channel/axis operation in diagnostic screens.