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Switch the control to SERVICE mode and access the machine data configuration menu.

Ensure you have appropriate authorization level and backup current machine data before making changes.

Navigate to channel-specific machine data and check MD20900 $MC_REPOS_MODE_MASK for the affected channel. Verify its current value.

Set MD20900 $MC_REPOS_MODE_MASK to the appropriate value to enable Auto-Repos (typically Bit 0 = 1 for basic repositioning functionality). Consult machine manufacturer documentation for correct bit settings.

Incorrect settings may affect machine behavior. Coordinate with machine builder if uncertain.

Perform a power-on reset (NEWCONFIG) to activate the machine data changes, then test the Auto-Repos function.

NEWCONFIG will restart the control system. Ensure no production operations are active.

Check the current user login and protection level on the HMI. Verify which user account is currently active.

Log in with a user account that has appropriate privileges (typically manufacturer, service, or key switch position 3).

Do not share high-level passwords with unauthorized personnel.

Check MD9220 $MM_WRITE_ENABLE_MASK to verify which protection levels have access to repositioning functions.

Attempt the Auto-Repos function again with elevated privileges. If successful, document the required access level for operator training.

Review the NC program at the line where the alarm occurs. Verify the correct syntax for invoking Auto-Repos (typically through specific cycles or G-codes per manufacturer implementation).

Check if standard cycles related to repositioning are present in the system directory (typically /user/sinumerik/cma/cycle or similar path).

Verify that the REPOS command or cycle is being called in the correct operating mode. Some implementations require AUTO mode or specific machine states.

If cycle files are missing or corrupted, restore them from backup or reinstall the standard cycle package for your SINUMERIK version.

Ensure version compatibility between control software and cycle files. Use only Siemens-approved or machine builder-supplied cycles.