8038

Access Siemens HMI menu: Diagnostics > Parameters > Machine Data. Navigate to MD $MA_AXCONF_ASSIGN_MASTER_NCU and count the number of axes assigned non-zero master axis references (values 1-31).

Check the active software option license via HMI: Diagnostics > System Information > Software Options. Locate the 'Lead Link Axes' or 'Synchronized Axes' option and verify the maximum permitted count (e.g., 'up to 4 lead link axes').

If configured count exceeds licensed limit, either reduce the number of axes assigned in MD $MA_AXCONF_ASSIGN_MASTER_NCU by setting excess axes to master value '0' (standalone), or upgrade the SINUMERIK software option license.

Do not arbitrarily change axis master assignments without verifying machine kinematics and control logic requirements.

After modification, perform a warm restart (Ctrl+Shift+Del or via HMI System > Restart) to reload machine data and re-validate the NCK configuration.

Backup current machine data by exporting MD parameters via HMI: Maintenance > Backup > Machine Data or use SINUMERIK Automation Tool (SAT) to export $NCMD.DEF and related configuration files.

Verify software option installation completeness: Access HMI System > System Information > Software and check version/build number matches the licensed option package documentation. If inconsistent, re-run the software installation or license update utility.

Reset MD $MA_AXCONF_ASSIGN_MASTER_NCU to factory defaults by setting all lead link axis entries to '0', then selectively re-enable only the required lead link axes within the licensed limit.

This action will reset all synchronization axis relationships; coordinate with machine design team before applying.

Execute a cold restart (power-off for 10 seconds minimum, then power-on) to force a full parameter re-initialization and NCK validation cycle.

Check NCU event log via HMI: Diagnostics > System Diagnostics > Event Log. Look for entries indicating 'Parameter Download Failure', 'EEPROM Error', or 'CRC Checksum Error' near the alarm timestamp.

Perform a parameter RAM test by navigating to HMI Maintenance > Diagnostics > Memory Test. Run the full machine data (MD) memory validation to detect persistent corruption.

If corruption is confirmed, restore machine data from a known-good backup file using SINUMERIK Automation Tool (SAT) or HMI Maintenance > Restore > Machine Data. Select a backup created before the last configuration change.

Ensure backup date predates the first occurrence of alarm 8038 and verify backup file integrity before restoration.

Re-download all machine data parameters via SAT or HMI upload/download utility with error checking enabled, then perform a warm restart to confirm resolution.