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Access the HMI or Engineering Terminal and navigate to Diagnostics > File System or use MDI command DIR to list contents of the external drive (/external or /mnt/nandflash depending on SINUMERIK version).

Identify and delete obsolete or redundant NC programs. Use the file manager to remove backup copies, temporary files, or archived G-code. Target deletion of files >10MB if storage is constrained.

Do not delete active job programs or system files in /system/ or /param/ directories.

Verify free space now exceeds the threshold specified in MD 10820 (typically 5-10% of total external memory). Use DIR command to confirm available capacity.

Clear the alarm by pressing the RESET button on the control panel or issuing a soft reset via HMI. Re-attempt the job execution.

Navigate to Diagnostics > System Information and check the External Memory Usage percentage. If above 85%, proceed to cleanup.

Access the file system via HMI file manager and audit /external/subroutines and /external/macros directories. Archive or delete deprecated subroutine versions and unused macro libraries to a USB drive or network share.

Verify no active programs reference deleted subroutines before removal. Check program comments or use the Subroutine Browser in Siemens ShopMill/ShopTurn to identify dependencies.

Compress or consolidate tool tables and offset tables. Remove duplicate or inactive tool library entries via Diagnostics > Tool Management or direct file editing.

Perform a soft reboot (Home > System > Restart NCK) to refresh the file system cache and update the memory usage display. Confirm alarm clears.

Access System > Machine Parameters (MD) in the Siemens HMI and navigate to MD 10820. Note the current External Memory Limit value (typically in KB or MB units).

Compare MD 10820 value against the actual external drive capacity visible in Diagnostics > System Information. If the limit is set to <50% of physical capacity, it may be undersized. Consult machine documentation to confirm the intended limit for your SINUMERIK model.

Changing MD parameters requires engineering mode access and may require NCK restart.

If fragmentation is suspected, perform a file system check via Diagnostics > File System Maintenance > Check and Repair or execute fsck command on the external partition (if accessible via service terminal).

File system repair may require downtime and data backup. Contact Siemens Service if uncertain.

After verification, increment MD 10820 to a more conservative threshold (e.g., from 90MB to 120MB) if physically justified, save parameters, and restart the NCK. Confirm alarm no longer triggers on routine job loads.