6581

Access NCK file system via HMI menu: Diagnostics > File Management > NC Programs. Document total size of stored .mpf and .spf files.

Delete obsolete or test part programs from the user memory partition. Use HMI delete function or command DEL <filename> in MDI mode.

Verify programs are backed up externally before deletion. Deleting active or required programs will halt production.

Check MD20070 (MemoryUserProgram) via Diagnostics > System Information > Memory Configuration. Compare allocated memory against current program storage needs.

If storage requirements have grown legitimately, increase MD20070 allocation (if system DRAM permits) and reboot the NCK via Power > System Reset.

Increasing MD20070 reduces memory available for other NCK functions. Consult machine documentation for maximum safe allocation.

In Diagnostics > File Management, navigate to Subroutines folder and review .spf file sizes. Look for redundant or legacy subroutine versions that can be consolidated.

Audit active part programs for unnecessary local variable declarations or large array definitions that persist in memory. Use Program Manager to analyze variable usage.

Delete duplicate or superseded subroutines. Consolidate subroutine logic where multiple versions exist for similar operations.

Verify no active programs reference deleted subroutines before removal to prevent runtime errors.

If subroutine library is essential and cannot be reduced, request engineering review of MD20070 allocation and available DRAM margin on the 840D controller.

Check Diagnostics > System Alarms > Alarm History for prior file system errors (alarms 6500-series range). Note any power-loss events or unexpected controller resets.

Perform a controlled NCK warm restart: Power > System Reset (warm boot). This triggers file system check but does not erase programs. Monitor for file system repair messages in the alarm log.

Warm restart will clear active program execution and any unsaved offsets or work coordinate systems.

If alarm 6581 persists after warm restart, export all critical programs to external storage, then perform cold restart (power cycle with NCK system reset enabled).

Cold restart performs full file system check and rebuild. This is disruptive; schedule during maintenance window.

If alarm recurs immediately after cold restart, escalate to Siemens Field Service for NCK DRAM diagnostics or possible MD20070 adjustment based on NVRAM analysis.