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Access Siemens HMI menu: Diagnosis → Memory Management → SRAM Usage. Verify current buffer utilization percentage and compare against MD20100 (Memory allocation mode) setting.

Do not modify memory parameters while NC program is running.

Check active NC program for excessive block count using Program → List Program → Block Counter. Programs exceeding 50,000 blocks with multi-axis interpolation are primary candidates. Consider splitting into subprograms or reducing interpolation resolution.

Verify MD20101 (Buffer Memory Size) allocation. If set below 4 MB, increase to 6-8 MB range via Siemens Service menu → Parameters → Machine Data, cycle number 20101. Requires control system restart.

Increasing SRAM allocation reduces memory available for other NCK functions.

Clear expired cc_resu.mpf residual files: Access NCK file system via Service → File System → /memory/cc_resu.mpf. Delete outdated entries to reclaim SRAM space.

Review NC program G-code for G00 rapid sequences with all axes moving simultaneously. Each axis motion increment generates separate return travel data entries. Use Program → Analyze → Motion Density report.

Check MD20110 interpolation resolution setting (typical range 0.001-0.1 mm). If set to very fine resolution (< 0.01 mm), reduce to 0.05 mm or coarser where tolerance permits to reduce interpolation block count.

Reducing interpolation resolution may affect surface finish quality on contoured surfaces.

Optimize rapid traverse sequences: Replace simultaneous multi-axis G00 commands with sequential movements where possible. Use Trace → Path Simulation to visualize trajectory density before execution.

Access Service Menu → Diagnostics → Memory Check. Run full SRAM integrity scan (typically 2-5 minutes). If errors detected, proceed to step 2.

SRAM check requires control to be in Idle state with no active programs.

Delete and rebuild cc_resu.mpf: Service → File Management → Delete /memory/cc_resu.mpf, then power-cycle control. NCK will reinitialize file structure on restart.

All stored return travel resumption points will be lost. Running programs cannot be resumed after deletion.

If alarm recurs after file deletion, perform SRAM defragmentation via Service → System → Maintenance → Defragment Buffer Memory. This reorganizes file system FAT table.