PS070

Press SYSTEM > PROG > directory list to view all registered programs. Check total number of programs and individual file sizes. Press [OPRT] softkey then [MEMORY] to view total memory usage.

Navigate to SYSTEM > DIAGNOSIS > D900 (used memory size) and D901 (free memory size) to verify available capacity in bytes. If D901 shows less than 10KB, immediate deletion is required.

Delete unused programs via EDIT mode. Select program by O-number, press [OPRT] softkey, then [DELETE] then [ALL PROG] for multiple files. Alternatively, use O-9000 to O-9999 range cleanup for temporary programs.

Ensure backup of all critical programs to external device (CF card, USB, or network) before deletion. Verify with production personnel which programs are obsolete.

After deletion, perform memory defragmentation if available. On 30i/31i/32i series, execute SYSTEM > PMC > [MAINT] > [MEM DEFRAG] or power cycle the CNC to consolidate free memory blocks.

Check DIAGNOSIS > D901 (free memory) and compare to size of program being loaded. If free memory exceeds program size but PS070 still occurs, fragmentation is likely. D902 shows largest contiguous block available.

Backup all programs to external media via RS-232 (parameters 20-23 for baud/stop bits), Ethernet, or USB/CF card using TAPE mode > [PUNCH] operation with [ALL PROGRAM] selection.

Verify backup integrity by checking file size and performing test restore to separate folder before proceeding with deletion.

Delete ALL programs from CNC memory using EDIT mode > [OPRT] > [DELETE] > [ALL PROG] > confirm execution. This clears fragmentation completely.

Machine will be non-operational until programs are restored. Coordinate with production management.

Restore programs from backup using TAPE mode > [READ] operation. Programs will now occupy contiguous memory blocks. Verify by checking D902 diagnostic for largest free block size.

Check SYSTEM > PARAM > parameter 3107 (total memory capacity in KB). Compare to system specifications for your control model. For 0i-F typical is 512KB-1MB, 30i/31i is 2-4MB. If value is unusually low, parameter corruption is possible.

Verify SRAM battery status at DIAGNOSIS > D9000 (battery voltage, typically >3.0V indicates good). Check for alarm BAT-101 in alarm history. Low battery can cause memory accessibility issues.

Check control PCB (main board) for memory expansion options. On 0i-MF/30i systems, verify if compact flash (CF) card or FROM memory module is properly seated. Reseat CF card if present.

Power OFF CNC completely before reseating any memory modules or CF cards. Follow proper ESD precautions.

If hardware failure suspected, contact Fanuc service with control serial number and DIAGNOSIS > D900/D901/D902 values. Memory expansion or SRAM module replacement may be required.