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Press SYSTEM > PROGRAM key and check total memory usage. On older controls (0i/16i/18i), check the top of screen for 'USED: XXXX / TOTAL: XXXX' display. On newer controls (30i/31i/32i), press SYSTEM > CURRENT, then check memory usage percentage.

Delete unnecessary programs via MDI mode. Select unwanted programs using cursor, press DELETE key, then confirm deletion. Prioritize deleting large programs or test programs no longer needed.

Always backup programs to external device (CF card, USB, or network) before deletion to prevent permanent data loss.

If program memory parameter is user-adjustable (model-dependent), check Parameter 3107 (total program storage capacity) and Parameter 3108 (number of programs). These are typically read-only on newer controls but may be adjustable on 0i/16i series with memory expansion cards installed.

Consider transferring programs to external storage or enabling DNC (Direct Numerical Control) operation via Parameter 020 bit 0 (TAPE mode) to run programs directly from external device without loading into memory.

Check the size of the program attempting to register. If transferring via RS-232 or network, note the file size. Compare against available memory shown in SYSTEM > PROGRAM screen. A single program cannot exceed remaining free memory.

Review Parameter 3107 for maximum program storage and Parameter 3106 for maximum edit length (characters per program). On 30i/31i/32i series, typical default is 2-4MB total depending on configuration. Verify program size is within these limits.

If program contains extensive comments, consider removing non-essential comment lines using parentheses ( ) or semicolon format. Comments consume memory but are not required for program execution.

Split large programs into multiple smaller programs using subprogram calls (M98 P####). This distributes memory usage and allows modular program management. Main program calls subprograms sequentially as needed.

Perform ALL DELETE operation to clear all programs from memory. Press SYSTEM > PROGRAM, then OPRT key > DELETE ALL > EXEC. This clears memory allocation tables and reinitializes program storage area.

This deletes ALL programs permanently. Backup all programs to CF card, USB, or external device before executing. Verify backups are complete and readable.

If ALL DELETE does not resolve issue, perform CNC parameter initialization. Set Parameter 0000 bit 6 (PCL) = 1 to clear all programs and macro variables, then power cycle the control. After reboot, restore parameters from backup.

Setting Parameter 0000 bit 6 requires parameter write enable (PWE bit 1 = 1) and will clear ALL programs, offsets, and macro variables. Complete system backup is mandatory before this operation.

Check DIAGNOSIS screen for memory errors. Navigate to SYSTEM > DIAGNOSIS > search for diagnostic numbers 700-799 range (memory-related diagnostics vary by control series). Note any non-zero error counts indicating memory hardware issues.

If memory errors persist after initialization, contact Fanuc service for memory module diagnostics. Hardware failure of FROM/SRAM modules (0i/16i/18i series) or CF card corruption (30i/31i/32i series) may require component replacement by qualified service personnel.