PS0073

Navigate to SYSTEM > PROGRAM > directory screen and press [OPRT] soft key, then [DIR] to display total program count at bottom of screen showing 'USED/TOTAL' programs.

Check parameter 3107 via SYSTEM > PARAM > [ALL] soft key, search parameter 3107 to verify maximum program number setting (typical range 1-9999 depending on control series).

Delete unused programs from memory using EDIT mode: select programs in directory, press [DELETE] soft key, then [EXEC] to free program slots. Verify program count reduces below parameter 3107 limit.

Ensure programs are backed up to external device before deletion. Critical production programs must not be deleted without authorization.

If legitimate need for more programs exists, increase parameter 3107 value after setting parameter write enable (parameter 0000 bit 0 = 1), then power cycle the control to activate new setting.

Increasing parameter 3107 beyond system memory capacity may cause memory allocation errors. Consult machine tool builder specifications for maximum supported program count.

Check memory usage via SYSTEM > DIAGNOSIS > [PARAM] soft key > enter diagnostic number 0300 (displays total memory) and 0301 (displays used memory). Calculate available memory percentage.

Identify large programs consuming excessive memory by reviewing program directory with file sizes displayed. Sort by size using [OPRT] > [SORT] soft keys to locate largest programs.

Delete obsolete or infrequently used large programs, or transfer them to external storage device (USB, CF card, or network server). Use DNC operation for large programs instead of storing in CNC memory.

Verify backup integrity before deleting programs. Test DNC communication if switching to external program execution.

If memory expansion is available, contact Fanuc service to install additional DRAM module or upgrade FROM/FlashROM memory card (check control specification sheet for upgrade options specific to 0i/16i/18i/30i/31i/32i series).

Memory upgrades require Fanuc-authorized parts and may necessitate parameter backup/restore and system reinitialization.

Check battery voltage via SYSTEM > DIAGNOSIS > diagnostic number 0003 (should read 3.0-3.6VDC for absolute encoder battery) and diagnostic 0002 (backup battery status, 0=OK, 1=Low). Replace battery if voltage below 2.8V.

Battery replacement requires parameter backup to external device first. Control may lose all programs and parameters if battery completely fails during replacement.

Verify memory allocation parameters: check parameter 3107 (max program number), 3106 (program number range), and 3108 (subprogram number range) for consistency. Cross-reference with machine tool builder parameter documentation.

Execute program memory initialization via SYSTEM > MAINTENANCE screen (password protected) > [ALL DELETE] function to clear corrupted registration table. This deletes ALL programs and resets program directory structure.

This operation permanently erases ALL programs in memory. Mandatory full backup required before proceeding. Machine tool builder authorization typically required for maintenance screen access.

If alarm persists after memory initialization, perform total CNC parameter clear and reload from verified backup. Check for SRAM hardware errors via diagnostic screens 0200-0299 series (memory error flags). Replace CNC main board if hardware memory fault detected.

Total parameter clear requires machine geometric re-compensation and full operational checkout. Contact Fanuc service if main board replacement necessary - control serial number transfer required.