PS0070

Check current memory usage: Press SYSTEM > PMC > [TITLE] softkey, then navigate to SYSTEM > DIAGNOSIS > select PROGRAM MEMORY screen (display #2 on many controls) to view total memory, used memory, and free memory in bytes or KB.

List all registered programs: Go to EDIT mode, press PRGRM key, then press [DIR LIST] or [O SRCH] softkey to display all program numbers and their individual file sizes. Note largest programs consuming memory.

Delete unused or obsolete programs: Select programs to delete using cursor, press [DELETE] softkey followed by [EXEC]. Alternatively, delete program by entering 'O____' (program number) then press DELETE and [EXEC]. Verify memory freed by rechecking DIAGNOSIS screen.

Ensure programs are backed up to external media before deletion. Critical production programs must not be deleted without operator/engineer authorization.

Consolidate or optimize programs: Combine similar programs using subprograms (M98/M99) to reduce redundant code. Remove excessive comments and blank spaces. Transfer archived programs to CF card, USB, or network storage for external backup.

Check memory configuration parameters: Press SYSTEM > PARAM, set parameter write enable (parameter 3202#0=1 or parameter enable switch ON), then review parameter 3107 (program memory expansion), parameter 3108 (auxiliary memory), and parameter 3112 (total memory setting). Note current values.

Parameter changes require CNC power cycle to take effect. Incorrect settings may cause data loss or system instability.

Verify macro variable memory allocation: Check parameters 6000-6009 (custom macro common variable range). Excessive macro variable memory allocation reduces program storage. Consider reducing if not fully utilized by adjusting parameter 6001.

Review PMC ladder memory settings: Navigate to SYSTEM > PMC > [PARAM] and check PMC parameter memory allocation. Oversized PMC program or excessive symbol data may consume shared memory resources. Optimize PMC if necessary.

If memory expansion option (FROM-Ei or Flash ROM) is installed but not enabled, set parameter 3107#0=1 to activate expanded memory. Power cycle CNC after parameter change and verify increased memory via DIAGNOSIS screen.

Confirm hardware memory expansion option is physically installed before changing parameter 3107. Enabling without hardware will cause boot errors.

Perform memory formatting: Backup all programs to CF card or USB. Navigate to SYSTEM > [FSSB/MAINT] > select 'FORMAT PROGRAM MEMORY' or use MDI command 'FORMAT' (control-dependent). This reinitializes the file allocation table and clears corruption.

FORMATTING ERASES ALL PROGRAMS PERMANENTLY. Complete verified backup is mandatory. Ensure battery voltage is adequate (check DIAGNOSIS screen #0200, bit 1 for low battery alarm). Do not power off during format.

Check for hardware memory errors: Review DIAGNOSIS screen #0900-0999 for memory diagnostic error codes. LED on CPU board may indicate memory faults (steady red or error pattern). If hardware errors present, replace CPU board or memory module.

Restore programs from backup: After successful format, restore programs individually or via batch transfer. Monitor memory usage during restoration to identify if specific program causes memory allocation failure.

If alarm persists after format with minimal programs loaded, escalate to Fanuc service: Likely hardware failure of flash ROM or SRAM requiring main board replacement. Document all diagnostic findings and parameter settings before service call.