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Navigate to SYSTEM > PARAM and set parameter write enable switch (PWE) to 1. Access parameter display by pressing SYSTEM key, soft key PARAM.

Enabling parameter write requires proper authorization and key switch position may need to be at correct setting depending on machine builder configuration

Check parameter 3202 bits. Bit 0=1 protects O0000-O7999, Bit 1=1 protects O8000-O9999. Set appropriate bit to 0 to disable write protection for the program range you need to modify.

Check parameter 3201 (program number write protection). If set to a specific program number, that program is protected. Set to 0 to disable individual program protection.

After parameter changes, set PWE back to 0 and cycle power or reset the control for parameters to take effect.

Always return parameter write enable to OFF after completing parameter modifications

Remove the memory card or USB device from the control and check for physical write-protect switch on the device. Slide switch to unlocked position if present.

Power down control before removing memory cards to prevent file corruption

If using FANUC compact flash card, navigate to FILE > device selection and check file attributes. Use soft key ATTR or DETAIL to view read-only status of specific files.

To remove file-level protection, select the protected file and use FANUC file operation soft keys to change attributes from read-only to read-write if option is available.

Alternatively, connect memory card to PC, right-click file properties, and uncheck read-only attribute before reinserting into CNC control.

Check machine control panel key switch position. Verify key is in EDIT or higher authority position (not in RMT or other restricted mode) as required by machine builder configuration.

Navigate to SYSTEM > PARAM and check parameter 3210 (data protection level). Values 0-7 set protection levels. Setting requires PWE=1. Consult machine builder documentation for specific level requirements.

Parameter 3210 settings are machine-specific and may be password protected by OEM

Check parameter 3290 bit 6 (editing protection). If bit 6=1, program editing is prohibited. Set bit 6=0 with PWE enabled to allow editing operations.

Verify no EDIT LOCK signal (G signal) is active from PMC ladder. Check DIAGNOSIS > PMC > signal status for edit-related interlock signals that may be preventing write operations.