These relate to sequence program storage and flash ROM issues, distinct from the override function alarm.
When any of these functions are in an "active" state, the CNC is technically not in pure Memory or MDI operation. The WN57 warning appears when you attempt to change modes (e.g., from EDIT to MEM) or start a program while one of these overrides is still engaged.
When a signal is overridden, it is visually distinct from a signal that is simply ON due to a physical input (like a pressed button). On the PMC signal status screen, overridden signals are indicated by a ">" symbol placed before the address. fanuc wn57 override function is active
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Ensure all safety doors are fully closed and the interlock keys are properly seated in their switches. These relate to sequence program storage and flash
The WN57 alarm (or status message) on a FANUC CNC control indicates that an override function is currently enabled – typically a rapid traverse override , feed rate override , or a dry run override . Unlike many alarms, WN57 is generally an informational message , not a critical error. The machine will continue to run, but with altered motion parameters.
While you can often still run a program with WN57 active, ignoring it is not recommended for production environments: When a signal is overridden, it is visually
To find the exact cause, you must look at what the PLC is telling the CNC. Press the key on the FANUC MDI panel. Press the PMC softkey, then select STATUS or SIGNAL .