If you're interested, I can provide tips on how to properly set up your Fanuc maintenance schedule to avoid similar, unrelated errors in the future.
An operator accidentally changed a PMC parameter or K-address while operating the machine.
If the message persists, it means the PMC still thinks a condition is being overridden. A maintenance technician may need to look at the CNC diagnostic screens (PMC -> PMCDGN -> STATUS) to identify which input is forcing the override, often listed under specific diagnostic addresses.
Did this warning appear or during setup ? Are the physical knobs currently set to 100% ? fanuc wn57 override function is active
Verify that or Z-Axis Neglect modes are turned off. Step 3: Inspect PMC Parameters and System Variables
The message on a Fanuc control typically indicates that the machine's feedrate or speed override is being controlled by an external source or a specific internal safety setting, rather than the manual dial on the operator panel. Why This Message Appears
for PMC paths is active. This state is often left on accidentally after troubleshooting or machine setup. While active, the system may prevent the ladder program from executing correctly or may result in an If you're interested, I can provide tips on
This function allows maintenance technicians or machine tool builders to "force" PMC signals (inputs/outputs) to a specific state, overriding their actual physical input. This is used for debugging and testing the ladder program.
The "Override Function" mentioned in this message refers to a specialized tool used by machine tool builders and maintenance technicians to debug the . When this function is active, it allows for the "forced" manipulation of PMC signals—effectively overriding the standard logic of the machine's ladder to test specific behaviors or troubleshoot faulty sensors.
The WN57 code is a warning (indicated by the "WN" prefix) rather than a hard alarm (often prefixed by "AL"). It signals that an override function on the CNC operator panel or within the software parameters is currently modified from its standard 100% baseline. A maintenance technician may need to look at
Go to (Diagnostics) and view the status of the override input bits (typically mapped to G000 to G012 signals depending on the machine tool builder's ladder logic).
If a manual intervention occurs mid-cycle—such as pausing execution via Feed Hold or switching the machine into Single Block mode while an override parameter is processing in the background—the ladder logic may flag the state as WN57 until the cycle resumes normally. Step-by-Step Troubleshooting and Resolution
If you need to know which specific K-address applies to your machine's particular builder (e.g., Fanuc Robodrill, Doosan, Haas), you should consult the operator's manual.