Fanuc Wn57 Override Function Is Active

Disclaimer: Machine parameters and PMC messages vary significantly between machine manufacturers and FANUC control models. Always consult your specific machine tool builder’s manual for accurate diagnostic information. If you'd like, I can help you:

Set a default program header to force overrides to 100% at start:

If WN57 is active because a safety interlock sensor is failing or bypassed, it poses a risk to operators who expect the machine to behave under standard safety boundaries. fanuc wn57 override function is active

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.

To clear this message and return the machine to standard operation, you must turn off the override function: Via PMC Parameters Navigate to the PMC Setting screen on your FANUC control. Find the option for Override Effective Set this value to Restart the CNC to clear the alarm. Via Keep Relay (K-Address) Directly change the keep relay If the message persists, it means the PMC

FANUC systems can use digital input signals to control speed selection during automatic operation.

The override function is a developer's tool for debugging and testing the machine's ladder logic. Ladder logic (the PMC's program) consists of conditional statements based on input signals (like from limit switches) that determine output signals (like starting a motor). This tool allows programmers to temporarily bypass real-world inputs and set a signal to "1" (ON) or "0" (OFF) to test how the program responds. This is crucial for simulating faults without physically triggering a sensor. Find the option for Override Effective Set this

In FANUC systems, the PMC Override function allows a technician or programmer to manually force specific signals (inputs or outputs) to a desired state, regardless of the actual logic or physical sensor status.

Ensure that no manual feed functions, such as MPG (Manual Pulse Generator) pacing or jog feed functions, are actively modifying the automatic cycle. 4. Check PMC Parameters and G-Signals