Fanuc Wn57 Override Function Is Active

The "WN57 Override Function is Active" message on a Fanuc CNC typically refers to a specific condition within the PMC (Programmable Machine Control) ladder logic. This message is generally not an error code from the Fanuc system itself, but a custom operator message or warning defined by the Machine Tool Builder (MTB). Core Meaning

• Scenario: Running a new program for the first time.
• Action: Operator sets feed override to 50% to reduce cutting feed.
• Result: Program executes at half the programmed feed; message indicates override active until returned to 100%.

1. Operator checks physical panel – Dry Run switch is still ON (Orange LED).
2. Operator turns Dry Run OFF.
3. Operator presses RESET.
4. WN57 remains on screen.
5. Operator presses CYCLE START again (even though alarm is visible).
6. The machine clears the alarm and starts moving.

The WN57 override function is a software feature that enables the operator to modify the feed rate or spindle speed of a CNC machine during operation. This function is often used to adapt to changing machining conditions, such as tool wear, material hardness variations, or to optimize the cutting process. fanuc wn57 override function is active