Fanuc Wn57 Override Function Is Active Free May 2026

The WN57 OVERRIDE FUNCTION IS ACTIVE message is a specific PMC (Programmable Machine Control) alarm found on FANUC CNC systems . It indicates that the Override Function—a debugging tool used to manually force PMC signals—is currently enabled .

Final verdict:
A useful safety reminder, not a problem. Treat it as a “heads-up” that the machine is not running exactly as programmed. Always check it before running production. fanuc wn57 override function is active

For the operator, this message can be misleading. Attempting to adjust the override dial on the control panel will typically have no effect, as the restriction is software-enforced, not user-controlled. This distinction highlights the importance of distinguishing between a "user override" and a "system override." The latter implies a fault condition that must be cleared before normal manual control is restored. The WN57 OVERRIDE FUNCTION IS ACTIVE message is

The WN57 alarm appears when the PMC Override feature is active. This tool is primarily used by developers or maintenance technicians during the debugging process to: Scenario: Surface finish improves with a slight spindle

The message "WN57 Override Function is Active" 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

• Scenario: Surface finish improves with a slight spindle increase.
• Action: Operator increases spindle override to 110%.
• Result: Spindle runs 10% faster than programmed; monitor tool load and workpiece response.