Fanuc Wn57 Override Function Is Active < 2026 >

This message—"WN57 OVERRIDE FUNCTION IS ACTIVE"—appears on FANUC CNC controls (often on series like 0i, 30i, 31i, 32i, or 21i) when the control is operating in a special override mode that bypasses certain safety or standard operating limits.

WN57 OVERRIDE FUNCTION IS ACTIVE message on a FANUC control indicates that the PMC Override (forced I/O) function is currently enabled fanuc wn57 override function is active

Data Corruption: In rare cases, a loss of CMOS memory or a failing backup battery can cause parameters and keep relays to scramble, potentially "flipping" the bit for the override function. This function is primarily used as a debugging

The Fanuc message "WN57 OVERRIDE FUNCTION IS ACTIVE" is a PMC (Programmable Machine Control) status message indicating that the machine's signal override feature is currently enabled. This function is primarily used as a debugging tool Final recommendation | Your goal | What to

may have been utilized to disable or set overrides programmatically. What to Do If Unintended Check Diagnostics: DIAGNOSTICS screen and look at status for (W-address 57) to determine if it is (Active) or (Inactive). Toggle Switch/Menu: Use the custom operator panel or softkey to disable the specific override function.

Final recommendation

| Your goal | What to do | |-----------|-------------| | Just remove WN57 | Set rapid/feed override to 100%, dry run OFF, press RESET | | Run with override <100% | Ignore the warning if machine allows | | Machine refuses to run | Call machine tool builder – they set the logic | | You want to disable it | Check PMC ladder or FANUC parameter 3001#5 (OVW) |