Fanuc Wn57 Override Function Is Active 【ESSENTIAL ⚡】

Watch for bits that change state when you toggle your physical setup switches. Look for any bits that remain high (1) when they should be low (0). Step 4: Reset System Variables via MDI

In the FANUC control ecosystem, codes prefixed with a "WN" indicate rather than "AL" (Alarms).

In simple terms, Common Causes for the WN57 Override

Some high-end FANUC models (31i-A, 31i-B) feature – a mode allowing the operator to manually jog an axis during an automatic cycle using the MPG (handwheel). If the operator exits this mode without canceling the interrupt or if the program expects synchronized axes, WN57 appears as a safety warning. fanuc wn57 override function is active

Look for highlighted softkeys such as , M.S.K. (Machine Lock) , or Z-Axis Neglect .

: It indicates that an override setting—such as Feedrate Override, Spindle Override, or Rapid Traverse Override—is currently engaged or forced.

Alternatively, check if variable #3004 (which controls feedrate, exact stop, and pause overrides) has been set to a value other than 0 . If it is locked, executing #3004=0 in MDI mode will instantly restore normal override control. Impact on Production If Ignored Watch for bits that change state when you

Check the status LEDs or softkeys for . If illuminated, toggle it off.

“WN57 means my FANUC control has corrupted software.”

The message is a PMC (Programmable Machine Control) alarm commonly found on FANUC CNC systems. Unlike standard system alarms that indicate hardware failures, this message signifies that a specific PMC debugging tool—the Override Function —has been enabled . In simple terms, Common Causes for the WN57

为了降低WN57报警等类似问题发生的频率，可以建立以下预防措施：

On certain machine tool builder (MTB) configurations, leaving the "Dry Run" switch active, or keeping the Feedrate/Rapid Override dials set to specific diagnostic zones (like a forced 0% or a specialized hardware test position), will throw the WN57 warning. This alerts the operator that the machine will not execute the program at its true coded velocities. 4. PMC Ladder Logic and Macro Variables

At the end of all your test programs, include:

The Machine Tool Builder writes custom PLC/PMC ladder logic to control physical buttons, coolant systems, and safety doors. If a specific system macro variable (such as system variables managing feedrate overrides like #3004 ) has been modified via a custom program or a probing cycle, the control triggers WN57 until that variable is reset to its default state. Step-by-Step Troubleshooting Guide

The operator has activated a maintenance mode that overrides door switches, forcing a standard safety speed limit. Common Causes of the WN57 Warning 1. Physical Override Dials Set Below 100%