Fanuc Wn57 Override Function Is Active Jun 2026

The FANUC WN57 "OVERRIDE FUNCTION IS ACTIVE" alarm serves as an important reminder that a powerful debugging tool has been left in an active state. While the override function is invaluable during ladder program development and debugging, it must be disabled for normal production operation.

Look up the feedrate override signals ( for bits *OV0 to *OV7 ). A broken wire or failed rotary switch contact can send a continuous override signal to the control, even if the physical knob points to 100%. Summary for Operators

Ensure the machine is physically configured for automatic production.

Understanding the "FANUC WN57 Override Function is Active" Alert: Causes, Impacts, and Solutions fanuc wn57 override function is active

Find the [PMC Parameter] or [PMC Config] screen.

Do not operate the machine while the WN57 alarm is active, as the override function may cause unexpected machine behavior.

If you have forced a tool changer to a "clamp" position while it is actually un-clamped, the machine may crash. The FANUC WN57 "OVERRIDE FUNCTION IS ACTIVE" alarm

This method provides a direct approach for those familiar with FANUC's keep relay system.

The message typically appears when the system detects that the or a related custom PMC (Programmable Machine Control) function has been engaged.

Check the system variable $GENOV_ENB . If this is set to , manual override might be ignored in certain modes. A broken wire or failed rotary switch contact

Locate the and Rapid Traverse dials on your operator interface. Turn both dials exactly to the 100% position.

To remove the WN57 warning, you must disable the override function in the PMC parameter settings. Here are the common methods, ordered from simplest to most technical. Method 1: Changing the PMC Parameter Screen (Recommended) Go to the or PMC screen on your Fanuc controller. Navigate to the PMCPRM (PMC Parameter) screen. Find the option for "Override" or "Force".