Fanuc Wn57 Override Function Is Active

Modern CNC machines rely heavily on Dual Check Safety (DCS) or standard safety PLCs.

On newer FANUC i-Series (Series 0i-F, 31i-B5), overrides can be triggered via soft keys:

An operator accidentally changed a PMC parameter or K-address while operating the machine.

Understanding the FANUC WN57 Override Function Active Message fanuc wn57 override function is active

Consult your specific machine tool builder manual (e.g., your ROBODRILL instruction manual) to locate the exact Keep Relay assigned to "Override Functions." Switch the control to , enable Parameter Write (

temporarily to verify program flow. Why It Needs to Be Deactivated

The physical dial on the operator panel is not set to 100%. Modern CNC machines rely heavily on Dual Check

Ensure the operator enclosure doors are completely closed and the door lock mechanism is fully engaged. Step 2: Inspect Software Toggles (Softkeys) Look for active software modes on the FANUC screen. Press the or Operator menu keys.

If you are actively proving out a new program or performing maintenance, you can safely ignore the WN57 warning. It is doing its job by reminding you that overrides are active. If Unintentional: Return all manual dials to

: Illegal Override Function Setting (too many PMC paths active). Why It Needs to Be Deactivated The physical

A: No. EMG is a hard stop (red alarm). WN57 is a soft warning (white/yellow message).

Press the (PMC Manager) or PMCDGN (PMC Diagnosis) softkey. Select STATUS continuous monitoring.

WN57 OVERRIDE FUNCTION IS ACTIVE message on a Fanuc CNC is a PMC (Programmable Machine Control) alarm indicating that the "Override" mode for the forced I/O function is currently enabled

Search for the override interface signals (typically mapped around system variables or specific G-signals like G0012 for feedrate overrides, or specific safety inputs determined by your builder's manual).

The message informs the operator that one or more manual override switches on the machine control panel (MCP) are currently active and modifying the programmed execution values. This function is often tied to safety protocols, setups, or specific machine states where standard programmed speeds are intentionally bypassed. Most frequently, this warning triggers when: The machine is running in a setup or maintenance mode.