Fanuc Wn57 Override Function Is Active Review

If this message appears during normal cutting and you cannot clear it, refer to your machine tool builder's manual, as they are responsible for the specific PLC logic that triggers this, or search for the alarm code in official Fanuc manuals.

However, WN57 is typically a built-in safety feature for FANUC Series 0i, 16i, 18i, 21i, and 31i controls.

The message is a protective tool provided by your machine builder to tell you that the machine is currently operating under special, programmed conditions. It is commonly linked to probe cycles, tool changes, or rigid tapping overrides.

After performing a (mid-program start), the operator may not complete the "distance-to-go" cancellation. The controller remains in an “Override” state (a type of position deviation allowance) until the cycle start is pressed again. Attempting to edit or reset the sequence prematurely triggers WN57. fanuc wn57 override function is active

According to official FANUC documentation, the WN57 alarm message appears with the following description: "The Override function is for debugging only. So, please disable the function when shipping the machine". This official statement clearly indicates that while the override function serves a valuable purpose during development, it should never remain active during normal production operations.

In these cases → the warning.

Check the physical control panel of the machine. Turn both the feedrate override dial and the spindle speed override dial exactly to the position. On many FANUC panels, this aligns the dials to the top-vertical position. 2. Deactivate Dry Run Mode If this message appears during normal cutting and

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

If you performed a block search:

WN57 is a warning rather than a critical system fault. It informs the operator that the machine logic is not running in its standard state because at least one signal is being artificially held or "overridden." Why It Stays Active It is commonly linked to probe cycles, tool

Check your override knobs. Set them all to 100%. The machine will then proceed.

Verify that or Optional Block Skip (BDT) are not unintentionally conflicting with your current operation mode. Step 3: Inspect Safety Key-Switches

FANUC alarms are categorized by prefixes:

Find the override function or override enable setting in the PMC parameters.

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