Debugging and testing the sequence program during machine setup or intensive maintenance.
Because WN57 is an "active" status rather than a failure, it can usually be resolved by toggling the function off through the CNC’s internal settings or by modifying a specific Keep Relay ( -address). Method 1: Using the PMC Parameter Screen Navigate to the on your FANUC controller. Select [PMC SET] or [PMC PARAM] . Look for the Setting or Override sub-menu. fanuc wn57 override function is active
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. Debugging and testing the sequence program during machine
Note: If K906.0 is already 0 and the message persists, check your machine builder's manual as they may have mapped the debug override to a different K-address. Why Did This Message Appear? Select [PMC SET] or [PMC PARAM]
FANUC documentation explicitly states that this function should be disabled before shipment or returning the machine to regular production. Leaving it active can lead to unexpected machine behavior because the ladder logic may not be executing under its original designed constraints. How to Disable the WN57 Warning
Understanding the FANUC WN57 Override Function Is Active Message