To clear this message and return the machine to standard operation, you must turn off the override function: Via PMC Parameters Navigate to the PMC Setting screen on your FANUC control. Find the option for Override Effective Set this value to Restart the CNC to clear the alarm. Via Keep Relay (K-Address) Directly change the keep relay
The selector switch is set below or above 100%.
During setups, operators frequently clamp the Rapid Traverse (G00) speeds down to 25%, 5%, or a low F0 rate to prevent catastrophic crashes. If the machine enters automatic cycle with these restrictions active, WN57 alerts you that production times will be significantly extended. 4. PLC/PMC Hardcoded Override Functions
Toggle these functions off if they were accidentally left on. Step 3: Monitor Diagnostic and PMC Signals
This is often a rather than a hard error. It usually triggers in the following scenarios: fanuc wn57 override function is active
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Check if manual test modes are active. Turn off the switch or softkey. If you bypassed the door interlocks using a setup key switch, turn the key back to the locked automatic mode and close the machine doors. Step 3: Verify CNC Parameters and Signals
The alarm appears in the PMC alarm section of your FANUC control system, distinguishing it from CNC alarms, servo alarms, or spindle alarms.
The machine will typically continue to run the program. To clear this message and return the machine
Because WN57 is deeply integrated with the machine builder's logic, you can use the FANUC PMC status screen to find the exact culprit: Press the hard key on the FANUC panel.
The FANUC WN57 alarm is not a cause for immediate panic but a sign that the machine is currently in a special engineering state not intended for production. Understanding this alarm, its purpose, and how to resolve it provides valuable insight into the interaction between your FANUC CNC and its internal logic control.
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If this message appeared suddenly after a crash or battery change, it may be related to a Safety PLC forcing a "slow mode" until a safety fault is cleared or the home position is re-established. During setups, operators frequently clamp the Rapid Traverse
This occurs if you changed the wrong bit. Double-check that you modified (the first bit of K0906). If you changed K0906.1 , K0906.2 , etc., it will have no effect.
Software functions used for program verification can trigger override statuses.
In some machine tool builder (MTB) configurations, specific conditions within the logic (such as robotic loading doors being open, bar feeder reloads, or safety interlocks engaged) automatically force a feed or rapid override via software G-signals (like G012 for feedrate override). Impact on CNC Operations
To prevent the WN57 alarm from interrupting production: