If all physical dials are set to 100% and the warning persists, the issue is likely a software-forced override from the PLC. Press the key on the FANUC MDI panel.
It is usually a , not an alarm.
When the WN57 alarm is active, you will typically see the following displayed on your FANUC CNC control screen:
When a signal is overridden, it is visually distinct from a signal that is simply ON due to a physical input (like a pressed button). On the PMC signal status screen, overridden signals are indicated by a ">" symbol placed before the address. fanuc wn57 override function is active
WN57 permanently (not recommended)
在PLC程序开发或维护中，工程师需要对逻辑进行验证和故障排查。为了能某些输入信号的状态（例如无视物理传感器信号，强制其导通或断开），FANUC在PMC中提供了一个专门用于调试的功能，即Override（倍率/覆盖调试功能）。
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 If all physical dials are set to 100%
This message——appears on FANUC CNC controls (often on series like 0i, 30i, 31i, 32i, or 21i) when the control is operating in a special override mode that bypasses certain safety or standard operating limits.
Debugging and testing the sequence program during machine setup or intensive maintenance.
If the WN57 message appeared suddenly without manual intervention, it may indicate one of the following scenarios: When the WN57 alarm is active, you will
The selector switch is set below or above 100%.
When engineers or maintenance personnel are using the override function to test and debug the PMC ladder program, the override function is temporarily enabled, triggering the WN57 alarm.
