"The WN57 alarm is a serious machine fault requiring immediate service."
The warning is a built-in protective mechanism. It tells you that a background safety condition, automation handshake, or manual dial is forcing the machine to run under constrained parameters. By systematically checking your physical safety keys, closing automation loops, and verifying macro variables, you can quickly clear the warning and get your machine back to peak production efficiency.
FANUC系统的PMC是内置于CNC中的PLC，通过梯形图程序执行机床的各类辅助功能，如控制冷却液开关、刀库换刀、工件夹紧等。梯形图的逻辑正确性直接影响机床的稳定运行。
The phrase means the CNC machine is running under modified speed or safety parameters. An override switch on the operator panel has been turned away from its standard 100% position, or a specific software safety override has been triggered in the PMC (Programmable Machine Control) ladder logic. Common Causes of the WN57 Warning fanuc wn57 override function is active
Are you currently , or did this alarm appear unexpectedly on a machine that was previously running?
Verify that or Optional Block Skip (BDT) are not unintentionally conflicting with your current operation mode. Step 3: Inspect Safety Key-Switches
Look at the current program execution screen. Check if a modal G-code is forcing an override state. For example, some machine setups utilize specific macro variables or regional "The WN57 alarm is a serious machine fault
After setting all overrides to 100%, press the RESET button to clear the message.
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.
If the warning appeared right after a like a door opening or program interruption? Share public link Verify that or Optional Block Skip (BDT) are
Modifying PMC parameters requires proper training and authorization. Incorrect changes can affect machine operation or safety.
Verify if a specific M-code or macro in your current program is forcing an override state via the ladder logic. Impact on Production
Debugging and testing the sequence program during machine setup or intensive maintenance.
The machine may run at a permanently throttled feedrate or rapid speed, dramatically increasing cycle times.