Observe the CNC status screen to see if the warning clears instantly. Step 2: Check the CNC Status Monitor Press the (Position) or MDI key on the FANUC MDI panel.
Check the robot teach pendant for any active faults or paused states.
This is not a critical machine failure, but rather a . Here is a breakdown of what it means, why it appears, and how to resolve it.
After setting all overrides to 100%, press the RESET button to clear the message.
Select the softkey, then navigate to STATUS or DIAGNOSIS . fanuc wn57 override function is active
The Machine Tool Builder writes custom PLC/PMC ladder logic to control physical buttons, coolant systems, and safety doors. If a specific system macro variable (such as system variables managing feedrate overrides like #3004 ) has been modified via a custom program or a probing cycle, the control triggers WN57 until that variable is reset to its default state. Step-by-Step Troubleshooting Guide
The machine will typically continue to run the program.
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.
Check the actual percentage values displayed next to Actual Feed or Override . If any value displays something other than 100% (e.g., 90% or 0%), target that specific system switch. Step 3: Verify Safety Doors and External Interlocks Observe the CNC status screen to see if
Did this alarm appear , or right at machine startup ?
Did this warning appear or during setup ? Are the physical knobs currently set to 100% ?
: This message often triggers when the machine is in a "Setup" or "Maintenance" mode where standard safety interlocks (like door switches) are bypassed, or when the feedrate is locked to a specific percentage (e.g., 100%) to ensure predictable behavior during automated cycles. Common Causes & Solutions
这个对比表有助于建立一个更完整的知识体系：WN57报警的“倍率”是面向PLC程序开发的调试工具； OVERRIDE 指令是在代码内部对运动速度的自动控制；而面板上的“倍率旋钮”则是操作员手中的实时调速工具。三者服务的对象和功能定位完全不同。 This is not a critical machine failure, but rather a
This function allows maintenance technicians or machine tool builders to "force" PMC signals (inputs/outputs) to a specific state, overriding their actual physical input. This is used for debugging and testing the ladder program.
Physically turn each dial away from 100%, then firmly click or seat them back exactly onto the mark.
WN58 is a related warning. It indicates a significant mismatch between the PMC program (the ladder) and the version of the FANUC CNC firmware. FANUC continuously improves and changes its "function instructions" (codes). If you install a PMC program written for a newer CNC onto an older one, the older CNC may not recognize a new command, triggering WN58.
| Symptom | Likely cause | Action | |--------|-------------|--------| | WN57 only, machine runs fine | Override ≠ 100% | Accept or set all overrides to 100% | | WN57 + no cycle start | Builder lock active | Set all overrides to 100%, dry run OFF, then RESET | | WN57 appears after power-on | Stored override value | Reset control, check last active override | | WN57 + weird axis movement | Custom PMC override mode | Call machine tool builder |