Fanuc Wn57 Override Function Is Active Here

The WN57 message triggers when the physical override dials on the operator panel are set away from 100%, or when a software-driven override is applied through the PLC (Programmable Logic Controller).

The message is a specific PMC (Programmable Machine Control) alarm found on FANUC CNC systems . It indicates that the Override Function —a debugging tool used to manually force PMC signals—is currently enabled .

Check system variable #3004 . If #3004 is set to a value of 1, 2, or 3, it intentionally disables or alters feed hold and override functions. Resetting the control via the key usually reverts this variable to 0. Step 5: Diagnose Hardware via PMC Diagnostics

If the warning was triggered by an interrupted macro program (like a tool setter or workpiece probe cycle), the system variables might be locked. Switch the machine to . Press the PROGRAM key. fanuc wn57 override function is active

When the WN57 alarm is active, you will typically see the following displayed on your FANUC CNC control screen:

“I can clear WN57 by pressing RESET + CAN together.”

Automated cells may experience timing desynchronisation between the CNC machine and external automation layers. Step-by-Step Troubleshooting and Resolution The WN57 message triggers when the physical override

If the warning appeared right after a like a door opening or program interruption? Share public link

The WN57 code is a warning (indicated by the "WN" prefix) rather than a hard alarm (often prefixed by "AL"). It signals that an override function on the CNC operator panel or within the software parameters is currently modified from its standard 100% baseline.

within the PMC program without needing the actual machine hardware to be in a specific position. Check system variable #3004

Check if an external sensor (like a door interlock, coolant level sensor, or chuck clamping switch) is forcing an override value through the ladder logic. Conclusion

在FANUC众多的报警体系中，WN57属于“WN报警”（Warning Alarm）类别，相较于ER报警，它通常不会直接导致设备停机，但却是必须关注的重要提示。本文将详细解析这个报警的根源、影响、处理步骤以及其背后的技术原理，帮助操作人员和维护工程师全面理解并正确应对。

This function is most commonly tied to safety protocols, automated loading sequences, or manual setup modes. Common Causes of WN57

If the machine is tied to a bar feeder or robot, check that the auxiliary unit is in "Auto" mode and signaling a ready state.

K906.0 specifically enables or disables the override function. Other important K parameters include: