Fanuc Wn57 Override Function Is Active [better] -

"WN57 OVERRIDE FUNCTION IS ACTIVE"

The message is a specific Programmable Machine Control (PMC) alarm found on Fanuc systems, indicating that the system's "Override Function" (倍率功能) has been enabled.

helpful feature

While it may appear as a warning, this "Override Function" is a designed for safety and process verification during machine setup or program testing. Key Benefits of the Override Function fanuc wn57 override function is active

SV (Servo Alarm): Issues with motors or drives.

PS (Program/Sequence Alarm): Errors in G-code or macro syntax.

SP (Spindle Alarm): Spindle drive or motor faults.

WN (Warning): A non-critical condition that restricts operation but does not indicate hardware damage.

When any of these functions are in an "active" state, the CNC is technically not in pure Memory or MDI operation. The WN57 warning appears when you attempt to change modes (e.g., from EDIT to MEM) or start a program while one of these overrides is still engaged. "WN57 OVERRIDE FUNCTION IS ACTIVE" The message is

PMC Override

The WN57 alarm appears when the feature is active. This tool is primarily used by developers or maintenance technicians during the debugging process to: SV (Servo Alarm): Issues with motors or drives

Over-temperature, excessive torque or other axis protection routines triggering reduced feed/rapids.

Myth 4:

“The machine is safe to run if I ignore WN57.”

While useful for testing, this function should be disabled once debugging is complete. If left active, it can:

The FANUC WN57 override function offers several benefits to CNC machinists and manufacturers, including: