Fanuc Wn57 — Override Function Is Active

This is a debugging feature typically used during the setup or maintenance of PMC programs to force signals into a specific state. While active, it can prevent the PMC program from operating normally, as forced signals may override actual machine logic. How to Disable the WN57 Warning

Understanding the WN57 alarm requires distinguishing it from similar alarms that might appear on FANUC systems:

After setting all overrides to 100%, press the RESET button to clear the message. fanuc wn57 override function is active

A Keep Relay or parameter is forcing the machine to run at a reduced speed (e.g., during setup or dry run modes).

Machine operators encountering the WN57 alarm should: This is a debugging feature typically used during

If WN57 is active because a safety interlock sensor is failing or bypassed, it poses a risk to operators who expect the machine to behave under standard safety boundaries.

The WN57 alarm is classified as a PMC (Programmable Machine Controller) system alarm, specifically indicating that the PMC ladder program's override function has been activated. This function is a powerful debugging tool designed to assist engineers during ladder program development, but it must be properly managed to ensure safe and reliable machine operation. A Keep Relay or parameter is forcing the

What (e.g., rigid tapping, probing, automatic cycle start) triggers this code?

If you need help disabling a specific override or understanding a custom ladder message related to WN57, let me know your FANUC control model (e.g., 0i-MF, 31i, 18i).

When using an automatic probe (like Renishaw) to measure tool length or workpiece dimensions, the machine often enters a specialized mode where conventional feed rate overrides are ignored or modified. WN57 can indicate that the probe cycle is overriding the manual feed rate setting to ensure accurate, programmed measurement speeds. 4. Maintenance Mode