Setting will immediately deactivate the function and clear the WN57 alarm after a system restart.
The of your machine (e.g., ROBODRILL α-D21SiB).
In many systems, this function is tied to a specific keep relay. Setting K906.0 to "0" will often immediately deactivate the override function and clear the WN57 message. fanuc wn57 override function is active
When a signal is overridden, it is visually distinct from a signal that is simply ON due to a physical input (like a pressed button). On the PMC signal status screen, overridden signals are indicated by a ">" symbol placed before the address.
| DO | DON'T | |---|---| | | Ignore the alarm because 'the machine is working' | | Always turn off the override function and verify K906.0 is 0 before final acceptance | Use the override function for permanent machine operation | | Document any changes you make for future maintenance | Change other K parameters without understanding their function | | Only use the override function during development on a test stand | Ship a machine to a customer with WN57 active | Setting will immediately deactivate the function and clear
The specific designation "WN57" in Fanuc diagnostics is frequently associated with watchdog timers or internal software alarms related to servo control and parameter integrity. While override messages are usually informational (e.g., "Feed Override 100%"), the specific phrasing "Override Function is Active" in the context of a WN57 alarm often points to a scenario where the control system has forced a specific feed rate—usually a significantly reduced one or a rapid override lock—due to a perceived error.
On many FANUC models, this function is directly tied to a specific Keep Relay. Locate . Change the bit value from 1 (Active) to 0 (Inactive). Restart the system if necessary to clear the message. Precautions Setting K906
In many documented instances, this alert appears when the CNC system detects a discrepancy in the servo system or parameter integrity. The system effectively forces an override state to slow the machine down, preventing a high-speed crash while the underlying fault exists. It acts as a fail-safe: the control logic dictates that because it cannot trust the programmed values or the servo feedback loop implicitly, it defaults to a safety mode, alerting the operator via the WN57 status.
Include override function activation in maintenance logs.
Always check the current operation of your machine when this message appears. If the machine is performing a normal cycle, the message can usually be ignored, or it will disappear once the specialized cycle finishes.
In the FANUC control ecosystem, codes prefixed with a "WN" indicate rather than "AL" (Alarms).