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.
The operational impact of the WN57 alert is immediate and significant. The machine will likely enter a "feed hold" state or refuse to execute cutting commands at programmed speeds. In some configurations, the machine may lock the override at 0% or a minimal jogging speed, rendering it unable to perform automatic operations. This is a protective measure; without valid parameters, the tool path calculations could be erroneous, leading to tool breakage, part scrap, or collision with fixtures.
The condition that triggers this override is currently met.
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 fanuc wn57 override function is active
is the specific hexadecimal or decimal identifier assigned by the machine tool builder (MTB) or FANUC's system software to signify an active override condition.
If physical dials do not clear the warning, the issue resides in the software interface: Press the SYSTEM hardkey on the FANUC panel. Navigate to the PMC softkey →right arrow PMCDGN (Diagnostics) →right arrow STATUS .
A: Yes. The 0i-Mate series (common on lathes and mills) exhibits WN57 identically for Dry Run and Machine Lock functions. The specific designation "WN57" in Fanuc diagnostics is
This message——appears on FANUC CNC controls (often on series like 0i, 30i, 31i, 32i, or 21i) when the control is operating in a special override mode that bypasses certain safety or standard operating limits.
Unlike critical red-text alarms that halt production immediately, this is a yellow-text warning message. It serves as a status notification rather than a hard failure. However, leaving it unaddressed can impact your cycle times, part finishes, and automated cell communications.
Find the field labeled (or similar terminology). Move the cursor to this option and set it to "NO" or "0" . The machine will likely enter a "feed hold"
If a manual intervention occurs mid-cycle—such as pausing execution via Feed Hold or switching the machine into Single Block mode while an override parameter is processing in the background—the ladder logic may flag the state as WN57 until the cycle resumes normally. Step-by-Step Troubleshooting and Resolution
The rotary switch governing the spindle RPM is adjusted away from the 100% baseline. 2. PLC / PMC Interlock Logic
If the warning appeared right after a like a door opening or program interruption? Share public link
