Fanuc Wn57 Override Function Is Active !exclusive! Jun 2026

Walk up to the operator panel and verify the positions of the manual override dials:

当您正在操作一台配备FANUC数控系统的机床时，控制器屏幕上突然弹出一条**WN57“OVERRIDE FUNCTION IS ACTIVE”**的报警信息。这并非机床发生了机械故障，也不是硬件损坏，而是一个来自PLC（可编程逻辑控制器）的“警戒”信息，它在提醒您：机床的PMC程序正运行在一个特殊的调试模式中。

The "WN57 Override Function is Active" message on a Fanuc CNC typically refers to a specific condition within the ladder logic . This message is generally not an error code from the Fanuc system itself, but a custom operator message or warning defined by the Machine Tool Builder (MTB). Core Meaning fanuc wn57 override function is active

When WN57 triggers, the CNC system detects that the override matrix—which governs the relationship between the programmed feedrate (

On certain models like the Fanuc 30i/31i/32i, excessive override paths (more than three) may trigger related alarms (like ER47) that require a full CNC restart to clear after settings are adjusted. ladder logic addresses Walk up to the operator panel and verify

An engineer or technician may have left the function on after troubleshooting the ladder logic or testing I/O signals. Multi-Path Limitations:

This status is often triggered when a user or technician is "forcing" I/O points to test logic without actually firing physical sensors or switches. On newer controls like the Series 30i/31i/32i, an ladder logic addresses An engineer or technician may

To clear the WN57 alert and return the machine to its standard operating state, follow these diagnostic steps: Step 1: Inspect the Physical Operator Panel

The WN57 alarm appears when the feature is active. This tool is primarily used by developers or maintenance technicians during the debugging process to:

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