The WN57 message indicates that the CNC system is currently restricting or modifying its standard motion parameters because a specific override function has been triggered.
The "Override Function" mentioned in this message refers to a specialized tool used by machine tool builders and maintenance technicians to debug the . When this function is active, it allows for the "forced" manipulation of PMC signals—effectively overriding the standard logic of the machine's ladder to test specific behaviors or troubleshoot faulty sensors.
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.
He toggled the Mode switch to MDI (Manual Data Input). He typed in a simple command to index the turret.
If this "override" or "force" function is left on, it can prevent normal PMC operation, such as closing a door safety interlock or allowing a turret to index, because the system thinks the forced state is the only state. Why Did the WN57 Alarm Appear? The WN57 Override function is active alarm appears because: fanuc wn57 override function is active
If the feedrate or rapid override is set below 100%, the machine moves slower than programmed. This increases total cycle time and lowers production efficiency. 2. Risk to Surface Finish and Tool Life
The override functionality is usually managed by a specific Keep Relay (K-Address) in the Fanuc system. According to typical Fanuc PMC mapping, the override function corresponds to the bit. Navigate to PMC -> PMCPRM -> KPRM (Keep Relay). Locate parameter K906.0 . Change the value to 0 (Disable). Restart the machine. Potential Risks of Ignoring the WN57 Alarm
It is incredibly useful for troubleshooting sensor issues, bypass safety interlocks momentarily, or testing logic during commissioning.
Verify that or Z-Axis Neglect modes are turned off. Step 3: Inspect PMC Parameters and System Variables The WN57 message indicates that the CNC system
Press the RESET button to clear the current look-ahead buffer.
Identify the you are using (e.g., Doosan, Makino)
On modern FANUC ROBODRILL machines, working inside the enclosure with the doors open requires entering a specific setup mode. Activating these key-switches or panel buttons bypasses standard safety protocols and automatically locks the machine into a low-speed override mode (often capped at 2 meters per minute or 25% rapid speeds) for operator safety. 4. PLC / PMC Keep Relay Configurations
Standard PMC ladder logic operations may be ignored in favor of the manual "force." In many systems, this function is tied to
Understanding the FANUC WN57 Override Function Is Active Message
Cycle the door open and closed to clear any sticking safety limit switches. Step 4: Analyze System Variables and G-Code
Running a tool at a lower feed rate than programmed alters the chip load, potentially causing tool chatter, work hardening, or poor surface finishes on the workpiece. Step-by-Step Troubleshooting and Resolution
: Illegal Override Function Setting (too many PMC paths active).