WN57 is not generated by the CNC core itself; it is generated by the based on specific diagnostic signals. The CNC sends a "mode change request" to the PMC. The PMC checks the following signals (typical addresses – confirm against your ladder diagram):
| Function | FANUC Signal Name | Typical Address | | :--- | :--- | :--- | | Machine Lock 1 | G104.0 | G116.0 (older) | | Dry Run | G104.7 | G116.7 | | Aux Funct Lock | G104.1 | N/A | | Handle Interrupt Mode | Input from rotary switch | Varies | fanuc wn57 override function is active
A: Yes. The 0i-Mate series (common on lathes and mills) exhibits WN57 identically for Dry Run and Machine Lock functions. WN57 is not generated by the CNC core
A: Check for a stuck physical switch (internal contact failure). Use the FANUC diagnostic screen (DIAGNOSIS → PMC → SIGNAL) to see if G104.0 (MLK) reads "1" even when the switch is off. This indicates a hardware failure in the I/O unit. This article is for informational purposes. Always consult your specific FANUC CNC manual and machine tool builder’s documentation before performing maintenance or altering operational procedures. The 0i-Mate series (common on lathes and mills)
If you encounter this warning frequently, it indicates an opportunity to improve operator training or refine your setup procedures. Remember: The machine is not broken; it is simply waiting for you to acknowledge that an override is still engaged.