Check if NRT is set to 1 (which blocks the automatic update of 1860/1861 during 360-degree rollovers). Conclusion
Based on real-world field experience from CNCzone, the documented reset process that includes Parameter 1860 is as follows:
If the machine tool coordinate exceeds the value set in , the CNC rounds the value using the logic specified. APZ in 1815: Must be 1 for absolute positioning.
Unplugging the encoder cable or replacing the motor/encoder resets the stored position. fanuc parameter 1860 full
Disclaimer: Parameter numbers and behavior can vary slightly between FANUC control series (e.g., 0i-TD vs 31i-A). Always refer to the specific FANUC operator’s manual for your control model.
When an axis is "zeroed" or re-homed using Parameter 1815 (APZ bit), the system recalculates and updates the value in 1860.
: After significant mechanical work that shifts the physical relationship between the motor and the machine's home position. Accessing the Parameter To view or set this parameter, follow these steps: How to Enable Parameter Write Enable (PWE) on a Fanuc CNC Check if NRT is set to 1 (which
After rebooting, set PARAMETER WRITE back to 0 and press RESET to clear the alarm. Pro-Tip: The Grid Shift Limit
You generally do not manually edit Parameter 1860 during standard operations. It is typically updated by the CNC system automatically during the procedure. Modification is usually only necessary during:
| Parameter | Name | Purpose | | :--- | :--- | :--- | | | Grid Shift (Reference Position) | Shifts the grid point for all reference returns. Used for mechanical dog adjustment. | | 1851 | Grid Shift Fine | Fine adjustment (usually in 1/1000 mm or 1/100000 inch increments). | | 1860 | Reference Position Shift | Shifts the position the machine considers "Zero" after the reference return is complete. Often used with Absolute Pusle Coders. | Unplugging the encoder cable or replacing the motor/encoder
In FANUC CNC systems (such as Series 16i/18i/21i and 0i), Parameter 1860
Detection units (the smallest increment the machine can move).
Some machine builders (like DMG Mori, Haas, Mazak - though Mazak uses their own parameter numbers) lock certain parameters. You may need to disable parameter protection via a different Keep Relay or data protection key.
Press the soft key to open the Handy Setting screen. Move your cursor to the item labeled PARAMETER WRITE . Input 1 and press the [INPUT] key.