Never assume Parameter 1860 means the same thing on every FANUC control. Always reference the correct parameter manual for your specific CNC model.

Fanuc stores the current position data of the absolute pulse coder (APC) for each axis.

If the machine moves 100mm on the display but only 50mm physically, the relationship between Parameter 1860 and the Flexible Field Gear (Parameter 2084/2085) is likely mismatched.

In the Fanuc ecosystem, specifically for Alpha and Beta series servo motors, Parameter 1860 works in tandem with the Absolute Pulse Coder (APC). While Parameter 1815 bit 5 (APC) enables the absolute position function, Parameter 1860 defines the resolution of that position. Standard values often depend on the specific encoder type: Most modern Alpha i encoders use a value of 1,000,000. Older models may require values like 8,192 or 65,536.

If you replace a motor with a different generation or encoder type.