Fanuc Parameter 1860 Full ((top)) < 90% Confirmed >

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.

For a standard linear axis with an absolute encoder, when you successfully complete a reference point return, the control automatically updates these values. The specification guide for the Series 30i/31i/32i explicitly states: "When machine position passes 0 degree or the shift value per one rotation... the data for the reference position (parameter No.1860, 1861) is renewed." fanuc parameter 1860 full

controls the reference counter size for semi-closed loop axes. A "full" or correct setting ensures one motor revolution corresponds exactly to the counter’s maximum count, providing stable and repeatable reference point return. For most systems, this value is 1 when Parameter 1820 equals the encoder’s reference pulses per revolution. Incorrect values lead to positioning faults and reference point instability. Always verify with machine tool builder documentation before modification. Disclaimer: Parameter numbers and behavior can vary slightly

: Parameter 1860 is a system-controlled register. If you type a value into 1860 and cycle the machine power, the control recalculates its relationship with the absolute encoder and wipes out your manual input , replacing it with its own calculated value. For most systems, this value is 1 when

: When the machine is powered off, the absolute encoder (supported by a battery) keeps track of movement. Upon power-up, the control compares this data with Parameter 1860 to restore the absolute coordinate system immediately.

When a machine uses a linear scale (like Heidenhain or FANUC linear scales) mounted directly to the machine casting, it is a full-closed loop system. Here, Parameter 1860 must be calculated manually based on physical mechanics.

You cannot effectively manage Parameter 1860 without understanding , as they are the two halves of the absolute positioning system.