Fanuc Parameter 1860 Full _verified_ Jun 2026

When executing a coordinate calibration or recovering from an absolute pulse coder battery failure, Parameter 1860 bridges the gap between the machine's absolute electrical grid and its actual physical alignment. Parameter Technical Overview : 1860 Data Type : Two-word axis (Long Integer) Valid Range : -99999999 to 99999999 Default Value : 0

: 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.

Official documentation, such as the Fanuc Parameter Manual , warns that these low-level servo parameters are "intellectual property" of the manufacturer and should not be modified without expert knowledge. Misconfiguring these can lead to "illegal servo parameter" alarms or, worse, mechanical crashes. fanuc parameter 1860 full

Parameter 1860 is defined as a bit-type or axis-specific variable depending on the exact generation of your FANUC control system (such as the Series 0i, 16i, 18i, or 31i). Its primary behavior centers around the or reference point updating logic. The Core Setting Logic

: Used to set the absolute position detector (APC) and the zero position (APZ). Setting is what initializes the value in 1860. Parameter 1240–1243 When executing a coordinate calibration or recovering from

A 4th or 5th axis rotary table has high inertia. Setting 1860 too low on the rotary axis will cause "clunking" on start/stop. For a rotary axis, start with 1860 = 150 ms. Increase until motion is smooth, even if it slows indexing.

: This bit indicates if the reference position for an axis has been established (1 = established, 0 = not established). Official documentation, such as the Fanuc Parameter Manual

When you execute G28 X... Y... Z... , the reference point return occurs in :

Note: For modern machines with high-quality ball screws and low friction, lower values (20-40%) are often sufficient. 4. How to Tune Parameter 1860

For rotary axes (specifically Type A rotary configurations), standard behaviors can change based on parameters linked to the system's rotation handling. For instance, when a rotary axis crosses its 360-degree boundary or wraps around:

This is the most serious consequence. You calculated the shift in the wrong direction.