Fanuc Parameter 1860 -

On FANUC 0i, 16i, 18i, 21i, and 30i/31i/32i Series controls, defines the Position Detector Type for each individual axis. Specifically, it tells the CNC control what kind of feedback device (encoder) is mounted to the servomotor or the machine slide.

In systems where parameter 1860 controls two-stage backlash acceleration, incorrect values may cause either excessive shock or insufficient compensation.

Defines the feedback resolution or the specific multiplier factor for the position detector stream. The Power-Up Logic

Manually jog the axis to its physical home position (alignment marks or fixture zero). fanuc parameter 1860

Parameter 1860 does not work in a vacuum. To successfully configure an absolute positioning axis, it must work in harmony with a cluster of related parameters.

When things go wrong with the absolute positioning system, the FANUC control will display specific alarms: 1. 300 SV ALARM: [Axis Name] NEED ZRN

Press the SYSTEM hard key, type 1860, and press [No. SRH]. On FANUC 0i, 16i, 18i, 21i, and 30i/31i/32i

Some users may find that parameters 1860 and 1861 are listed in their machine's parameter screens but are missing from the official parameter manual, which may jump directly from 1856 to 1870. This occurs because these parameters are often specific to optional functions such as absolute position detection for rotary scales without revolution data or the Two-Stage Backlash Acceleration function. In such cases, the parameter documentation is found in supplemental or additional manuals rather than the main parameter manual.

: Indicates whether the zero-point (reference position) of the absolute pulse coder has been established. The Initialization Chain

Set APC (Parameter 1815#5) = 1.

Always keep a fresh SRAM or ALLIO backup of your FANUC parameters on a CF card or USB drive. If Parameter 1860 or 1815 gets corrupted, restoring from a backup takes minutes compared to hours of manual re-calibration.

The battery is completely dead. The absolute position data is lost entirely. Step-by-Step: How to Reset the Absolute Position

: Navigate to the parameter setting screen on the CNC machine. This often involves pressing a specific key or selecting a menu option. Defines the feedback resolution or the specific multiplier