1860 | Fanuc Parameter

Cycle the power; the CNC will now write the new position into .

Power down the CNC system.

In the world of FANUC CNC controls, parameters are the DNA of the machine tool. They dictate everything from axis acceleration to I/O configuration. Among the hundreds of parameters, holds a critical, yet often misunderstood, role: controlling the reference position return speed (also known as "dog-type" reference return deceleration speed or approach speed).

Mastering FANUC Parameter 1860: The Complete Guide to Position Feedback and Absolute Encoders fanuc parameter 1860

If the setting of this parameter is modified, it is mandatory to perform a new reference position establishment operation. 3. How to Access and Change Parameter 1860

Because changing servo parameters can cause violent axis oscillation if configured incorrectly, proper safety protocols must be followed to enable editing on your FANUC controller (such as the Series 0i, 16i, 18i, 21i, or 31i series). Step 1: Enable Parameter Write (PWE) Alpha AC Servo Motor Parameter Mnl, GFZ-65150E/04

After completing this procedure, APZ should equal 1 to confirm successful synchronization. Cycle the power; the CNC will now write

What prompted you to look into Parameter 1860?

Enter the correct pulse count for your specific motor model.

is toggled from 0 to 1 (or resets automatically after a manual reference return cycle, depending on the FANUC series) to lock in the home coordinates. Common Alarms Related to Parameter 1860 They dictate everything from axis acceleration to I/O

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

| Control Series | Primary Function of Parameter 1860 | |---|---| | Series 0i-MC (and earlier) | First acceleration value for Two-Stage Backlash Acceleration function | | Series 16i/18i/21i (Model A/B) | Reference point value (with 1861) for axes using rotary scales without revolution data | | Series 30i/31i/32i | Reference point data renewal control for rotary axis A type with absolute pulse coder | | Series 15i/150i | 1st acceleration value for backlash acceleration (when enabled by 1957#6) | | Series 21i-T | One of multiple parameters (including 1250, 1401, 1860, 1861, 5002, 5003) used for APC reference position preservation |

When the two-stage backlash acceleration function is enabled, parameter 1860 defines the . This value determines how quickly the servo system accelerates during the initial stage of backlash compensation. Related control parameters include No.1957#6 (which selects the acceleration mode) and No.1987 (which sets the acceleration value for each direction).

The following step-by-step procedure re-establishes absolute encoder synchronization, automatically generating correct values for parameters 1860 and 1861:

On FANUC CNC controls (such as the Series 0i, 16i, 18i, 21i, and 30i/31i/32i models), defines the Grid Position Shift Amount for each axis.