Fanuc Parameter 1860 Work Review

: Always ensure that changes to parameters like 1860 do not compromise the safety of the machine operator or the integrity of the machine itself.

Go to the OFFSET/SETTING page and change "Parameter Write" to 1. Ignore the resulting alarm.

Ensure the machine is not running a program.

When a FANUC-controlled rotary axis is homed, the system records the machine position where the reference point is established. This positional data is stored in two parameters:

Altering axis parameters requires entering a specific system mode to prevent accidental machine movement. Follow these steps to safely modify Parameter 1860: Step 1: Enable Parameter Write fanuc parameter 1860

The axis does not use an absolute position detector (uses an incremental system). 1: The axis uses an absolute position detector.

FANUC Parameter 1860 is a fundamental cornerstone of the CNC’s position tracking architecture. By correctly identifying the feedback detector type, it enables the seamless operation of absolute positioning, saving your shop hours of unnecessary homing cycles.

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It is typically a 2nd-word (32-bit) axis parameter, often appearing as a large, sometimes confusing number that may wrap around due to modular arithmetic used by the encoder. Role in Reference Position Setting : Always ensure that changes to parameters like

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

This function was an early solution to manage lost motion in mechanical drive systems. Backlash, the inherent play between mechanical components like ballscrews and nuts, can cause positioning errors, especially during direction changes. A simple fixed backlash compensation might not be sufficient when the ballscrew is worn, as the backlash amount can vary based on load and position.

For rotary axes using a scale without rotary data (such as Heidenhain RCN723 or Futaba FRR902L3DB rotary scales), the reference position data stored in parameters 1860 and 1861 does not need to be renewed. This is because scale data without rotary data is always read when the system is powered on, providing immediate position information.

Fanuc parameter specifies the current position of an absolute position detector (absolute pulse coder) in machine coordinates. Ensure the machine is not running a program

Among these, plays a critical role in configuring the position feedback loop, specifically dealing with the type of encoder signal and the absolute position detection system. Misconfiguring this parameter can lead to severe axis runaway conditions, tracking errors, or communication alarms. What is FANUC Parameter 1860?

Inappropriate values were entered for the specific system configuration.

The control knows it should have absolute coordinates, but the reference position is lost.