Fanuc - Parameter 1860 Full Extra Quality

The following is a general procedure for re-establishing the absolute reference position using Parameters 1815 and 1860/1861:

Before changing any parameter, perform a complete backup of all CNC parameters, including PMC parameters. Many modern FANUC controls support this via memory card or RS-232.

To understand 1860, we must first understand the Grid Method. When you perform a Zero Return (often written as G28 or manually pressing the reference return button), the machine does not simply "know" where zero is. Instead, it moves toward a Deceleration Dog (physical limit switch). Once it hits the dog, the axis decelerates and searches for the first "Grid Point" of the servo motor's encoder. Parameter 1860 tells the control to shift that Grid Point by a specific amount. fanuc parameter 1860 full

Whether the axis uses a or just the motor encoder Any alarm codes currently showing on the screen Share public link

By understanding the multiple lives of Parameter 1860, you will be equipped to troubleshoot home position problems, optimize acceleration performance, handle absolute encoder resets, and avoid costly parameter-related errors on your FANUC-controlled machine tools. The following is a general procedure for re-establishing

: This bit determines if an absolute position detector is being used for that axis (1 = absolute, 0 = incremental).

The best approach is systematic: start with the machine builder's recommendation, use the acceleration formula to find a theoretical minimum, test with a representative part, and adjust in small increments. By mastering Parameter 1860, you unlock the true performance potential of your Fanuc CNC—moving from a machine that just "runs" to one that runs efficiently, accurately, and reliably. When you perform a Zero Return (often written

One of the most perplexing experiences for a technician is finding Parameter 1860 listed in the axis parameter display but discovering that the with no mention of 1860. This has been documented on platforms like Practical Machinist, where users notice 1853, 1855, 1856, 1860, 1861, and 1865 all present but the book provides no explanation.

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