Fanuc | Parameter 1860 ((full)) Full
According to official Fanuc Parameter Manuals, the internal CNC software automatically computes and overwrites the contents of 1860, 1861, and 1862 whenever an official absolute reference position establishment (homing) routine is successfully executed. If an operator attempts to key in a random value directly, a machine power cycle will typically cause the system to reject the edit, rewrite it, or throw critical servo sync alarms. How Parameter 1860 Operates in the Background
In the vast ecosystem of FANUC CNC parameters, certain numbers are famous for simple functions like handwheel feed rates (No. 1430), while others are infamous for their mystery. Parameter 1860 belongs firmly in the second category. Search any FANUC forum, and you will find a trail of confused engineers wondering why their machine lost zero, what the difference is between 1860 and 1861, or why a "Backlash Acceleration" setting is suddenly breaking their rotary axis alignment.
Parameter 1860 is a where each bit typically corresponds to a different controlled axis (X, Y, Z, etc.).
Where:
: The value is established after an axis is successfully zeroed using Parameter 1815.4 (APZ)
| Parameter | Function | Interaction | |-----------|----------|-------------| | | Rapid traverse (G00) | Must be ≥ 1860 in value | | 1850 | Grid shift | Fine reference point offset; 1860 affects grid capture reliability | | 3001 | Reference point deceleration signal (dog length) | If dog is short, 1860 must be lowered | | 1826 | Position coder 1-revolution signal check speed | Must be higher than 1860 to detect reference mark |
A Fanuc Robodrill (16i control) lost absolute encoder batteries over the weekend. After replacing batteries, the Z-axis zero was off by -12.345 mm (the tool changer finger crashed into the spindle). 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
When users search for "Fanuc parameter 1860 full," they often need to calculate a value that completely moves zero by a known amount. Here is how to do it correctly.
After setting or resetting Parameter 1860: According to official Fanuc Parameter Manuals, the internal
| Indicator | Interpretation | |---|---| | Manual skips 1860 | The MTB may be using 1860 for a custom function not covered in base FANUC docs. | | 1860 has non-zero value | The MTB configured it; do not change without documentation. | | 1860 listed same axis format as 1853–1856 | Suggests gear ratio or specialized axis compensation use. |
. This value represents the amount of shift required to align the absolute encoder's internal reading with the machine's actual reference position. Key Functions & Characteristics
It depends on the display unit setting. If your machine is set to "inch display," the value will appear with a decimal (e.g., 0.5000). Internally, it still works in whole detection units. 1430), while others are infamous for their mystery
Do not attempt to calculate or "tune" Parameter 1860 manually. Allow the CNC to write to it automatically. If you find corrupted values, reset both 1860 and 1861 to zero, re-home the machine, and let the CNC repair itself. This approach will resolve 99% of all Parameter 1860 related issues.
