To truly understand how Parameter 1860 functions in the field, let us walk through a real-world scenario from CNCZone, where a user with a Fanuc 21i-TA lost their machine zero after a servo repair.
In the world of high-precision CNC machining, the occupies a unique and somewhat mysterious position. While many common parameters like 1851 (backlash compensation) are frequently adjusted by technicians, Parameter 1860 is often described as an "untouchable" or "read-only" value that provides a fascinating look into the machine's internal logic. The Digital Pulse: What is Parameter 1860?
This is why you should generally attempt to calculate or manually input values into 1860. It is a "system" parameter. If you are troubleshooting a "Zero Lost" alarm (APC alarm), the solution is to re-zero the axis, not to hack the value. fanuc parameter 1860 full
Modifying CNC parameters can have serious consequences. Follow these guidelines to protect both personnel and equipment.
Parameter 1860 and 1861 are not just configurable—they are for the absolute reference position derived during APC setup. If you manually change them without performing the proper reset, you will corrupt the absolute position reference. To truly understand how Parameter 1860 functions in
Essential for systems using incremental or absolute pulse coders where the "Grid Method" is used for zero return. Why Adjust Parameter 1860?
When the procedure completes successfully: The Digital Pulse: What is Parameter 1860
If Parameter 1860 is set to 0 , the machine does not apply a specific clamp speed during deceleration/acceleration transitions. This allows the machine to use the full time constant defined in other parameters, resulting in smoother motion but potentially longer cycle times.
