: The internal computer calculates the discrepancy between the mechanical "Zero" and the current digital encoder count.
a (mm/s²) = Vc / T
When a machine is equipped with absolute encoders, it does not require a manual "home" or zero-return operation every time it is powered on, provided the absolute position is correctly saved. Parameter 1860 is the system's "flag" that tells it whether this position is currently valid. 1. The Core Meaning of Parameter 1860 fanuc parameter 1860 full
Typically, parameter 1860 is set to a value between 0 and 100, where:
: This bit determines if an absolute position detector is being used for that axis (1 = absolute, 0 = incremental). : The internal computer calculates the discrepancy between
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.
is often used as a continuation of 1860 to handle higher-order bits. : Typically a 2-word axis If you manually change them without performing the
: 2-Word / Signed Double Word (depending on system resolution).
Parameter 1860 is used by the CNC control to track the physical location of an axis even when the power is turned off, provided the machine is equipped with absolute encoders and battery backup. Homing & Synchronization