In Fanuc CNC systems, Parameter 1860 (APOS) stores the absolute position of each axis
If you encounter a (Request for Reference Position Return), check parameter 1860. If the APRS bit is 0, the CNC has "forgotten" where it is. You will need to enable Parameter Write (PWE) and perform the homing procedure specified by your machine tool builder to reset it. fanuc parameter 1860 work
If the stored position in 1860 suggests the machine is outside its travel limits upon startup, you may need to power on while holding "P" and "CAN" (Cancel) to bypass the check and re-home the axis. Step-by-Step: Setting the Reference Position In Fanuc CNC systems, Parameter 1860 (APOS) stores
Under normal operation, the control updates this value automatically as the axis moves. ⚠️ Common Scenarios & "Work" Involved Search for the Parameter: Fanuc Parameter 1860 is
: It is used to shift the reference position by a specific amount of pulses, allowing technicians to align the machine’s coordinate system without physically moving the limit switches or motor couplings. Absolute Position Data
is a critical coordinate system setting that manages the relationship between the machine’s mechanical zero and its absolute position detection system. This parameter is specifically used on machines equipped with absolute pulse coders (APCs) to ensure the control always knows exactly where the tool is, even after a power cycle. Core Function and Purpose