In FANUC CNC systems, functions as the Grid Shift Value for Absolute Position Coders (APC) . This parameter allows field technicians and maintenance engineers to offset the physical reference position (machine zero) without mechanically moving the encoder housing or decoupling the motor shaft.
: Manual modification is rare and usually only done during advanced troubleshooting or when migrating parameters from a backup. cti-sumy.com.ua Are you currently troubleshooting a 300 APC Alarm (Ref Position Need Return) or have you recently replaced encoder batteries 64120EN 0i Parameter Manual.pdf fanuc parameter 1860 full
When a machine uses a linear scale (like Heidenhain or FANUC linear scales) mounted directly to the machine casting, it is a full-closed loop system. Here, Parameter 1860 must be calculated manually based on physical mechanics. In FANUC CNC systems, functions as the Grid
| Parameter | Name | Purpose | | :--- | :--- | :--- | | | Grid Shift (Reference Position) | Shifts the grid point for all reference returns. Used for mechanical dog adjustment. | | 1851 | Grid Shift Fine | Fine adjustment (usually in 1/1000 mm or 1/100000 inch increments). | | 1860 | Reference Position Shift | Shifts the position the machine considers "Zero" after the reference return is complete. Often used with Absolute Pusle Coders. | cti-sumy
Understanding FANUC Parameter 1860: The Complete Guide to Position Feedback Movement Amplitude