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[ Feedback Device Absolute Zero ] ---> + [ Parameter 1860 Grid Shift Offset ] ---> = [ Actual Machine Zero ]
FANUC systems require a hard power cycle (turning the main breaker or control power off and back on) to initialize changes made to Parameter 1860.
Over years of heavy operation, machine castings shift, foundations settle, and geometric alignments change. During a geometry calibration (using a dial indicator and a precision square), technicians often use Parameter 1860 to fine-tune the absolute home position to bring the machine back into geometric tolerance. Step-by-Step: How to Calculate and Change Parameter 1860 fanuc parameter 1860 work
18;write_to_target_document1b;__0TuaZSsB7SyqtsPhLy5yAs_100;57; 0;a71;0;5e5; 0;11c5;0;288c; Series 16i-18i-MODEL B - Parameter Manual.pdf - Drivesul
: Select PARAM and go to parameter number 1860. [ Feedback Device Absolute Zero ] ---> +
On modern Fanuc systems, this parameter works in conjunction with Absolute Pulse Coders (APCs). When a machine is powered on, it doesn't need to return to a mechanical home switch to establish a position because the APC remembers its location. However, if the encoder battery dies or the motor is replaced, this memory is lost.
: If a machine loses its position (e.g., due to a dead battery or disconnected motor), parameter 1860 will automatically flip to 0 . To "work" the parameter back to 1 , the operator must perform a manual reference position return or set the position manually, after which the control updates this bit to confirm the axis is now "homed." Related Parameters Step-by-Step: How to Calculate and Change Parameter 1860
Input increments (0.001 mm or 0.0001 inch depending on standard system increments).
: When manual setting is required—often for complex configurations or when adding axes—Parameter 1860 is used to assign a specific Slave Number to each axis.
Many users mistakenly think 1860 is the only parameter needed to set a home position. In reality, it works as part of a set:
When a CNC machine executes a command to move an axis, the control system needs to know whether the encoder signal returning from the motor or linear scale aligns with the command. Setting Parameter 1860 correctly prevents the system from misinterpreting its own location, which would otherwise result in catastrophic servo alarms or runaway axes. The Core Function of Parameter 1860
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