Fanuc Parameter 1860 |link| Jun 2026

If 1860 is set equal to or higher than the rapid speed of that axis, the control will not decelerate properly. The axis may overshoot the dog, fail to find the marker, and trigger alarm or PS0091 (Zero point not found) .

When replacing a detector or battery, you often manually move the axis to the desired "Zero" and then toggle bits in parameter 1815 to force 1860 to synchronize with that mechanical position. fanuc parameter 1860

| Condition | Symptom | Root Cause | |-----------|---------|-------------| | (e.g., 2000 mm/min on a linear axis) | Axis slams into dog, overshoots reference point, inconsistent home position ± several encoder counts. May trigger overtravel alarm after homing. | High inertia prevents motor from stopping precisely on the marker pulse. | | 1860 too low (e.g., 30 mm/min) | Homing takes excessively long (10-20 seconds per axis). No immediate error, but wasted cycle time. | Creep speed is unnecessarily slow—the marker detection is reliable at moderate speeds. | | 1860 optimal (typical: 100-600 mm/min) | Fast, consistent reference return. Home position repeatable within 1 micron. | Speed allows motor to stop within one encoder count (or fractional count for serial pulse coders). | If 1860 is set equal to or higher