The alarm vanished.

In simple terms,

Changing parameters on a FANUC controller requires caution and PWE (Parameter Write Enable).

If 1860 does not match the actual physical position, it typically triggers a 300-series SV Alarm (e.g., SV300 APC Alarm: Needs Ref Return). ⚠️ Warning

On older controls (0i, 16i, 18i, 21i), 1860 may be integer only; newer controls allow decimal values for fine adjustment.

Under normal operation, the CNC updates this value automatically as the axis moves.

This guide provides a detailed look at parameter 1860, how to configure it, and when to adjust it for optimal machine performance. 1. What is FANUC Parameter 1860?