Fanuc Parameter 1860 [portable] May 2026

If the value in Parameter 1860 is corrupted or doesn't match the expected feedback, the CNC will trigger an alarm to prevent crashes:

The CNC router, a five-axis beast named “Goliath,” had fallen silent. Not the good silence of a job well done, but the terrible silence of a catastrophic alarm.

use 1860 to compensate for a misaligned mechanical zero. That is what 1850 is for. Incorrectly raising 1860 to force alignment will only lead to erratic behavior and possible drive failure.

Excessively high 1860 causing limit-cycle oscillation near the setpoint.

This article applies to FANUC Series 0i, 16i, 18i, 21i, 30i, 31i, 32i, and Power Motion i controls. For specific machine tool builder variations, consult your original machine documentation.