Fanuc Parameter 1860 Work (2025)

Understanding Fanuc Parameter 1860: Reference Position and Absolute Encoders

In Fanuc CNC systems, Parameter 1860 acts as the machine's memory for when using absolute pulse coders (APC). Unlike incremental encoders, which must hit a "limit switch" or "dog" every time the machine starts up, absolute encoders always know their position.

Because Parameter 1860 is a system-generated value, you do not "type in" a value manually. Instead, you perform a procedure to let the CNC update it: fanuc parameter 1860 work

If they match within a certain tolerance, the machine "remembers" its position immediately without requiring a manual zero return. Troubleshooting Common 1860 Issues

When you power on a Fanuc machine equipped with absolute encoders: Instead, you perform a procedure to let the

Most issues related to Parameter 1860 arise after a or motor replacement.

It is a critical, read-only system parameter used by the CNC to track exactly where an axis is relative to its reference (home) position. If the value in Parameter 1860 is lost or incorrect—often due to a battery failure—the machine will lose its "sense" of where it is, leading to homing alarms. What is the Function of Parameter 1860? If the value in Parameter 1860 is lost

It compares this value against the stored data in Parameter 1860 .

These indicate that the absolute position data has been lost.

When an axis is successfully homed (set with Parameter 1815.4 APZ), the current encoder count is saved into Parameter 1860.