Fanuc Parameter 1860 Work [top] May 2026

The CNC reads the current value from the encoder.

It typically uses modular arithmetic, meaning the value "wraps around" based on the encoder's pulses per revolution.

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:

These indicate that the absolute position data has been lost.

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

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.

Understanding Fanuc Parameter 1860: Reference Position and Absolute Encoders

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