When you power on a Fanuc machine equipped with absolute encoders:

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.

Understanding Fanuc Parameter 1860: Reference Position and Absolute Encoders

If you reset Parameter 1815 but the machine doesn't move to the correct spot, the value in 1860 will often change automatically once a new reference point is established.

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