If you disconnect the motor from the ball screw, the physical relationship between the encoder and the machine zero changes.

The reference position is established . The system knows exactly where the axis is located based on the absolute encoder data. 2. When Does Parameter 1860 Revert to 0?

Unplugging the encoder cable or replacing the motor/encoder resets the stored position.

In a perfectly functioning machine, this parameter stays at "1" indefinitely. However, certain events will force it to "0," requiring a re-homing procedure:

(often referred to as APZ ) is a critical configuration setting in Fanuc CNC systems (such as the Series 0i, 16i, 18i, and 31i) that indicates whether the reference position for an absolute pulse coder has been established for a specific axis.

Absolute encoders rely on a backup battery to "remember" their position when the power is off. If the battery dies, the position is lost.

Understanding Fanuc Parameter 1860: Absolute Position Detection

Parameter 1860 is a where each bit typically corresponds to a different controlled axis (X, Y, Z, etc.).

A technician may manually change this bit to "0" to force a new home position calibration. 3. How to Set or Reset Parameter 1860