Fanuc Parameter 1860 'link' Online

A: The spindle will not orient at all – it may drift or refuse to complete M19. Never set to zero intentionally.

It is most critical during the initial power-up sequence or after a battery failure in the absolute encoder, where the machine must re-verify its physical location. Practical "Review" for Users fanuc parameter 1860

“We’re going to talk to the motor directly,” she said. “Bypass the controller. Ask it where its soul is.” A: The spindle will not orient at all

“I have to teach it.”

You will likely interact with or notice this parameter during specific maintenance scenarios: fanuc parameter 1860