Fanuc Parameter - 8901 Better

Fanuc Parameter 8901: In-Depth Technical Explanation

1. What is Parameter 8901?

Parameter 8901 (sometimes listed as bit parameters 8901.0 through 8901.7) controls the Grid Shift Reference Point Return method and the Dogless Reference Return behavior on many Fanuc CNC controls, particularly Series 0i, 16i/18i/21i, 30i, and 31i.

Note: Always back up your current parameters before making changes (I/O > Punch). fanuc parameter 8901 better

• Myth: “8901 = 1 is only for advanced users.”
  Fact: It is actually more beginner-friendly because it behaves logically.
• Myth: “Changing 8901 will crash my machine.”
  Fact: It will not cause a crash. However, existing offsets may read incorrectly. Always re-touch off tools after changing this parameter.
• Myth: “It doesn't matter on a mill.”
  Fact: Parameter 8901 is typically only relevant on lathes and mill-turn machines. Mills use different offset logic.

• Recommended Setting: 00001001 (Binary) or 9 (Hex/Decimal depending on input method).
• Rationale:

  Combine with 1850 = 10 to 50 and 1821 as required. Fanuc Parameter 8901: In-Depth Technical Explanation 1

  1 System fan, 701 alarm, 8901#0 parameter is changed to 1 to temporarily shield the alarm (OIC system); www.jidemachinery.com Common CNC Machine Parameter Guide - ALLPCB Myth: “8901 = 1 is only for advanced users

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