: Vertical mill with βiA encoder (8000 pulses/rev). Parameter 1820 = 8000 (no division). 1860 should be = 8000 ÷ 8000 = 1.

Put the machine in MDI Mode . Go to the SETTING page and set PARAMETER WRITE (PWE) to 1 . (Note: This will trigger a P/S 100 alarm, which is normal).

| Method | When to Use | Risk Level | | :--- | :--- | :--- | | | After replacing a limit switch or deceleration dog. | Medium | | Reference Position Shift (1860) | After replacing absolute encoder or battery. | High | | Work Shift (G54-G59) | Daily part setup. No permanent machine change. | Low | | External Offset | Temporary tool length changes. | Low |

However, if you set Parameter 1860 to a low value (e.g., 100 mm/min), you force the machine to slow down significantly during feedrate changes. This creates a "soft start" effect that reduces mechanical stress on the servo motors during heavy cuts, but it often causes or "dogs" in the part profile because the machine physically cannot accelerate out of the corner fast enough.

In Fanuc CNC systems (Series 16i/18i/21i and 0i-MODEL B/C/D/F), Parameter 1860 current position of the Absolute Pulse Coder (APC) at the reference position. While parameter is used to tell the control "where" home is, parameter