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Fanuc Parameter 1860 !!install!! Full Info

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

is the underlying numerical value the encoder reports at that exact spot. It is almost never manually edited by an operator; instead, the CNC system calculates and updates this value automatically when you perform a reference point return or set the (Absolute Position Zero) bit. ⚙️ The Mechanics of Parameter 1860

: Stores the APC counter value when the axis is at the reference point. Relationship to 1861 : Because APC values can be very large, parameter fanuc parameter 1860 full

is often used as a continuation of 1860 to handle higher-order bits. : Typically a 2-word axis

type, meaning it can store large integers separately for each axis. ⚠️ When to Interact with 1860 Reference Point Recovery In Fanuc CNC systems (Series 16i/18i/21i and 0i-MODEL

: When an absolute encoder battery dies, the machine "forgets" the relationship between its physical position and the encoder count. Setting 1815 bit 4 (APZ)

to 1 at the correct physical location triggers the CNC to take the current encoder reading and write it into Maintenance Warnings : Changing manually will force a Power Cycle (Alarm 000) and will likely cause the to reset to 0, requiring a new homing procedure. 🛠️ How to View and Set Reference Positions Alarm PS 000 (Parameter write enabled) This is

If you are looking for "1860 full" because you are resetting your machine's home after a battery failure, follow this standard procedure: Series 16i-18i -MODEL B - Parameter Manual.pdf - Drivesul

Alarm PS 000 (Parameter write enabled)

This is not an error, but a reminder. Set PWE back to 0.

Troubleshooting: Signs of Wrong Parameter 1860

  • Reference point shifts inconsistently after power-off/on.
  • Grid alarm (Alarm 90 – Reference return incomplete).
  • Axis returns to slightly different position each time.
  • Unstable absolute position after battery loss (if APC=0, incremental mode).

How It Works (Simplified Control Loop)

  1. CNC Calculates Command: The control determines a target velocity for the axis.
  2. Smoothing via 1860: Instead of applying the full velocity command instantly (which would cause a mechanical jerk), the CNC feeds the command through an exponential acceleration/deceleration filter. The time constant (1860) defines how long it takes to reach approximately 63.2% of the target speed.
  3. Velocity Command to Servo: The smoothed command is sent to the servo amplifier.
  4. Motor Response: The motor accelerates according to the defined curve.

A smaller 1860 value means faster acceleration/deceleration (sharper moves). A larger value means gentler, slower ramping.

Why Correct Setting of 1860 Matters

  • Incorrect 1860 → Reference point will not be at the same position after power cycles or grid shifts.
  • Full utilization (setting equal to full encoder resolution) maximizes positioning repeatability.
  • It interacts with Parameter 1850 (Grid shift) to fine-tune reference point location.