Fanuc Parameter 1860 Full !!install!! (FREE ◆)

This article provides a full technical breakdown of Parameter 1860—its function, its relationship with other parameters, how to calculate it, common troubleshooting scenarios, and best practices for optimization.

When setting up the FANUC Servo Serial Bus (FSSB), the control uses Parameter 1860 alongside parameters like 1815 (Position Detector Type) and 2024 (Number of Pulses per Motor Rotation) to initialize the axis loop. How Parameter 1860 is Calculated

| Machine Type | Typical 1860 Value (mm/min) | Reason | |--------------|-----------------------------|--------| | Small milling | 500 – 2000 | Short deceleration zone, slower dog approach | | Large lathe | 2000 – 6000 | Heavy axis, needs consistent dog capture | | High-speed machining center | 1000 – 4000 | Balanced speed vs. repeatability | | Grinder | 200 – 1000 | Very fine reference accuracy required | fanuc parameter 1860 full

Officially known as the (or sometimes referred to as the linear acceleration time constant for each axis), Parameter 1860 directly controls how aggressively your machine’s axes accelerate during a cutting feed move. Getting this value wrong can lead to servo lag alarms, poor corner finishes, or even mechanical damage.

Unlike coordinate offsets that an operator can easily manipulate, Parameter 1860 is deeply tied to the Absolute Position Detector (APC) . It often uses "modular arithmetic," meaning the value will "wrap around" as the axis moves through its full range of motion. The Lifecycle of the Value This article provides a full technical breakdown of

Parameter 1821 (Reference Counter Size) must always match or cleanly divide into the feedback resolution cycle defined by Parameter 1860. If they do not align, the machine will fail to establish a repeatable home position.

The machine cuts perfect straight lines but oval arcs. This is often a mismatch between 1860 and the acceleration for the orthogonal axes. Ensure that the 1860 values for X and Y (or X and Z) are identical for circular moves. Uneven acceleration distorts circles into ellipses. repeatability | | Grinder | 200 – 1000

Use the horizontal axis selection keys to highlight the specific rotary axis you intend to modify ( Step 4: Alter and Confirm the Bit Value FANUC Series 0i-MODEL F PARAMETER MANUAL - Drivesul

Parameter 1860 and 1861 are not just configurable—they are for the absolute reference position derived during APC setup. If you manually change them without performing the proper reset, you will corrupt the absolute position reference.

| Problem | Cause | |---------|-------| | or PS0031 | 1860 set too high → reference point signal missed due to overshoot | | Inconsistent reference position (drift every cycle) | Speed too high for deceleration zone length (dog/switch timing mismatch) | | Long cycle time | 1860 set unnecessarily low (e.g., 100 mm/min on a large VMC) | | Machine overshoots reference point | 1860 > rapid rate (not allowed; parameter clamped internally) |