Fanuc Parameter 1860 Jun 2026

The moment 1815.4 is set to 1, the CNC takes the current raw data from the encoder and writes it into Parameter 1860 . This creates the permanent link between the electrical encoder signal and the mechanical zero of the machine. Common Troubleshooting Scenarios

Here’s a short story inspired by , which in real life controls the reference counter capacity for the C-axis (spindle orientation) on many Fanuc CNC controls.

It's essential to understand which of these roles applies to your specific FANUC control series (e.g., 0i, 16i, 18i, 21i) before making any adjustments.

cumulative shifts after hours of continuous homing or index adjustments, leading to rejected parts. fanuc parameter 1860

In Fanuc technical lore, Parameter 1860 is often seen as a "ghost" value. It represents the —a raw, digital count that tracks every rotation of the motor even when the power is off. While operators usually focus on Parameter 1815 (which actually sets the home bit), 1860 is the underlying data that makes that home bit meaningful. The Re-Homing Ritual

The reference point values stored in 1860 and 1861 ensure that the rotary axis maintains absolute position tracking, which is critical for coordinated multi-axis movement.

To understand Parameter 1860, it helps to look at , which manages the absolute position detector setup. Parameter 1815 includes crucial bits such as: The moment 1815

Other related parameters include:

Set to 1 to enable the absolute pulse coder system.

| Phase | Speed Control | Parameter | Description | |-------|---------------|-----------|-------------| | | Rapid traverse (G00) | 1420, 1421, 1422, 1423 | Axis moves toward the deceleration dog at rapid speed. | | 2. Low-Speed Search | Parameter 1860 | PRM 1860 | After hitting the dog, axis decelerates to this speed to find the 1-grid signal (encoder marker pulse). | | 3. Final Stop | N/A (control logic) | N/A | Axis stops at exact reference position (grid point). | It's essential to understand which of these roles

Parameter 1860 rarely works in isolation. It is part of the acceleration/deceleration profile. You may also need to check:

Key in the designated value according to your machine tool builder's documentation (typically 1 for standard absolute serial encoders). Press the softkey. Step 4: Power Cycle the Machine

If you change Parameter 1860, always verify the status of Parameter 1815 right next to it to ensure your zero points remain valid.

Under normal operating conditions, this parameter is set at the factory and never touched. However, specific maintenance and repair scenarios will alter the relationship between the motor encoder and the physical machine position.