Fanuc Parameter 1860 Full [hot] Jun 2026

Parameter 1860 is likely too low. The acceleration isn't fast enough to keep up with the rapid reversal.

Parameter 1860 is used by the CNC control to track the physical location of an axis even when the power is turned off, provided the machine is equipped with absolute encoders and battery backup. Homing & Synchronization

Photograph the parameter screen for 1860, 1850, 1851, and 1815 (APC/APZ settings). fanuc parameter 1860 full

The relationship between time constant (T) and acceleration (a) is:

Decrease 1860 gradually (5 ms at a time) until corners sharpen and cycle time improves, but before vibration appears. Parameter 1860 is likely too low

Therefore, you would to the existing Parameter 1860.

In Fanuc CNC systems, Parameter 1860 is a read-only axis parameter that stores the current position of the absolute position detector (absolute encoder). It is often referred to as the current position in the absolute detector or the "encoder count". Technical Overview Homing & Synchronization Photograph the parameter screen for

A common confusion exists among Fanuc parameters. Here is the breakdown:

Fanuc Parameter 1860 stores the absolute encoder pulse count for each axis, which is crucial for resolving 300 APC alarms caused by lost positional data, often due to dead batteries. Fixing the alarm involves replacing the batteries, setting Parameter 1815 (bit 4) to 1, and re-establishing the physical home position to automatically update Parameter 1860. For detailed instructions, you can read the Practical Machinist discussion and CNCmakers technical support . CNC Fanuc Resetting home position After switching batteries