Fanuc Parameter 1860 Work May 2026

This parameter is critical for protecting tools and parts during:

Fanuc Parameter 1860 (labeled as APRS) is a critical setting used to establish the reference position (home position) for axes equipped with absolute encoders. It functions by signaling to the CNC whether the reference position for a specific axis has been successfully established and "remembered" by the control system. How Parameter 1860 Works

Establishment Status: When bit 4 of parameter 1860 (APRS) is set to 1, it indicates that the reference position for that axis has been established. If it is 0, the CNC does not know the absolute machine position and will typically require a "homing" or reference return procedure. fanuc parameter 1860 work

Absolute Encoders: This parameter is primary for machines using absolute pulse coders. Unlike incremental encoders, these coders keep track of the position even when the machine is powered off (often via battery backup). Parameter 1860 acts as the internal "checkmark" that the position stored in the encoder is valid and synced with the CNC's machine coordinate system.

Homing Procedure: If a machine loses its position (e.g., due to a dead battery or disconnected motor), parameter 1860 will automatically flip to 0. To "work" the parameter back to 1, the operator must perform a manual reference position return or set the position manually, after which the control updates this bit to confirm the axis is now "homed." Related Parameters This parameter is critical for protecting tools and

To properly configure or troubleshoot axis homing, you often need to look at the "1800-series" group of parameters:

1815 (APC/APZ): Works in tandem with 1860. Bit 5 (APC) tells the CNC an absolute encoder is being used, and bit 4 (APZ) is the actual "Zero" position indicator. 1850: Sets the reference position offset value. fanuc parameter 1860 work

1851/1852: Used for backlash compensation (slow/fast) once the reference position is set. Maintenance Tip

If you encounter a 300 APC Alarm (Request for Reference Position Return), check parameter 1860. If the APRS bit is 0, the CNC has "forgotten" where it is. You will need to enable Parameter Write (PWE) and perform the homing procedure specified by your machine tool builder to reset it.

Are you currently troubleshooting a position error or setting up a new axis on your Fanuc control? How to Enable Parameter Write Enable (PWE) on a Fanuc CNC

No. Parameter 1861 is often the standard orientation shift (static offset), while 1860 is the synchronous error compensation. Changing 1861 without also checking 1860 will not fix rigid tapping issues—only orientation. Always verify both.