Setting the machine zero is a two-step dance involving Parameters 1815 and 1860:
To refresh the data in Parameter 1860, follow the (often referred to as "homing the absolute axis"): Set Parameter 1815 bit 4 (APZ) to 0 for the specific axis. Restart the machine (this clears the old position). Manually move the axis to the desired "Home" position. Set Parameter 1815 bit 4 (APZ) back to 1 .
Defines the precise coordinate value used for rotational rounding offsets.
If you change Parameter 1860, always verify the status of Parameter 1815 right next to it to ensure your zero points remain valid. fanuc parameter 1860
In the Fanuc ecosystem, specifically for Alpha and Beta series servo motors, Parameter 1860 works in tandem with the Absolute Pulse Coder (APC). While Parameter 1815 bit 5 (APC) enables the absolute position function, Parameter 1860 defines the resolution of that position. Standard values often depend on the specific encoder type: Most modern Alpha i encoders use a value of 1,000,000. Older models may require values like 8,192 or 65,536.
On FANUC CNC controls (such as the Series 0i, 16i, 18i, 21i, and 30i/31i/32i models), defines the Grid Position Shift Amount for each axis.
Together, these parameters form an integrated system for maintaining position accuracy, managing reference points, and compensating for mechanical backlash. Setting the machine zero is a two-step dance
Before making any modifications, ensure you have a complete backup of all CNC parameters. This allows quick restoration if problems arise.
On a standard rotary axis (like a C-axis or A-axis table), passing the 0-degree point can alter how position registers refresh.
is toggled from 0 to 1 (or resets automatically after a manual reference return cycle, depending on the FANUC series) to lock in the home coordinates. Common Alarms Related to Parameter 1860 Set Parameter 1815 bit 4 (APZ) back to 1
While users often interact with Parameter 1815 to set home positions, Parameter 1860 is the "under the hood" value that the CNC uses to track the physical location of each axis using an absolute encoder.
Every CNC machine leaves the factory with a printed parameter data sheet inside the electrical cabinet. Always cross-reference your current 1860 values with this original document.
The reference position (Parameter No. 1860/1861) is not updated during homing. 2. When to Change Parameter 1860
Other related parameters include:
In CNC systems (specifically Series 16i, 18i, 21i, and 0i), Parameter 1860 is a critical, axis-specific value that stores the absolute position encoder data .