Parameter 1860 is not a "set once and forget" value. You may need to adjust it during:
If you are setting up a new axis:
Disclaimer: This guide is for educational purposes. Always consult the specific Fanuc Parameter Manual for your specific control model (Series 16i/18i/21i/30i/31i/32i) and contact your machine tool builder's service department before modifying system parameters.
Fanuc Parameter 1860 is a critical coordinate system setting that manages the relationship between the machine’s mechanical zero and its absolute position detection system. This parameter is specifically used on machines equipped with absolute pulse coders (APCs) to ensure the control always knows exactly where the tool is, even after a power cycle. Core Function and Purpose
Parameter 1860, along with its counterpart Parameter 1861, defines the reference position for each axis. When an absolute encoder is used, the CNC must know the offset between the encoder's "internal zero" and the physical machine zero.
Coordinate Alignment: It tells the CNC how to calculate the machine coordinate value from the pulse data provided by the absolute encoder.
Reference Return (Zero Return): Unlike incremental systems that require a physical trip to a limit switch (homing) every morning, systems using Parameter 1860 "remember" their position. This parameter stores the necessary data to maintain that reference. How Parameter 1860 Works in Practice
In most modern Fanuc controls (such as the 0i, 16i, 18i, and 21i series), the process of setting this parameter is often automated during a zero-point establishment procedure.
Detection System: For this parameter to be active, Parameter 1815 #5 (APC) must be set to 1 (indicating an absolute pulse coder is in use). fanuc parameter 1860 work
Home Position Setup: When you perform a manual zero return to set the home position, the CNC calculates the difference between the current encoder reading and the desired machine zero.
Automatic Update: Once the APZ (Parameter 1815 #4) bit is toggled to 1 following a restart, the CNC often updates 1860/1861 automatically to reflect the precise physical location of the axis. Troubleshooting and Maintenance
If your machine loses its home position (common after a battery failure or encoder replacement), you will likely see a 300 APC Alarm. To fix this:
Enable Parameter Writing: You must set PWE (Parameter Write Enable) to 1 on the SETTING screen to make changes.
Manual Adjustment: While usually updated by the system, technicians may manually adjust Parameter 1860 to "shift" the machine zero without physically moving the encoder or motor.
Scale Synchronization: On axes with separate linear scales that do not hold rotation data, Parameter 1815 #6 (NRT) determines if the reference position is updated when coordinates pass the value stored in 1860. Related Parameters for Work Offsets
While 1860 handles the machine's "foundation" coordinates, operators use different tools for daily job setups:
G54–G59: These work coordinate systems (WCS) are offsets relative to the machine zero established by 1860. Parameter 1860 is not a "set once and forget" value
Parameter 1201–1202: Often used for manual absolute settings that affect how the absolute position display behaves during tool changes or G43 height compensations.
Master the Fanuc Zero Return Procedure in 5 Steps - CNCFixtech
To truly understand how Parameter 1860 works, you need to look at three key areas:
In the realm of Computer Numerical Control (CNC) machining, the precision of axis movement is paramount. FANUC controls, renowned for their robustness, rely on a complex architecture of parameters to define machine behavior. Among these, Parameter 1860 stands as a cornerstone for the accurate setup of servo motor feedback systems. This parameter is not merely a number; it is the digital "signature" that aligns the CNC’s electronic commands with the physical reality of the motor’s rotation.
FANUC Parameter 1860 is a precise and powerful tool that bridges the digital command of the CNC with the analog reality of mechanical motion. While it may be overshadowed by more commonly discussed parameters, its correct configuration is the bedrock of accurate axis scaling, consistent homing, and safe operation. For any service engineer or machinist facing unexpected axis movement errors, verifying the value of Parameter 1860 against the specifications of the installed pulse coder is an essential diagnostic step. In the high-stakes world of precision machining, this single parameter ensures that a command to move one inch results in exactly one inch of movement—no more, no less.
Here’s a concise review for Fanuc Parameter 1860 related to “work” (typically workpiece handling or robotic hand control):
Review: Fanuc Parameter 1860 (Work / Hand Control)
⭐ 4.8/5 – Essential for end-of-arm tooling & workpiece management Disclaimer: This guide is for educational purposes
Overview:
Parameter 1860 in Fanuc controls the hand number or workpiece handling configuration (often used in conjunction with hand control logic or work clamping). It’s critical for robots and machining centers that manage multiple grippers or part types.
Pros:
Cons:
Best for:
Tip: Always verify 1860’s value against your workpiece definition table (often param 1861–1865). Back up your PMC parameters before editing.
Would you like a sample ladder logic snippet or a safety checklist for changing this parameter?
| Parameter Number | Data Type | Unit | Valid Range | | :--- | :--- | :--- | :--- | | 1860 | Word Integer (2-byte) | Percentage (%) | 0 – 100 (or higher depending on specific Fanuc Series/Option) |
The control needs to know how much distance equals "one count" (pulse).
Scenario B: Linear Scales (Separate Detectors) If the machine has linear scales (glass scales) mounted on the axis itself: