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FANUC parameter 1860 is a specific setting within the FANUC control system that relates to the machine's operation and performance. This parameter is part of a larger system of parameters that allow users to customize and fine-tune the CNC machine's behavior. Parameter 1860, in particular, is associated with the "High-speed machining" or "Advanced preview" function.
When executing a coordinate calibration or recovering from an absolute pulse coder battery failure, Parameter 1860 bridges the gap between the machine's absolute electrical grid and its actual physical alignment. Parameter Technical Overview : 1860 Data Type : Two-word axis (Long Integer) Valid Range : -99999999 to 99999999 Default Value : 0
This is why you should generally attempt to calculate or manually input values into 1860. It is a "system" parameter. If you are troubleshooting a "Zero Lost" alarm (APC alarm), the solution is to re-zero the axis, not to hack the value.
Indicates if the reference position (zero point) is established. If it is 0, a 300 APC alarm occurs. fanuc parameter 1860 full
Before making changes, perform a full parameter backup to an SRAM card or USB stick.
The formula used to determine Parameter 1860 for full-closed loops is:
When you execute G28 X... Y... Z... , the reference point return occurs in : FANUC parameter 1860 is a specific setting within
Press the function key and change Parameter Write Enable (PWE) to 1 . Press the [SYSTEM] key, then the [PARAMETER] softkey. Type 1860 and press [NO. SRH] . Locate the axis you wish to change (X, Y, Z, etc.). Input the new value and press [INPUT] .
If you are working with a rotary axis (A type) that uses a rotary scale without revolution data (such as certain Heidenhain or Futaba scales), the logic changes. Here, Parameter 1860 is linked to Bit 1815 (RONx).
Some control models include Parameter 1860 as a when a two-speed gearbox is present on the axis drive. This is particularly true for older 18MC controls where parameters 1853, 1855, 1856, 1860, 1861, and 1865 are listed in the same axis format but standard manuals skip to 1870. In those legacy systems, 1860 can store one of the gear ratio numerator/denominator pairs. When executing a coordinate calibration or recovering from
While you cannot "manually" set Parameter 1860 to a specific number to fix a machine, observing it is a powerful diagnostic tool.
While overlooked by many, Parameter 1860 is key to the machine's "memory" of where it is in space. This guide explains what this parameter does, its different functions in various FANUC systems, and the correct procedures for setting it up to ensure your machine establishes its reference points quickly and consistently.
This article provides a comprehensive breakdown of FANUC Parameter 1860, explaining its function, how it interacts with the control system, and how to configure it correctly. What is FANUC Parameter 1860?
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