When you encounter issues with a or losing position after power cycles, inspect Parameter 1860 and 1861 together with Parameter 1815.0 (NRT). Never change them arbitrarily—always document the original values first. Incorrect settings here can lead to reference position drift or unexpected coordinate jumps.
By following this guide, you can confidently adjust Fanuc Parameter 1860, recover from a lost zero, and keep your CNC machining center running with original factory precision. Remember: The parameter itself never crashes the machine – only the incorrect value typed by the user does. When in doubt, revert to zero and call a professional.
When the absolute pulse coder battery dies completely while the machine is unpowered, the internal encoder count resets to zero. Upon restart, the system flags a synchronization alarm because the physical state of the axis no longer correlates with the reference string stored inside Parameter 1860. 2. Physical Axis Crash or Disconnection
Locate the parameter and change it from 0 to 1 . Ignore the standard PWE warning alarm. Phase 2: Cycle the APZ Bit Press the SYSTEM hard key, then select the PARAM soft key. Search for Parameter 1815 . Find the axis you need to adjust and look at Bit 4 (APZ) . Set APZ to 0 . fanuc parameter 1860 full
This article is for informational purposes. Always refer to your specific Fanuc control manual and machine builder guidelines before modifying CNC parameters. Machine tools can cause severe injury or death if misused.
The absolute reference position has not been established yet for that axis.
-axis home position is reset, the value in 1860 changes, which may require you to re-verify the tool change height stored in Parameter 1241 en.industryarena.com How to View/Set Enable Writing : In MDI mode, go to the screen and set PARAMETER WRITE = 1 : Press the hard key, then the to locate the parameter for each axis. When you encounter issues with a or losing
: In standard procedures, manually performing a reference return after setting 1815.4 to '0' will cause the CNC to automatically update the value in Parameter 1860 and then flip 1815.4 back to '1'. How to Set or Reset Parameter 1860
Essential for systems using incremental or absolute pulse coders where the "Grid Method" is used for zero return. Why Adjust Parameter 1860?
Note: In newer FANUC controls (31i-B, 0i-F), parameter 1860 is often replaced or augmented by (grid check tolerance), but 1860 remains active for legacy mode or specific axis setups. By following this guide, you can confidently adjust
If you encounter an absolute pulse coder alarm (like Alarm 300), you must re-establish the reference position. Simply typing "1" into Parameter 1860 is usually not enough; the CNC must "see" the machine reach its physical home first. Step-by-Step Recovery Procedure: How to Enable Parameter Write Enable (PWE) on a Fanuc CNC
. This value represents the amount of shift required to align the absolute encoder's internal reading with the machine's actual reference position. Key Functions & Characteristics