Press the function key and then select the PARAM softkey.
: The position detector is an incremental pulse coder (or the absolute pulse coder is being used as an incremental one). 1 : The position detector is an absolute pulse coder. Why This Matters
It is an axis-specific parameter used by the CNC to track the physical location of each axis even when power is removed, provided the backup battery is functional. 🛠️ Key Functionality
These detectors count pulses relative to a starting point. When you turn off the machine, the position is lost. Upon power-up, the operator must perform a manual reference position return (G28 or homing sequence) to tell the machine where "zero" is. fanuc parameter 1860
This occurs if you changed 1860 or 1815 and the machine needs you to manually reset the absolute zero point. You must move the axis to the physical home position and flip Parameter 1815 Bit 4 (APZ) to establish home.
A major operational implication exists when this parameter is set: the machine position and the position on the absolute position detector become uncorrelated. Consequently, parameter APZ (No.1815#4) is automatically set to 0, generating alarm DS0300.
Understanding parameter 1860 requires familiarity with several closely associated parameters: Press the function key and then select the PARAM softkey
Key in the designated value according to your machine tool builder's documentation (typically 1 for standard absolute serial encoders). Press the softkey. Step 4: Power Cycle the Machine
Fanuc Parameter 1860 is the digital servo parameter used to set the feedback pulse count for an absolute motor encoder. It tells the CNC control how many pulses represent one full revolution of the motor. This setting is critical for maintaining accurate position data, especially after a battery failure or motor replacement. The Role of Parameter 1860
: If the 3V or 6V backup batteries on the servo amplifier die while the CNC is powered off, the absolute encoder loses its multi-turn memory. When power is restored, the machine generates a 300 APC Alarm: Need ZRN (Zero Return Required). Re-establishing the home position recalculates and rewrites Parameter 1860. Why This Matters It is an axis-specific parameter
This guide provides a detailed look at parameter 1860, how to configure it, and when to adjust it for optimal machine performance. 1. What is FANUC Parameter 1860?
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Are you trying to (like an APC or servo error) or adjust accuracy ? Which Fanuc series is it? (16i, 18i, 21i-T/M etc.)
What prompted you to look into Parameter 1860?
Maintain a log of all parameter changes, including: