Fanuc Parameter 1860 ((hot)) Full Direct
Turn off the main breaker of the CNC machine, wait 30 seconds, and turn it back on. Servo parameters require a full power cycle to initialize in the CNC RAM. Troubleshooting Related Alarms
FANUC provides the control components, but the machine builder defines the safe physical operating limits based on the mass of the castings and the strength of the ballscrews. Always refer to the specific builder's manual for recommended baseline settings.
On many newer Fanuc controls (0i, 31i, 32i), Parameter 1860 is specifically for the reference position.
Parameter 1860 is defined as a bit-type or axis-specific variable depending on the exact generation of your FANUC control system (such as the Series 0i, 16i, 18i, or 31i). Its primary behavior centers around the or reference point updating logic. The Core Setting Logic fanuc parameter 1860 full
Some operators shift Z-axis zero (Parameter 1860) slightly positive to gain extra clearance for a large drill or boring bar, though this is dangerous and not recommended for production.
Since 1 unit = 0.001 mm: 5.000 mm / 0.001 mm per unit = 5000 units
If the servo drive cannot supply enough current or voltage to the motor during high-speed acceleration, the motor torque drops. Without adequate torque, the motor lags behind the commanded speed curve, violating Parameter 1860. Check the LED diagnostic displays on your FANUC servo amplifier modules in the electrical cabinet. 4. Incorrect Servo Tuning (Gain Parameters) Turn off the main breaker of the CNC
| Method | When to Use | Risk Level | | :--- | :--- | :--- | | | After replacing a limit switch or deceleration dog. | Medium | | Reference Position Shift (1860) | After replacing absolute encoder or battery. | High | | Work Shift (G54-G59) | Daily part setup. No permanent machine change. | Low | | External Offset | Temporary tool length changes. | Low |
If you are setting up absolute encoders on your FANUC control, you will need to go through a specific procedure to correctly set Parameter 1860. This is not something you type in manually; it is generated by the CNC.
In modern Fanuc systems—including the Fanuc Series 0i-F , 16i, 18i, 21i, and 30i models—Parameter 1860 holds the relationship data between the machine's reference physical coordinates and the underlying internal counter value of the absolute encoder. Data Attribute Specifications 1860 (Value 1 for Absolute Position Detector Zero Point) Input Type Locked / System-Calculated Parameter Data Type 2-word axis (Long Integer) Companion Settings Parameter 1861 (Value 2), Parameter 1862 (Value 3) The "Do Not Touch" Rule Always refer to the specific builder's manual for
Here haven't found any official source stating that Fanuc Parameter 1860 is "Full" or related to memory capacity. Fanuc Parameter 1860 is typically related to .
A smaller 1860 value means faster acceleration/deceleration (sharper moves). A larger value means gentler, slower ramping.
If you have searched for , you are likely trying to understand its purpose, how to set it correctly, or perhaps troubleshooting a machine that has suddenly lost its zero position. This article provides a complete, deep-dive explanation of Parameter 1860 – what it is, how it works, how to calculate the "full" value, and the critical safety steps you must take before editing it.