Because rapid traverse rates are significantly faster than cutting feedrates, the value in Parameter 1860 is almost always set much higher than the value in Parameter 1828 to accommodate the natural lag caused by high-speed acceleration. Data Structure and Input Specifications
Type 1860 using the alphanumeric keypad, then press the (Number Search) softkey.
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
function to read real-time axis positioning for external monitoring software. Critical Maintenance Procedures fanuc parameter 1860 full
Understanding FANUC Parameter 1860: The Complete Guide to Rotation Axis Position Updating
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.
: In machines without counterweights, a spindle may droop during an E-stop before the brake engages. Parameter 1860 will record this displacement, which can lead to slight discrepancies in homing if not accounted for. Zeroing Procedure Because rapid traverse rates are significantly faster than
On FANUC 16i, 18i, 21i, 0i-C, 0i-D, and 0i-F series controls, this parameter tells the CNC software exactly how many position feedback pulses (counts) are generated by the feedback device for every single revolution of the servomotor. The Role of Feedback Counts
Older controls (Fanuc 6, 10, 11, 12, 15) use different parameter numbering. For example, on Fanuc 15, the reference shift might be Parameter 700+ (axis-specific). Check your yellow Fanuc manual.
Based on real-world field experience from CNCzone, the documented reset process that includes Parameter 1860 is as follows: Servo parameters require a full power cycle to
If your machine is constantly tripping a alarm during rapid movements, Parameter 1860 is flagging a genuine system failure. While you can temporarily increase the value in Parameter 1860 to diagnose the issue, the root cause is rarely the parameter itself. Look for these common mechanical and electrical issues: 1. Mechanical Binding or Heavy Friction
Type using the keypad and press the [No. SRH] (Number Search) soft key.
For servo parameters like 1860 to fully initialize in the servo software loop, turn off the main CNC control power, wait 30 seconds, and turn it back on. Troubleshooting SV0411 Alarms Linked to Parameter 1860
Unit conversion: If parameter 1820 = 100 (0.1 µm/unit), then 1000 units = 0.1 mm.
. This parameter is part of the axis-specific settings (1800-series) and is critical for maintaining machine coordinates without needing a reference return (homing) every time the power is cycled. Key Function & Usage