Sarah began the delicate process of "teaching" the machine its home again:
You should never treat Parameter 1860 as a "tuning" parameter. Its primary role in modern FANUC controls is as a storage location for reference point data calculated by the system. Changing it arbitrarily can disrupt the absolute positioning system, leading to machine crashes. The correct method is to follow the absolute positioning setup procedure and let the system update it automatically.
| Parameter | Function | |---|---| | | Dual position feedback maximum amplitude in some models; paired with parameter 1860 for reference point preservation in rotary axes | | 1815#4 (APZ) | Indicates whether correspondence between machine position and absolute position detector is established; set to 0 when parameter 1860/1861 are modified | | 1815#5 (APC) | Enables/disables absolute position detector function; cleared when re-establishing reference points | | 1851 | Standard backlash compensation amount for cutting feed (most common backlash parameter) | | 1852 | Fast (rapid traverse) backlash compensation amount | | 1260 | Defines the shift value per rotation (rounding value) used when determining whether to renew reference point data |
Cycle the power; the CNC will now write the new position into .
Whether you are a service engineer, a maintenance technician, or a CNC machinist looking to understand your machine better, this post explains what this parameter does, why it matters, and how to troubleshoot issues related to it.
Mastering FANUC Parameter 1860: The Complete Guide to Position Feedback and Absolute Encoders fanuc parameter 1860
To help tailor this information to your specific problem, could you provide a bit more context? Let me know: What are you working on?
She felt a chill that had nothing to do with the air conditioning.
: Specifies whether the position detector is an absolute pulse coder (similar to 1860, but handles the communication handshake).
: Unlike incremental encoders that require a fresh "Zero Return" ( G28cap G 28
If you disconnect a motor, replace a ballscrew, or move the axis manually while the power is off, the value in 1860 will no longer match the physical reality. Sarah began the delicate process of "teaching" the
What of FANUC control are you working on (e.g., 0i-D, 18i-T, 31i)?
Parameter 1860 is not a single-purpose setting; its function changes based on the capabilities of your CNC control. The most common definitions are:
For changes to Parameter 1860 to take physical effect in the servo system, you must (Cycle Power). Summary of Best Practices
Uncoupling the motor from the ball screw inevitably shifts the physical grid point.
: When a technician performs a zero-return or resets the absolute position (often by toggling the APZ bit in Parameter 1815), the system recalibrates the relationship between the machine's physical "home" and the count currently residing in Parameter 1860. Why Parameter 1860 Matters The correct method is to follow the absolute
“It’s just a parameter,” Gary said, for the fourth time. “You’re the expert.”
By correctly maintaining Parameter 1860 and your servo amplifier batteries, you can eliminate the tedious task of homing your CNC machine every morning, saving valuable production time and protecting your tooling setups.
FANUC parameter 1860 is a critical setting in the FANUC CNC system that controls the External Machine Stop function. By understanding the significance of this parameter and how to set it correctly, users can ensure the safe and efficient operation of their machines. Whether you're a seasoned CNC programmer or a newcomer to the world of CNC machining, this article has provided you with a comprehensive guide to FANUC parameter 1860. By applying the knowledge gained from this article, you can optimize your machine's performance, improve safety, and reduce downtime.
If you change Parameter 1860, always verify the status of Parameter 1815 right next to it to ensure your zero points remain valid.