FANUC Parameter 1860 is a critical axis-specific parameter used to store the absolute position data (machine coordinate) of an axis equipped with an absolute pulse coder (APC).
When a machine is equipped with absolute encoders, it does not need to be homed every time it is powered on because the CNC "remembers" the current position by reading the value stored in this parameter. Core Function and Mechanics
Data Storage: This parameter holds the current machine coordinate value for each axis. When you power off the machine, the encoder's battery keeps the internal pulse count active. Upon restart, the CNC compares the encoder's data with the value in Parameter 1860 to re-establish the absolute position without physical movement. Interaction with Parameter 1815:
Bit 5 (APC): If set to 1, the CNC knows the axis has an absolute encoder.
Bit 4 (APZ): This is the "Reference Position Established" flag. When this bit is 1, the CNC considers the value in Parameter 1860 to be valid and synchronized with the physical machine position. When Does It Change?
Automatic Updates: During normal operation, the CNC constantly updates this value as the axis moves.
Homing/Zero Return: When you perform a manual reference position return, the system sets the current physical position as the "zero" point and updates Parameter 1860 accordingly while flipping 1815#4 (APZ) to 1.
Loss of Position: If the encoder battery dies or the encoder is disconnected, the system loses the synchronization between the mechanical position and Parameter 1860. This triggers a 300 APC Alarm, requiring you to re-set the reference position. Setting or Resetting Procedure
If you lose your home position (e.g., after a battery failure), you must re-synchronize Parameter 1860. You can find detailed technical guidance in the official PARAMETER MANUAL. A typical reset involves: Enabling Parameter Write (PWE = 1).
Setting Parameter 1815 Bit 4 (APZ) to 0 for the specific axis.
Jogging the axis to the physical home position (often marked on the machine). Setting Parameter 1815 Bit 4 (APZ) back to 1.
Powering the machine off and back on to finalize the new position in Parameter 1860.
Important Safety Note: Because Parameter 1860 defines where the machine "thinks" it is, an incorrect value can cause soft overtravel alarms (e.g., Alarms 500 or 501) or, worse, a physical crash. Always verify your coordinates after modifying this parameter.
Are you currently dealing with a 300 APC Alarm on a specific axis? How to Enable Parameter Write Enable (PWE) on a Fanuc CNC
Understanding FANUC Parameter 1860: A Comprehensive Guide
FANUC, a renowned Japanese company, is a leading manufacturer of industrial robots, CNC systems, and other automation solutions. Their products are widely used in various industries, including manufacturing, automotive, and aerospace. In this article, we'll focus on FANUC parameter 1860, a specific setting that plays a crucial role in the proper functioning of FANUC CNC systems.
What is FANUC Parameter 1860?
FANUC parameter 1860 is a setting that determines the scaling factor for the second reference velocity in a FANUC CNC system. This parameter is used to adjust the speed of the machine tool's movement along a specific axis. The value set for parameter 1860 directly affects the machine's performance, accuracy, and overall efficiency.
Why is FANUC Parameter 1860 Important?
Proper setting of parameter 1860 is essential for several reasons:
How to Set FANUC Parameter 1860
Setting parameter 1860 requires a thorough understanding of the machine's specifications, the type of movement, and the desired performance. Here are the general steps to follow:
Troubleshooting and Best Practices
To ensure optimal performance and accuracy, follow these best practices:
Conclusion
FANUC parameter 1860 plays a vital role in the proper functioning of FANUC CNC systems. Understanding the significance of this parameter and setting it correctly is essential for ensuring machine accuracy, performance, and safety. By following the guidelines outlined in this article and consulting FANUC's documentation, machine operators and technicians can optimize parameter 1860 and achieve optimal results from their FANUC CNC systems. fanuc parameter 1860 work
Understanding Fanuc Parameter 1860: Reference Position and Absolute Encoders
Fanuc Parameter 1860 stores the absolute position of an axis within the current rotation of the encoder. It is a critical, read-only system parameter used by the CNC to track exactly where an axis is relative to its reference (home) position. If the value in Parameter 1860 is lost or incorrect—often due to a battery failure—the machine will lose its "sense" of where it is, leading to homing alarms. What is the Function of Parameter 1860?
In Fanuc CNC systems, Parameter 1860 acts as the machine's memory for axis position data when using absolute pulse coders (APC). Unlike incremental encoders, which must hit a "limit switch" or "dog" every time the machine starts up, absolute encoders always know their position.
Role in Homing: When an axis is successfully homed (set with Parameter 1815.4 APZ), the current encoder count is saved into Parameter 1860.
Data Type: It typically uses modular arithmetic, meaning the value "wraps around" based on the encoder's pulses per revolution.
Reference Completion: If the system detects a discrepancy between the physical position and the value in 1860, it may trigger a "Request for Reference Position Return". How Parameter 1860 Works During Startup
When you power on a Fanuc machine equipped with absolute encoders:
Verification: The CNC reads the current value from the encoder.
Comparison: It compares this value against the stored data in Parameter 1860.
Validation: If they match within a certain tolerance, the machine "remembers" its position immediately without requiring a manual zero return. Troubleshooting Common 1860 Issues
Most issues related to Parameter 1860 arise after a battery failure or motor replacement.
Alarms 300-349 (APC Alarms): These indicate that the absolute position data has been lost.
Reference Position Incomplete: If you reset Parameter 1815 but the machine doesn't move to the correct spot, the value in 1860 will often change automatically once a new reference point is established.
Soft Overtravel Alarms: If the stored position in 1860 suggests the machine is outside its travel limits upon startup, you may need to power on while holding "P" and "CAN" (Cancel) to bypass the check and re-home the axis. Step-by-Step: Setting the Reference Position
Because Parameter 1860 is a system-generated value, you do not "type in" a value manually. Instead, you perform a procedure to let the CNC update it:
Master the Fanuc Zero Return Procedure in 5 Steps - CNCFixtech
In FANUC CNC systems, Parameter 1860 specifically used to define the current absolute position of an axis when using an absolute pulse coder
. It is not typically referred to as a "work" parameter in a general sense, but rather a "reference position" or "absolute position" setting. Key Details of Parameter 1860 It stores the absolute position of each axis. Relationship with APC: APC (Absolute Position Coder)
bit in Parameter 1815 is set to 1, the system uses Parameter 1860 to track where the machine is, even after power is turned off.
You generally do not manually edit this parameter under normal "work" conditions. Instead, it is automatically updated by the CNC after a successful Reference Point Return or home position setting procedure. When You Might Use It
If you are seeing a "review" or discussion about "Parameter 1860 work," it likely refers to one of the following maintenance tasks: Setting Home Position:
After replacing an absolute encoder battery or a motor, you must "zero" the machine. Setting the APZ bit (in Parameter 1815) often triggers an update to the value stored in 1860. Synchronizing Positions:
If there is a mismatch between the physical position of the tool and what the screen shows, technicians may verify the value in 1860 to ensure the absolute pulse coder is communicating correctly. Troubleshooting Alarms: Alarms like APC Alarm 300
(Request for Reference Position Return) often involve verifying that the system is correctly writing data to Parameter 1860. MRO Electric Important Related Parameters Parameter 1815:
Used to enable absolute position detection (APC bit) and confirm that the zero point has been set (APZ bit). Parameter 1850: Sets the reference point offset. Parameter 1241: FANUC Parameter 1860 is a critical axis-specific parameter
Defines the coordinate value of the second reference point (often used for tool changes). MRO Electric Enable Parameter Write (PWE)
and back up your current settings before attempting to modify axis position data. Machine Metrics Are you currently facing a specific alarm code or trying to reset the home position on a machine? How to Enable Parameter Write Enable (PWE) on a Fanuc CNC
Review: Understanding and Working with FANUC Parameter 1860
Introduction
FANUC is a leading manufacturer of CNC (Computer Numerical Control) systems, and their parameters play a crucial role in customizing and optimizing machine tool performance. Parameter 1860 is one such setting that holds significant importance in certain machining applications. This review aims to provide an in-depth understanding of FANUC parameter 1860, its functions, and how to work with it.
What is FANUC Parameter 1860?
Parameter 1860 is a specific setting in FANUC CNC systems that relates to the "Scaling function" or "Axis scaling" for a particular axis. It allows users to adjust the movement of a specific axis by scaling the command value. This parameter is especially useful in applications where the machine tool requires non-linear movement or where a specific axis needs to be adjusted to compensate for mechanical inaccuracies.
Functions of Parameter 1860
The primary function of parameter 1860 is to enable and set the scaling ratio for a specific axis. By adjusting this parameter, users can:
Working with Parameter 1860
To work with parameter 1860, follow these general steps:
Best Practices and Precautions
When working with parameter 1860, keep in mind:
Conclusion
FANUC parameter 1860 is a powerful tool for customizing and optimizing machine tool performance. By understanding its functions and following best practices, users can effectively utilize this parameter to achieve specific machining requirements. However, it is essential to approach parameter changes with caution and thoroughly test and validate any modifications to ensure safe and accurate machine tool operation.
Parameter 1860 a crucial axis-specific setting used to define the
position of each servo axis on the FSSB (Fanuc Serial Servo Bus) when using manual configuration
. It essentially tells the CNC control which physical amplifier and slave unit corresponds to which logical axis (like X, Y, or Z). How it Works
In modern Fanuc systems (like the 16i, 18i, 21i, and 0i series), the control communicates with servo amplifiers through a high-speed fiber-optic bus called Automatic vs. Manual
: Most machines use "Automatic Setting" (set via Parameter 1902), where the system detects the amplifiers in order. The Role of 1860
: When manual setting is required—often for complex configurations or when adding axes—Parameter 1860 is used to assign a specific Slave Number to each axis.
: The value entered in 1860 for a particular axis typically represents the hardware address or "slave" position on the FSSB string. Why It’s "Interesting" Invisible in Standard Manuals
: Because it is an advanced FSSB configuration parameter, it often does not appear in the standard "Backlash" or "Travel Limit" sections of the Practical Machinist threads or basic parameter manuals. Ghost Axes
: If 1860 is set incorrectly, the machine might "see" an axis that isn't there or fail to communicate with a real one, leading to FSSB-related alarms (like System Alarm 920 or 926). Initialization
: When setting up a machine from scratch, changing 1860 usually requires a power cycle Machine Accuracy : An incorrect value for parameter
to take effect because the FSSB must re-initialize its entire communication handshake. Related Parameters : Used to set the servo axis number. : Controls whether the FSSB is in automatic or manual mode. : Frequently mentioned nearby in forums, these handle Backlash Compensation for each axis. Further Exploration Learn how to troubleshoot FSSB alarms by reading the FSSB Configuration Guide
Discover why Parameter 1860 is often omitted from standard manuals in this Practical Machinist discussion
Step-by-step instructions for manual FSSB initialization can be found at Are you trying to add a new axis to your machine, or are you troubleshooting a specific FSSB alarm PARAMETER MANUAL
In the world of FANUC CNC controls, Parameter 1860 serves a vital role in establishing and maintaining the machine's coordinate system. Specifically, it stores the current position of the absolute encoder for each axis in relation to the machine’s reference (home) point. 🛠️ What Parameter 1860 Does
On machines equipped with absolute encoders, Parameter 1860 acts as a "memory bank." It records the distance from the machine's zero point to the current absolute position. This allows the machine to "remember" exactly where it is, even after the power is turned off.
Axis-Specific: This is an axis-type parameter, meaning it has a unique value for X, Y, Z, and any additional axes.
Unit of Measure: Data is usually stored in detection units (the smallest increment the encoder can see), such as 0.001mm or 0.0001 inches.
Automatic Updates: Under normal operation, the control updates this value automatically as the axis moves. ⚠️ Common Scenarios & "Work" Involved
You rarely need to touch Parameter 1860 manually unless there is a communication or hardware failure. "Work" involving this parameter typically occurs in these situations: 1. Battery Failure (APC Alarm)
If the backup battery for the Absolute Pulse Coder (APC) dies while the machine is off, the absolute position data is lost.
The Symptom: You'll see an "APC" or "300" series alarm (e.g., 300 APC Alarm: Axis Need ZRN).
The Fix: You must re-home the axis manually and toggle Parameter 1815 (APZ bit) to 1 to re-establish the reference, which then refreshes the value in Parameter 1860. 2. Motor or Encoder Replacement
When you swap out a servo motor or its encoder, the new unit won't have a record of the old machine zero.
The Work: Technicians must physically move the axis to its home position and "set" the absolute zero. This process re-synchronizes the physical position with the value stored in the control. 3. "Grid Shift" Adjustments
If your machine's zero point is slightly off (e.g., after a minor crash), you might adjust Parameter 1850 (Grid Shift).
The Result: Changing the grid shift effectively shifts how the control interprets the data in Parameter 1860, moving the machine's "Home" without moving the physical encoder marker. 💡 Pro-Tip: Safety First Before making any changes to the 1800-series parameters: Back up your parameters to a USB or CF card. Record the current values of 1815 and 1860 for all axes.
Ensure you are in MDI Mode with the Parameter Write Enable (PWE) set to 1.
These are common values, but verify with your specific hardware:
20 (representing microns).40.Note: This parameter interacts with Parameter 1821 (Detected Unit/CMR). If 1821 is set incorrectly, 1860 will not solve the issue.
Imagine a Doosan Lynx 2100 lathe with a FANUC 0i-TF control. The operator notices that after every 500 rigid tapping cycles, the threads show increasing pitch error. The CNC maintenance team checks Parameter 1860 and finds it set at 1250.
Using a non-contact spindle orientation sensor, they determine the spindle is stopping 0.05mm away from true zero radially. They calculate:
They adjust Parameter 1860 from 1250 to 1224. After a test cycle, orientation improves to 0.002mm. Rigid tapping returns to 6H thread class quality.
This is parameter 1860 at work: a small numeric change delivering micron-level improvements in cutting accuracy.
The keyword "FANUC parameter 1860 work" is searched by technicians who have seen mysterious tapping failures, misoriented tools, or inconsistent spindle accuracy. Now you know: this small but powerful parameter provides the crucial link between electrical feedback and mechanical reality.
When you understand how FANUC Parameter 1860 works, you stop guessing and start diagnosing. You replace broken taps less often, reduce spindle downtime, and achieve thread quality that passes the tightest inspections.
Take action today:
If you suspect your 1860 setting is off, follow the calibration steps in this guide. Your machine—and your tool budget—will thank you.