What Does the Unit "LU" Represent in the Context of A6-PN Speed Parameter Configuration?

When configuring parameters for the A6-PN, you will encounter the unit LU.

LU, or Length Unit, is the "common language" created to solve this very problem. It does not represent a specific physical unit like meters or millimeters but is a standardized, dimensionless unit used internally within the motion control system. Its core function is to establish a unified measurement benchmark between the controller, drive, and motor. It converts all physical quantities into this common scale for calculation and communication, thereby greatly simplifying the internal complexity of the system.

Although LU itself is abstract, it has a clear conversion relationship with the real physical world, which is key to its ability to precisely command device movement. The common standard conversion in the industry is typically:

• For linear motion: 1 millimeter (mm) = 1,000 LU
• For rotary motion: 360° = 10,000 LU

This means that when an engineer sets the motor to move "10,000 LU" in the software, for a rotary axis, the motor will rotate exactly one revolution. This ratio is established during the initial project setup in the "Mechanical Parameter Configuration" or "Unit Conversion" phase and remains consistent throughout the entire project.

Advantages of Using LU

1. Standardization & Simplification: Regardless of the physical units actually used by the equipment, programmers only need to work with LUs when writing control logic (for position, speed, acceleration). This standardizes the programming interface.
2. Precision Assurance: The system internally performs calculations using integer or high-precision floating-point LU values. This avoids potential cumulative errors caused by mixing units and repeated conversions, ensuring control accuracy.
3. Enhanced Compatibility & Efficiency: It simplifies data exchange between equipment from different manufacturers. The controller does not need to understand the "dialect" of the underlying devices; it only needs to output unified "LU commands," improving system integration efficiency and communication reliability.

Updated on: 29/12/2025