The **XHS35F-50-R2-FS-XPROGA** is a high-performance, hollow-shaft incremental encoder manufactured by BEI Sensors (Sensata Technologies). It is specifically designed for heavy-duty industrial environments, such as motor feedback and factory automation. --- ### 1. Technical Specifications Table | Feature | Specification | | :--- | :--- | | **Model Series** | XHS35 (Heavy Duty, 3.5" Diameter) | | **Shaft Type** | Hollow Shaft (usually 50mm or specific bore size) | | **Resolution** | Programmable (XPROG designates programmability) | | **Output Type** | Differential Line Driver (RS422) | | **Supply Voltage** | 5V to 28V DC | | **Connection** | Connectorized or Cable lead (varies by sub-config) | | **Mechanical Speed** | Up to 6,000 RPM | | **Environmental Rating** | IP65 (Standard) | --- ### 2. Breakdown of the Model Code The part number follows a specific nomenclature used by BEI Sensors: * **XHS35**: Extreme Heavy Duty Hollow Shaft 3.5 inch series. * **F**: Indicates a specific mounting style (typically a flex mount for shaft alignment). * **50**: Refers to the physical dimensions of the shaft/bore (often a 1/2" or 50mm reference depending on metric/inch standards). * **R2**: Standard electronic interface (often 4427/8830 line driver compatible). * **FS**: Functional Safety features or specific mechanical sealing. * **XPROGA**: **Programmable Resolution**. This is the key feature, allowing the user to define the Cycles Per Revolution (CPR) via software rather than having a fixed hardware count. --- ### 3. Key Electronic Components & Functions #### A. The Optical Disc and Sensor The core of the unit contains an optical glass or plastic disc. In the "XPROG" version, the sensor uses a specialized ASIC (Application Specific Integrated Circuit) that interpolates the raw signals to provide a user-defined resolution. #### B. Line Driver Electronics (R2) The "R2" designation typically refers to a **Differential Line Driver** (RS-422). * **Function**: It generates complementary signals (A, A-not, B, B-not, Z, Z-not). * **Benefit**: This prevents data loss and minimizes electromagnetic interference (EMI) over long cable runs. #### C. Power Regulation The internal electronics are designed for a wide input range (5V to 28V). It includes: * **Reverse Polarity Protection**: Prevents damage if the power leads are swapped. * **Short Circuit Protection**: Protects the output stages from wiring faults. --- ### 4. Wiring Diagram (Typical) Most XHS35 units use a standard M12 or M23 connector pinout. ```text Pin/Color | Signal | Description ----------|---------|------------------------- Red | Vcc | Power Supply (5-28V) Black | GND | Common Ground White | A | Channel A (Pulse) Yellow | A/ | Channel A Inverted Blue | B | Channel B (Quadrature) Green | B/ | Channel B Inverted Orange | Z | Index Mark (Once per rev) Brown | Z/ | Index Mark Inverted ``` ---