The **MH47FCD-R** is an absolute magnetic rotary encoder manufactured by **Magnescale** (formerly Sony Precision Technology). It is designed for high-precision feedback in industrial automation, robotics, and motor control. --- ### ## Technical Specifications Overview Below is a breakdown of the core technical parameters for the MH47FCD-R series: | Feature | Specification | | :--- | :--- | | **Detection Method** | Magnetic Absolute | | **Resolution** | 17-bit (131,072 positions per revolution) | | **Output Interface** | SSI (Synchronous Serial Interface) or RS-485 | | **Supply Voltage** | 5V DC ± 5% | | **Current Consumption** | Max 150mA | | **Mechanical Speed** | Up to 6,000 RPM | | **Shaft Type** | Hollow Shaft (typically) | --- ### ### Key Electronic Components & Working Principle The MH47FCD-R operates on a magnetic sensing principle rather than optical, which makes it highly resistant to dust, oil, and vibration. 1. **Magnetic Disk (Scale):** A permanent magnet disk attached to the rotating shaft. It features specific magnetic poles that represent the absolute position. 2. **MR (Magneto-Resistive) Sensors:** These sensors detect changes in the magnetic field as the shaft rotates. Unlike optical encoders, there are no LEDs or photo-detectors to burn out. 3. **Signal Processing ASIC:** A custom integrated circuit converts the analog signals from the MR sensors into a high-resolution digital signal. 4. **Communication Driver:** The encoder uses a serial communication protocol (RS-485 physical layer) to transmit position data to the PLC or Servo Drive, reducing the number of wires needed compared to parallel outputs. --- ### ### Typical Wiring Configuration The unit usually features a multi-pin connector. A standard configuration involves the following signal lines: ```text Pin 1: Vcc (+5V) Pin 2: GND (0V) Pin 3: Data + (RS-485 / SSI) Pin 4: Data - (RS-485 / SSI) Pin 5: Clock + (For SSI models) Pin 6: Clock - (For SSI models) Case: Shield/Ground ``` --- ### ### Features and Benefits * **Absolute Positioning:** Unlike incremental encoders, the MH47FCD-R remembers its position even after a power loss, eliminating the need for a "homing" sequence. * **Durability:** Because it uses magnetic detection, it is less susceptible to failure in harsh environments compared to glass-disk optical encoders. * **Compact Design:** The "R" in the suffix often denotes a specific mounting or compact housing style suitable for integration into small servo motors.