The part number **W2VS-A1B1-R2/K** refers to a high-precision **Signal Conditioner (Isolator)** manufactured by **M-System** (now part of MG CO., LTD). This device is part of the W2-series, designed to convert and isolate DC input signals into dual DC output signals. --- ### 1. Part Number Breakdown To understand the electronic capabilities, we can decode the nomenclature: | Code Segment | Description | Specific Detail | | :--- | :--- | :--- | | **W2VS** | Model Series | Dual-output Signal Conditioner (Isolation) | | **-A** | Input Signal | 4 to 20 mA DC | | **1** | Output 1 | 4 to 20 mA DC | | **B1** | Output 2 | 1 to 5 V DC | | **-R** | Power Input | 24 V DC | | **2** | Isolation | 3-way isolation (Input to Output 1 to Output 2 to Power) | | **/K** | Option | Multi-coated (for moisture/dust resistance) | --- ### 2. Key Technical Specifications The electronic architecture is designed for industrial environments where signal integrity and noise rejection are critical. * **Isolation Type:** Galvanic isolation using optical or magnetic coupling. * **Isolation Strength:** 2000V AC @ 1 minute (Input to Output 1 to Output 2 to Power). * **Accuracy:** ±0.1% of span. * **Response Time:** ≤ 0.5 seconds (0 – 90%). * **Temperature Coefficient:** ±0.015% per °C (±0.008% per °F). * **Protection:** Overload protection and surge protection for industrial transients. --- ### 3. Electronic Architecture & Function The device acts as a bridge between a sensor (field side) and a controller (PLC/DCS side). #### A. Input Stage The **"A"** designation indicates a current loop input. It features a low-impedance shunt resistor to convert the 4-20mA current into a voltage that the internal operational amplifiers can process. #### B. The Isolation Barrier The core electronic feature is the **3-way isolation**. This prevents ground loops from damaging sensitive equipment. If a surge occurs on the input side (e.g., a lightning strike or motor fault), the isolation barrier prevents the high voltage from reaching the Output or the Power supply. #### C. Output Stage * **Output 1 (4-20mA):** A constant-current source circuit. Even if the load resistance changes (up to 750Ω), the circuit adjusts the voltage to maintain the correct current. * **Output 2 (1-5V):** A high-impedance voltage output typically used for local displays or parallel PLC inputs. --- ### 4. Connection Diagram (Simplified) | Terminal No. | Function | Description | | :--- | :--- | :--- | | **1 / 2** | Input (+ / -) | From 4-20mA Sensor | | **3 / 4** | Output 1 (+ / -) | 4-20mA to Control System | | **5 / 6** | Output 2 (+ / -) | 1-5V to Monitor/Recorder | | **7 / 8** | Power (+ / -) | 24V DC Supply | ---