The **W2VS-121-R** is a specific model within the **W2 series of Signal Conditioners** (Isolators) manufactured by **M-System**. It is designed to take a DC input signal and provide two isolated DC output signals. --- ### ## Technical Specifications Below are the primary electronic characteristics and ratings for this specific model: | Feature | Specification | | :--- | :--- | | **Model Type** | Ultra-Slim Signal Splitter (Isolator) | | **Input Signal** | 4 – 20 mA DC | | **Output 1** | 4 – 20 mA DC | | **Output 2** | 1 – 5 V DC | | **Power Input** | 24 V DC | | **Accuracy** | ±0.1% | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Isolation** | 3-way (Input to output 1 to output 2 to power) | | **Mounting** | DIN Rail | --- ### ### Key Electronic Components & Functions 1. **Isolation Barrier (3-Way):** The "121" configuration indicates full isolation between the input, both outputs, and the power supply. This prevents ground loops and protects sensitive control equipment from surges or noise on the field side. 2. **Signal Splitter Logic:** The internal circuitry duplicates the primary 4-20mA loop. Output 1 remains a current loop (4-20mA), while Output 2 is converted to a voltage signal (1-5V), allowing one sensor to feed two different devices (e.g., a PLC and a local display). 3. **Zero and Span Adjustments:** Located on the front panel, these potentiometers allow for fine-tuning the calibration of the electronic outputs to ensure precise signal reproduction. 4. **LED Indicator:** A front-facing power LED indicates the status of the internal electronics and the 24V DC power feed. --- ### ### Wiring Diagram Representation The unit typically uses tension-clamp or screw terminals. Below is a conceptual representation of the pin-out: ```text Power Supply: (+) Terminal 7 (24V DC) (-) Terminal 8 (0V) Input Signal: (+) Terminal 5 (-) Terminal 6 Output 1 (4-20mA): (+) Terminal 1 (-) Terminal 2 Output 2 (1-5V): (+) Terminal 3 (-) Terminal 4 ``` ---