The **W2VS-1AY-R2** is a high-performance **Signal Conditioner (Isolator)** manufactured by **M-System**. It is primarily used in industrial automation to convert, isolate, and transmit DC signals between field devices and control systems (like PLCs or DCS). Below is a breakdown of its technical specifications and electronic characteristics. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Model Type** | Dual-output Signal Conditioner (Isolator) | | **Input Signal** | 4 – 20 mA DC | | **Output 1** | 4 – 20 mA DC | | **Output 2** | 1 – 5 V DC | | **Power Input** | 24V DC (approx. 80mA) | | **Accuracy** | ±0.1% of span | | **Isolation** | 3-way isolation (Input to Output to Power) | | **Mounting** | DIN Rail Mounting | --- ### 2. Core Electronic Components & Functions The device is composed of several critical electronic stages to ensure signal integrity: #### A. Input Circuitry * **Current Shunt:** Converts the 4-20mA input loop into a voltage that the internal processing unit can read. * **Protection Diode:** Protects the internal circuits from polarity reversal or overcurrent. #### B. Isolation Barrier (Galvanic Isolation) * **Optical or Magnetic Coupling:** The "R2" series typically uses high-speed transformers or opto-couplers to physically separate the input, output, and power circuits. * **Purpose:** This prevents "Ground Loops" and protects sensitive PLC inputs from high-voltage surges in the field. #### C. Signal Processing * **Zero/Span Adjustments:** Located on the front panel, these potentiometers allow the user to fine-tune the calibration of the electronic output relative to the input. * **Filtering:** Internal low-pass filters remove high-frequency noise (EMI/RFI) picked up by long field cables. #### D. Dual Output Drivers * Unlike standard isolators, this model provides **two independent outputs**. * The electronic driver for **Output 1** is designed for high-impedance current loops (up to 750Ω). * The driver for **Output 2** is a voltage source designed for monitoring equipment. --- ### 3. Wiring Configuration To interface with the electronic terminals, follow this standard pin layout: ```text Terminal | Function ---------|------------------- 1 - 2 | Output 1 (+) / (-) 3 - 4 | Output 2 (+) / (-) 5 - 6 | Input (+) / (-) 7 - 8 | Power Supply (24V DC) ``` --- ### 4. Application Use-Case The **W2VS-1AY-R2** is commonly used when a single 4-20mA sensor needs to send data to two different locations—for example, sending the primary signal to a **PLC** (via Output 1) and a local **Digital Chart Recorder** (via Output 2), while ensuring that a failure in one device does not affect the other.