The **M2VS-AC-R2** is a high-performance **Mini-M configuration Signal Conditioner (Isolator)** manufactured by M-System. It is primarily used in industrial automation to isolate and convert DC voltage or current signals. --- ### 1. Key Technical Specifications Below are the primary electronic characteristics of the M2VS-AC-R2: | Feature | Specification | | :--- | :--- | | **Input Signal** | 4 – 20 mA DC | | **Output Signal** | 4 – 20 mA DC | | **Power Input** | 100 – 240V AC (Operating range 85 – 264V AC) | | **Isolation** | 3-way (Input to Output to Power) | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Accuracy** | ±0.1% of span | | **Mounting** | DIN rail or Surface mounting | --- ### 2. Core Electronic Components & Architecture The device functions through a sophisticated circuitry path designed for precision and protection: #### A. Input Circuitry The input stage uses a precision shunt resistor to convert the 4-20mA current into a voltage. It often includes **Surge Protectors** (Varistors/Zener diodes) to protect the internal logic from line spikes. #### B. Isolation Barrier (The "R2" Designation) * **Magnetic/Optical Isolation:** The M2VS uses high-speed transformers or optoisolators to physically separate the input, output, and power circuits. * **Purpose:** This prevents "Ground Loops" and protects sensitive PLC/DCS equipment from high-voltage transients occurring on the field side. #### C. Power Supply Section As an "AC" model, it contains an internal **Switching Mode Power Supply (SMPS)**. This converts the 100-240V AC mains down to the regulated DC voltages (typically 5V or 15V) required for the internal operational amplifiers and isolation components. #### D. Adjustment Elements On the front panel, the unit features two multi-turn potentiometers (trimmers): * **Zero Adjustment:** Shifts the baseline (e.g., ensuring 4mA in = 4mA out). * **Span Adjustment:** Changes the gain (e.g., ensuring 20mA in = 20mA out). --- ### 3. Terminal Connection Map The M2VS-AC-R2 typically uses a socket-type base for easy wiring: | Terminal No. | Function | Description | | :--- | :--- | :--- | | **1 & 2** | Output (+) / (-) | Connected to the receiving instrument (PLC/Recorder) | | **4 & 5** | Input (+) / (-) | Connected to the field sensor/transmitter | | **7 & 8** | Power U (+) / V (-) | AC Power Supply connection | --- ### 4. Why use the "R2" Version? The "R2" suffix specifically refers to the **High-density M-Unit series**. It is designed for space-saving environments where multiple isolators need to be packed tightly on a DIN rail, offering high reliability and low heat dissipation.