The **M2VF2-B1-R2/UL** is a high-precision, plug-in type signal conditioner (transmitter) manufactured by **M-System** (now part of MG CO., LTD). It is specifically designed to convert a variable frequency pulse signal into a standard analog DC output. ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Primary Function** | Frequency-to-DC Converter (V-to-I/V-to-V) | | **Model Series** | Mini-M Series (Plug-in base) | | **Input Signal** | Pulse (Dry contact, Open collector, or Voltage pulse) | | **Output Signal** | 4 – 20 mA DC (Standard for R2 suffix) | | **Power Supply** | 24V DC | | **Response Time** | Max. 0.5 sec (0 – 90%) | | **Accuracy** | ±0.1% of span | | **Certifications** | UL/C-UL recognized, CE Marking | --- ### 2. Functional Electronic Components The device utilizes a sophisticated circuit architecture to ensure signal isolation and linear conversion: * **Input Pulse Shaper:** Filters noise and converts varying pulse shapes (square, sine, etc.) into a uniform internal trigger signal. * **Microprocessor-based Logic:** Calculates the frequency based on the time interval between pulses. This digital approach ensures higher accuracy compared to older analog "charge pump" methods. * **Isolation Barrier:** Uses optical or magnetic isolation to separate the input, output, and power circuits (3-way isolation). This prevents ground loops and protects the PLC/DCS from surges. * **D/A Converter & Output Buffer:** Converts the processed digital value back into a precise analog current (4-20mA) or voltage signal. --- ### 3. Model Suffix Breakdown The specific nomenclature `M2VF2-B1-R2/UL` defines its internal hardware configuration: * **M2VF2:** Model number for Frequency Transmitter. * **B:** Input code (Specific frequency range, e.g., 0 – 100 Hz or as specified). * **1:** Output code (Typically 4 – 20 mA DC). * **R2:** Power Input (24V DC). * **UL:** Indicates the unit meets UL/C-UL safety standards for the North American market. --- ### 4. Connection Diagram (General) ```mermaid graph LR A[Pulse Sensor] -->|Frequency In| B(M2VF2 Converter) B -->|4-20mA Out| C[PLC / Controller] D[24V DC Power] --> B ```