The model number **M2XU-S2Z1-R** refers to a high-performance **Industrial Digital Panel Meter** (specifically a multi-functional signal converter/display) produced by **M-System** (now part of MG CO., LTD). This device is designed to measure DC input signals and provide isolated analog outputs and relay contacts for industrial automation. --- ## Technical Specifications Breakdown The alphanumeric code describes the specific configuration of the hardware: | Code Segment | Feature | Description | | :--- | :--- | :--- | | **M2XU** | Base Model | Multi-Function Signal Conditioner with 4-digit LED Display. | | **S** | Input Type | DC Input (Programmable range within -1000 to +1000 mV or -300 to +300 V). | | **2** | Output 1 | 4–20 mA DC (Isolated). | | **Z1** | Power Input | 100–240V AC (Universal Power Supply). | | **R** | Output 2 / Options | Relay Contact Output (Used for alarms or control). | --- ## Key Electronic Components & Functions ### 1. The Input Stage (Signal Conditioning) * **Analog-to-Digital Converter (ADC):** High-resolution sampling of the incoming DC voltage. It features high input impedance to prevent loading the source circuit. * **Programmable Scaling:** Users can scale the input (e.g., 0–10V) to display specific engineering units (e.g., 0–100.0% or 0–5000 RPM). ### 2. Isolation Circuitry * **Optical/Galvanic Isolation:** The device provides isolation between the Input, Output, and Power Supply. This protects sensitive PLC/DCS equipment from high-voltage surges or ground loops. * **Isolation Rating:** Usually rated for 2000V AC for 1 minute. ### 3. Output Stage * **DAC (Digital-to-Analog Converter):** Converts the processed signal back into a precise 4–20mA current loop for retransmission. * **Relay (The "R" in the suffix):** An electromechanical or solid-state relay used for "HI" or "LO" alarm limits. It can trigger an external siren or shut down a motor. ### 4. Display & Interface * **LED Display:** 4-digit red LED used for real-time monitoring. * **Front Keys:** Three buttons typically used to configure the "Zero" and "Span" without needing an external PC or communicator. --- ## Wiring Diagram Overview | Terminal No. | Function | | :--- | :--- | | **1 - 2** | Power Supply Input (100–240V AC) | | **3 - 4** | Analog Output 1 (4–20mA) | | **5 - 6** | Relay Contact Output | | **Input Terminals** | DC Signal (+ / -) | ---