The **M2UDS-D1-R2/N** is a specific model within the **M2UDS Series** of Digital Digital Potentiometers (or Digital Setting Units) manufactured by **M-System**. These devices are designed to provide a manual analog output signal (like 4-20mA or 1-5V) controlled via digital push-button increments/decrements. --- ### 1. Model Breakdown The suffix/code explains the specific electronic configuration of this unit: | Code Segment | Description | Specific Detail | | :--- | :--- | :--- | | **M2UDS** | Series Name | Digital Setting Unit (Potentiometer) | | **D1** | Output Signal | **4 – 20 mA DC** (Load resistance 750 $\Omega$ max) | | **R2** | Power Input | **100 – 240V AC** (Universal AC supply) | | **N** | Option | **None** (Standard configuration) | --- ### 2. Key Electronic Features #### Signal Generation and Control The device acts as a manual signal source. Unlike a traditional mechanical potentiometer that uses a wiper on a resistive element, the M2UDS uses digital logic to control an internal **Digital-to-Analog Converter (DAC)**. * **Up/Down Control:** Front-panel buttons increase or decrease the output. * **Resolution:** Typically offers high-precision output steps (0.1% or 0.01% depending on settings). * **Memory:** It features non-volatile memory (EEPROM) that stores the last output value in case of a power failure. #### Power Supply & Isolation * **Galvanic Isolation:** The unit provides 3-way isolation between the **Power Supply**, **Input (Control)**, and **Output**. * **Dielectric Strength:** Usually rated for 2000V AC @ 1 minute. * **Internal Protection:** Includes surge protection and EMI filtering for industrial environments. #### Terminal Connections The unit typically uses a M3.5 screw terminal base. 1. **Output (4-20mA):** Terminals for the positive and negative current loop. 2. **Power:** Terminals for the 100-240V AC line. 3. **External Inputs:** Terminals for remote "UP" and "DOWN" dry contact signals. --- ### 3. Technical Specifications Table | Parameter | Specification | | :--- | :--- | | **Output Type** | Current Loop (Active) | | **Output Range** | 4.00 to 20.00 mA DC | | **Supply Voltage** | 85 – 264 V AC (47 – 66 Hz) | | **Power Consumption** | Approx. 3 VA | | **Accuracy** | ±0.1% of span | | **Operating Temperature** | -5 to +55 °C (23 to 131 °F) | | **Mounting** | DIN Rail or Surface Mount | --- ### 4. Circuit Application Example The M2UDS-D1-R2/N is frequently used as a **Remote Setpoint Generator** for Variable Frequency Drives (VFDs) or PID Controllers. ```mermaid graph LR A[AC Power 100-240V] --> B[M2UDS-D1-R2/N] B --> C{4-20mA Signal} C --> D[VFD / Motor Speed Control] C --> E[Control Valve Positioner] ```