The **M2UDS2-10-R2/CE** is a high-performance **Digital Potentiometer (Remote Control Unit)** manufactured by **M-System** (part of the M2 Series). It is designed to convert external contact signals (Raise/Lower) into a DC output signal. --- ### 1. Key Technical Specifications | Feature | Specification | |:---|:---| | **Model Series** | M2 Series (Mini-M) | | **Power Input** | 100 – 240V AC (Standard for /CE models) | | **Output Type** | 4 – 20 mA DC | | **Input Signals** | Dry contact or Open Collector (Raise/Lower) | | **Response Time** | Configurable (Internal adjustment) | | **Accuracy** | ±0.1% | | **Mounting** | DIN Rail or Surface Mount | --- ### 2. Functional Components The device acts as an electronic interface that maintains a "memory" of a specific output level. Its internal electronic architecture consists of: #### A. Input Stage (Contact Interface) The device features two control inputs: 1. **UP (Raise):** Increases the output signal level. 2. **DOWN (Lower):** Decreases the output signal level. *These inputs are optically isolated to protect the internal circuitry from external electrical noise.* #### B. The Digital Memory Circuit Unlike a mechanical potentiometer that uses a wiper, the M2UDS2 uses a **digital counter and DAC (Digital-to-Analog Converter)**. - When the "Raise" contact is closed, the internal counter increments. - The DAC converts this digital value into a precise analog voltage/current. - **Power Failure Memory:** The device retains its last output value in non-volatile memory even if the power supply is interrupted. #### C. Ramp & Rate Control There are internal adjustments (potentiometers or switches behind the front cover) that allow the user to define the **Full-scale ramp time**. This determines how fast the signal moves from 0% to 100% when a contact is held down. --- ### 3. Electronic Protection & Standards * **Isolation:** Offers 2000V AC isolation between input, output, and power terminals. * **CE Marking:** The "/CE" suffix indicates compliance with European Union safety and EMC (Electromagnetic Compatibility) standards. * **Output Drive:** Capable of driving loads up to 750 $\Omega$ for the 4-20mA output. --- ### 4. Typical Wiring Diagram The device uses a **base socket** for wiring, allowing the electronic module to be replaced without disconnecting wires. ```text Terminals: [1] - Output (+) [2] - Output (-) [3] - UP Input [4] - DOWN Input [5] - Common (Input) [7] - L (Power AC) [8] - N (Power AC) ```