The **M2UDS-A10-R** is a specific part number belonging to the **M2U Series** of digital indicator units, typically manufactured by companies like **Azbil (formerly Yamatake)**. These units are designed for industrial automation, specifically for displaying and scaling DC voltage or current signals. --- ### 1. General Specifications The "M2UDS-A10-R" code can be broken down into specific electronic characteristics: | Component Feature | Description | |:--- |:--- | | **Series** | M2U (Digital Indicator Unit) | | **Input Type** | DC Voltage / Current (Programmable/Universal) | | **Display** | 4-digit LED (typically red) | | **Power Supply** | 100–240V AC (Standard for the 'A' suffix) | | **Output Type** | Relay Contact or Alarm Output (Standard 'R' suffix) | | **Mounting** | DIN Rail or Panel Mount | --- ### 2. Key Electronic Functions #### A. Input Signal Conditioning The internal circuitry converts analog industrial signals (like 4-20mA or 1-5V DC) into a digital value. It uses an **Analog-to-Digital Converter (ADC)** to sample the input at high speeds (often 100ms to 250ms sampling cycles). #### B. Scaling and Offset The unit allows users to define a "Scale Low" and "Scale High." * **Example:** If the input is 4-20mA, the electronic display can be programmed to show 0.0 to 100.0 (representing percentage or pressure). #### C. Alarm/Relay Logic (The 'R' Suffix) The **-R** in the model name indicates the inclusion of a **Relay Output**. * **Electronic Hardware:** Contains an internal electromechanical relay. * **Function:** When the measured value hits a set point (High or Low limit), the internal circuit energizes the relay coil to close/open a contact for external equipment (like a buzzer or motor shut-off). --- ### 3. Wiring Configuration The back of the M2UDS-A10-R typically features a terminal block. Below is a standard pin-out logic for this series: ```text Terminals 1-2: Power Supply (100-240V AC) Terminals 4-5: Analog Input (+) and (-) Terminals 7-8: Relay Output (Normally Open/Closed) ``` --- ### 4. Technical Hardware Summary * **Isolation:** The unit features galvanic isolation between the power supply, input, and output circuits to prevent electrical noise interference. * **Retention:** Non-volatile memory (EEPROM) ensures that scaling parameters and alarm setpoints are saved even during power loss. * **Accuracy:** Generally ±0.1% of span ±1 digit.