The **M2UDS2-AD-R** is a specific model within the M2 Series of Signal Conditioners (Transmitters) manufactured by **M-System**. This device is primarily used in industrial automation to convert a pulse signal into a standard analog signal (DC current or voltage). --- ### 1. Part Number Breakdown Understanding the specific configuration of the M2UDS2-AD-R: | Code | Component | Description | | :--- | :--- | :--- | | **M2** | Series | M2 Series Signal Conditioners (Mini-M) | | **UDS2** | Model | Pulse-to-Analog Transmitter (Universal) | | **-A** | Input | AC (Line) Power Supply (100–240V AC) | | **-D** | Output | DC Current (4–20mA DC) | | **-R** | Power Supply | 24V DC (Note: In some sub-series, R indicates power type) | *Note: In the standard M-System nomenclature, the `-AD` usually refers to the Power/Output combination. Specifically, **A** is the Input type, **D** is the Output, and **R** is the 24V DC power source.* --- ### 2. Technical Specifications The core electronic function of this device is to perform **Frequency-to-Analog (F/V or F/I) conversion**. | Feature | Specification | | :--- | :--- | | **Input Signal** | Dry contact, open collector, voltage pulse, or RS-422 line driver | | **Frequency Range** | 0 – 0.01 Hz up to 0 – 100 kHz (User configurable) | | **Output Signal** | 4 – 20 mA DC (Standard) | | **Accuracy** | ±0.1% of span | | **Response Time** | Max 0.5 sec (0 to 90%) | | **Isolation** | 3-way isolation (Input to Output to Power) | | **Mounting** | DIN Rail Mounting (Plug-in base) | --- ### 3. Key Electronic Functions 1. **Pulse Integration:** The device monitors the frequency of incoming digital pulses. It uses an internal microprocessor to calculate the frequency over a specific time window. 2. **Galvanic Isolation:** It provides 2000V AC isolation between the input, output, and power supply. This prevents ground loops and protects sensitive PLC/DCS equipment from high-voltage surges in the field. 3. **Output Scaling:** The unit converts the measured frequency into a proportional analog signal. For example, if configured for 0-1000Hz, a 500Hz input would result in a 12mA output (the midpoint of 4-20mA). 4. **Low-Cut Function:** Used to eliminate noise. If the frequency falls below a certain threshold, the output is forced to 0% (4mA). --- ### 4. Typical Application Circuit The unit is typically wired as follows: ```mermaid graph LR A[Flow Meter / Encoder] -- Pulse Signal --> B(M2UDS2) C[24V DC Power] --> B B -- 4-20mA Signal --> D[PLC / Controller] ``` ---