The **M2SES-1AA-R2/CE** is a high-precision, plug-in type Signal Conditioner (Isolator) manufactured by **M-System**. It is part of the Mini-M series, designed to provide electrical isolation and signal conversion between industrial instruments. ### 1. General Specifications This device acts as a buffer to prevent ground loops and protect sensitive control systems (like PLCs or DCS) from electrical noise and surges on the field side. | Feature | Specification | | :--- | :--- | | **Model Series** | Mini-M Series (M2SES) | | **Input Signal** | 4 – 20 mA DC | | **Output 1** | 4 – 20 mA DC | | **Output 2** | 4 – 20 mA DC | | **Power Supply** | 100 – 240 V AC (Standard) | | **Mounting** | Plug-in Socket (surface or DIN rail) | | **Standards** | CE Marking (EMC Directive) | --- ### 2. Key Electronic Components & Internal Functions The internal architecture of the M2SES-1AA-R2/CE relies on three primary stages to ensure signal integrity: #### A. Input Stage * **Precision Resistor:** Converts the 4-20mA current loop into a voltage signal. * **Filtering Circuit:** Uses capacitors and inductors to suppress High-Frequency (HF) noise often found in industrial environments. #### B. Isolation Stage (The Core) * **Optical or Transformer Isolation:** This part physically separates the input, output, and power circuits. * **Purpose:** It ensures that a high-voltage surge on the input side does not travel through to the output (protecting the PLC). #### C. Output Stage * **Operational Amplifiers (Op-Amps):** These provide high-impedance buffering and gain adjustment to ensure the output remains a steady 4-20mA regardless of the load resistance (up to 550Ω). * **Zero/Span Adjustments:** Potentiometers located on the front panel allow for fine-tuning the electronic calibration of the output signals. --- ### 3. Terminal Assignment (Typical) The device uses a base socket for wiring. Below is the standard pin configuration for the R2/CE model: | Pin No. | Function | Description | | :--- | :--- | :--- | | 1 | Output 1 (+) | Positive 4-20mA signal | | 2 | Output 1 (-) | Negative 4-20mA signal | | 3 | Output 2 (+) | Positive 4-20mA signal | | 4 | Output 2 (-) | Negative 4-20mA signal | | 5 | Input (+) | Positive Current Input | | 6 | Input (-) | Negative Current Input | | 7 | Power (L) | AC Line Power | | 8 | Power (N) | AC Neutral Power | --- ### 4. Technical Performance * **Accuracy:** ±0.1% of span. * **Response Time:** ≤ 0.5 seconds (0 – 90%). * **Isolation Resistance:** 100 MΩ minimum with 500V DC. * **Dielectric Strength:** 2000V AC @ 1 minute (Input to Output to Power to Ground). ---