The **M2AMS2-B1-R2/N** is a high-precision digital panel meter typically manufactured by **Autonics** (or similar industrial automation brands). It is designed to measure and display analog signals such as voltage or current in industrial environments. --- ## 1. Technical Specifications Overview The electronic characteristics of this specific model are broken down in the table below: | Feature | Specification Details | | :--- | :--- | | **Input Type** | DC Voltage / DC Current (Multi-input) | | **Power Supply** | 100–240VAC 50/60Hz | | **Display Method** | 4-digit 7-segment LED | | **Output Type** | Relay Output (R2: 2-point relay) | | **Transmission** | None (Standard Indicator/Controller) | | **Measurement Accuracy** | ±0.1% F.S. ±1-digit | | **Sampling Cycle** | 50ms | --- ## 2. Core Electronic Components & Functions ### A. Input Stage (Signal Conditioning) The device features a high-impedance input stage that converts analog signals (e.g., 4-20mA, 0-10V) into a format the internal Microcontroller Unit (MCU) can process. * **ADC (Analog-to-Digital Converter):** High-resolution converter ensuring a display range of -1999 to 9999. * **Isolation:** The input circuitry is electronically isolated from the power supply to prevent ground loops and noise interference. ### B. Control & Logic (The "Brain") * **Microprocessor:** Manages the scaling of the input signal, handles the high/low alarm logic, and drives the LED display. * **EEPROM:** Non-volatile memory that stores user configurations (scaling values, alarm setpoints) even after power loss. ### C. Output Stage (Relay Logic) The **"R2"** in the model code signifies the presence of two relay outputs. * **Relay Type:** Typically SPST (Single Pole Single Throw) or SPDT. * **Function:** Used for "Hi" and "Lo" alarm triggers. When the measured value crosses a set threshold, the internal electromagnet closes the contact to trigger external sirens, lights, or PLC inputs. ### D. Power Supply Unit (PSU) * **Switching Mode Power Supply (SMPS):** Modern versions use an internal SMPS to handle a wide range of AC inputs (100-240V), providing stable DC voltage to the internal logic boards. --- ## 3. Terminal Connection Map The back of the unit features a terminal block typically organized as follows: 1. **Power Terminals:** Connection for AC source. 2. **Input Terminals:** Terminals for the sensor or signal source (Polarity sensitive). 3. **Relay Output Terminals:** Terminals for AL1 (Alarm 1) and AL2 (Alarm 2) dry contacts. --- ## 4. Model Code Breakdown | Segment | Meaning | | :--- | :--- | | **M2A** | Series Identifier (M2 Series Digital Meter) | | **MS2** | Size / Standard (S2 frame) | | **B1** | Power Supply (100-240VAC) | | **R2** | **Relay Output 2 points** | | **N** | No extra communication/transmission output |