The **M2UDS-A1-R2/N** is a specific model within the **M2 Series** of plug-in signal conditioners manufactured by **M-System** (now often branded as **MG CO., LTD.**). It is a digital indicator with a signal conditioning function, typically used in industrial automation to convert and display analog signals. --- ### 1. Model Code Breakdown Understanding the specific nomenclature of the device helps identify its electrical characteristics: | Code Segment | Description | Specific Detail for this Model | |:---|:---|:---| | **M2UDS** | Model Series | Digital Indicator with Signal Conditioner (Direct Current Input) | | **A1** | Input Type | 4 – 20 mA DC | | **R** | Output Type | 4 – 20 mA DC (Isolated) | | **2** | Power Input | 100 – 240V AC | | **N** | Standards/Options | No special certifications (Standard CE) | --- ### 2. Key Electronic Components & Features The device acts as a bridge between a sensor and a PLC/Controller while providing a local visual readout. #### A. Input Section (4-20mA) * **Input Impedance:** Usually around 250 $\Omega$ for current inputs. * **Protection:** Includes surge protection to prevent damage from line spikes. * **A/D Conversion:** The analog current is converted into a digital value via an internal Analog-to-Digital Converter for processing by the internal microprocessor. #### B. Display & Interface * **Display Type:** 4-digit, 7-segment LED. * **Scaling:** The 4-20mA input can be scaled to represent engineering units (e.g., 0 to 100.0% or 0 to 500 Bar). * **User Keys:** Front-panel buttons allow for calibration and scaling without needing an external PC. #### C. Output Section (4-20mA Isolated) * **Isolation:** The input, output, and power supply are mutually isolated. This prevents ground loops and protects sensitive PLC inputs. * **Drive Capability:** Typically supports a load resistance of up to 550 $\Omega$. * **Response Time:** Generally $\leq$ 0.5 seconds (to 90% of the signal). #### D. Power Supply * **Voltage Range:** 85 to 264V AC (Wide range). * **Internal SMPS:** Uses a Switch-Mode Power Supply to step down the AC voltage to the DC levels required by the internal ICs. --- ### 3. Technical Specifications | Parameter | Specification | |:---|:---| | **Accuracy** | ±0.1% of span | | **Temperature Coefficient** | ±0.015%/°C (±0.008%/°F) | | **Insulation Resistance** | 100 M$\Omega$ or more with 500V DC | | **Dielectric Strength** | 2000V AC @ 1 minute (Input to Output to Power to Ground) | | **Construction** | Plug-in base (Standard 8-pin or 11-pin socket depending on variation) | --- ### 4. Typical Connection Diagram (Simplified) ```text [ SOURCE: 4-20mA ] ------> [ Pins 1(+) & 2(-) ] : INPUT [ 100-240V AC ] ------> [ Pins 7(L) & 8(N) ] : POWER [ PLC / RECEIVER ] <------ [ Pins 4(+) & 5(-) ] : OUTPUT ``` ---