The **MLG-2 WebChecker (MLG-2G-R)** is a high-resolution measurement automation light grid manufactured by SICK. It is specifically designed for edge detection, width measurement, and center positioning of moving webs (like paper, plastic, or metal). --- ### 1. Core Electronic Components The system consists of two main hardware units and internal processing electronics: | Component | Function | Description | | :--- | :--- | :--- | | **Sender Unit** | Infrared Emission | Contains an array of IR LEDs that pulse at high frequencies. | | **Receiver Unit** | Signal Processing | Contains phototransistors and the primary "Pro" controller logic. | | **ASIC Technology** | Integrated Circuit | Uses specialized SICK ASICs for high-speed signal evaluation. | | **Synchronization** | Optical/Wire Sync | Ensures the sender and receiver are perfectly timed for scanning. | ### 2. Technical Specifications (Electronics) The electronic performance of the MLG-2G-R is defined by its high-speed processing capabilities: * **Supply Voltage:** 18 V ... 30 V DC (Ripple < 5 Vpp). * **Power Consumption:** Varies by beam count, typically < 200 mA (excluding output load). * **Resolution (Beam Separation):** Down to 5 mm, but electronically enhanced via "Cross-beam" or "High-speed" modes. * **Output Signals:** * **Analog:** 4 mA ... 20 mA or 0 V ... 10 V (Software configurable). * **Switching:** Push-pull (PNP/NPN) outputs for limit monitoring. * **Communication:** IO-Link (standard), with options for RS-485, Ethernet/IP, PROFINET, or EtherCAT. ### 3. Electronic Interfaces and Wiring The MLG-2G-R uses standard M12 industrial connectors. The pin assignment is critical for electronic integration: ```yaml Pin Configuration (Receiver M12, 8-pin): 1: L+ (24V DC) 2: Sync_A (Communication between units) 3: M (0V / Ground) 4: Q1 / C (Digital Output / IO-Link) 5: Q2 (Digital Output) 6: QA1 (Analog Output 1) 7: QA2 (Analog Output 2) 8: Sync_B (Communication between units) ``` ### 4. Advanced Electronic Functions The "G-R" (WebChecker) variant includes specific electronic firmware features: * **Edge Tracking:** The electronics can track up to 10 different edges simultaneously. * **Web-Width Calculation:** Real-time calculation of material width based on the blocked/unblocked beam status. * **Ambient Light Immunity:** Electronic filters prevent interference from high-frequency factory lighting or sunlight. * **Automatic Sensitivity Adjustment:** The system adjusts beam intensity electronically to compensate for dust buildup on the lenses. ---