The **MLG-20-R** is a receiver unit for the MLG-2 (Modular Light Grid) series manufactured by **SICK Sensor Intelligence**. It is an automation light grid used for complex detection, measurement, and object monitoring. ### 1. Core Electronic Components & Architecture The MLG-20-R consists of several internal electronic layers designed for high-speed processing and environmental resilience. | Component | Description | | :--- | :--- | | **Optical Receiver Array** | A vertical row of photodiodes that detect infrared light emitted by the MLG-2-P (Sender). | | **Microcontroller (MCU)** | Processes beam interruption data and calculates object height, position, or volume. | | **ASIC Technology** | Custom SICK integrated circuits for synchronous scanning and interference suppression. | | **I/O Interface** | Hardware pins for digital inputs, outputs, and synchronization with the sender. | | **Status LEDs** | Optical indicators for power, alignment, and error diagnostics. | --- ### 2. Technical Specifications The "20" in the model name typically refers to the **beam separation (pitch)**, which is 20 mm. | Feature | Specification | | :--- | :--- | | **Operating Voltage** | 18 V DC ... 30 V DC | | **Current Consumption** | Receiver: ~140 mA + output load | | **Output Type** | Push-pull (PNP/NPN) or Fieldbus (IO-Link, Ethernet) | | **Response Time** | High-speed (varies by beam count) | | **Enclosure Rating** | IP65 / IP67 | --- ### 3. Electronic Features & Functions The electronic circuitry of the MLG-20-R supports advanced logic functions: * **Beam Blanking:** The electronics can be programmed to ignore specific beams (e.g., ignoring a conveyor belt). * **Object Recognition:** Differentiates between specific shapes based on which beams are broken. * **Synchronization:** Uses an optical or electrical "Sync" signal to ensure the receiver is perfectly timed with the sender's pulses. * **Self-Diagnostics:** Monitors for optical contamination (dust) and internal electronic failures. --- ### 4. Wiring and Connectivity The device typically uses **M12 circular connectors**. Below is a standard pin-out logic for MLG-2 receiver units: ```markdown 1: L+ (24V DC) 2: Q1 / Control Input 3: M (0V / Ground) 4: Q1 / C (Output or IO-Link) 5: QA1 (Analog output or Sync) ``` ---