## E3F2-R2B4 Photoelectric Sensor Overview The **E3F2-R2B4** is a cylindrical, M18-sized photoelectric sensor manufactured by Omron. It operates on a **retro-reflective** principle, meaning it requires a reflector to operate. --- ### Technical Specifications | Feature | Specification | | :--- | :--- | | **Sensing Type** | Retro-reflective (Radial) | | **Sensing Distance** | 0.1 to 2.0 meters (with E39-R1 reflector) | | **Supply Voltage** | 10 to 30 VDC | | **Output Type** | PNP Open Collector | | **Output Mode** | Light-ON / Dark-ON (Selectable via wiring) | | **Current Consumption** | 30 mA max. | | **Response Time** | 2.5 ms max. | | **Housing Material** | Plastic (ABS) or Brass (Nickel-plated) | | **Connection Method** | Pre-wired cable (2m) | --- ### Electronic Components & Pinout The sensor uses a 3-wire system. Understanding the wire colors is critical for proper electronic integration: 1. **Brown (Brown):** Positive Power Supply (+V / 10-30 VDC). 2. **Blue (Blue):** Negative Power Supply (0V / Ground). 3. **Black (Black):** Control Output (PNP). #### Circuit Logic (PNP) Since this is a **PNP** sensor, when the sensor is triggered, the Black wire will output a **High** signal (near the supply voltage). You must connect the load between the **Black (Output)** and **Blue (0V)** wires. --- ### Key Features * **Retro-reflective Principle:** The sensor emits an infrared or red light beam toward a reflector. Detection occurs when an object breaks the beam between the sensor and the reflector. * **M18 Housing:** Standardized metric threading makes it easy to mount in industrial brackets. * **Built-in Amplifier:** The electronics are self-contained; no external controller is needed to process the signal. * **Protection:** Usually features IP67 ingress protection (dust-tight and water-resistant) and short-circuit protection. --- ### Typical Application Diagram ```text [ Power Supply +V ]-----------( Brown ) | [ Load / PLC Input ]<----------( Black ) | [ Power Supply 0V ]-----------( Blue ) ```