### Overview of Omron E3F2-R2RB4-S The **E3F2-R2RB4-S** is a high-performance cylindrical photoelectric sensor manufactured by Omron. It belongs to the E3F2 series, known for its robustness and ease of installation in industrial automation environments. This specific model is a **Retro-reflective** sensor. --- ### Technical Specifications The following table outlines the core electronic and physical characteristics of the device: | Feature | Specification | | :--- | :--- | | **Sensing Method** | Retro-reflective (requires a reflector) | | **Sensing Distance** | 0.1 to 2.0 Meters (using E39-R1 reflector) | | **Supply Voltage** | 10 to 30 VDC (including 10% ripple) | | **Output Type** | PNP Open Collector | | **Output Mode** | Dark-ON | | **Current Consumption** | 30 mA max. | | **Response Time** | 2.5 ms max. | | **Housing Material** | Plastic (M18 threaded barrel) | | **Connection Method** | Pre-wired (Standard cable length 2m) | --- ### Key Electronic Components & Features #### 1. Light Source and Detection The sensor utilizes an **Infrared LED** as its light source. In a retro-reflective setup, the light beam travels to a reflector and returns to the receiver located in the same housing. If an object breaks this beam, the sensor triggers the output. #### 2. PNP Open Collector Output * **Electronic Logic:** As a PNP output sensor, it "sources" current. When triggered, it connects the output wire to the positive supply voltage (Vcc). * **Dark-ON Mode:** The output is activated (ON) when the receiver **does not** see the reflected light (i.e., when an object is blocking the beam). #### 3. Protection Circuitry The E3F2 series includes built-in electronic safeguards: * **Reverse Polarity Protection:** Prevents damage if the power wires are swapped. * **Output Short-Circuit Protection:** Protects the internal transistors if the load is shorted. * **Mutual Interference Protection:** Allows sensors to be mounted close to one another without false triggering from adjacent light sources. --- ### Wiring Configuration The standard 3-wire color coding for this DC sensor is: 1. **Brown:** Positive Power Supply (+V / 10-30 VDC) 2. **Blue:** Negative Power Supply (0V / GND) 3. **Black:** Output Signal (PNP) ---