## OMRON E3S-R2B41: Electronic Overview The **E3S-R2B41** is a high-performance, self-contained photoelectric sensor specifically designed for the detection of **transparent objects** (such as glass or plastic bottles). It belongs to the E3S-R series by Omron. --- ### 1. Core Technical Specifications The following table highlights the essential electronic and operational parameters: | Feature | Specification | | :--- | :--- | | **Sensing Method** | Retro-reflective (with MSR function) | | **Sensing Distance** | 100 mm to 2 meters (with E39-R1 reflector) | | **Supply Voltage** | 12 to 24 VDC ±10% (ripple 10% max) | | **Current Consumption** | 40 mA maximum | | **Output Type** | PNP Open Collector | | **Control Output** | 100 mA max at 30 VDC | | **Response Time** | 1 ms maximum (Operate/Release) | | **Light Source** | Red LED (700 nm) | --- ### 2. Key Electronic Components & Functions #### A. PNP Output Stage This sensor utilizes a **PNP Open Collector** output. - **Operation:** When the sensor is triggered, the output wire (Black) connects to the positive supply (Vcc). - **Wiring:** Load should be connected between the Black (Output) and Blue (0V) wires. #### B. MSR (Mirror Surface Rejection) The E3S-R2B41 includes built-in polarizing filters. This is critical for electronic stability because it allows the sensor to distinguish between the light reflected by the **reflector** and the light reflected by a **shiny object**. #### C. Sensitivity Adjustment The unit features a **two-turn endless sensitivity adjuster**. This allows for fine-tuning the threshold level to detect even thin films or clear glass that might otherwise allow too much light to pass through to the receiver. #### D. Protection Circuitry The electronic design includes several safety features: - **Reverse Polarity Protection:** Prevents damage if the power leads are swapped. - **Output Short-circuit Protection:** Protects the internal transistor if the load is shorted. - **Mutual Interference Prevention:** Allows two sensors to be mounted in close proximity without affecting each other’s optical signals. --- ### 3. Wiring Diagram Structure Below is the standard wiring configuration for the PNP output: ```mermaid graph LR A[Brown: 12-24 VDC] --- S(Sensor) B[Blue: 0V] --- S C[Black: Output] --- L[Load/PLC Input] L --- B D[White: Mode Selection] --- A ``` * **Light-ON / Dark-ON:** The operating mode (whether the output turns ON when light is received or blocked) is usually selectable via the White wire or a switch on the housing. ---