The **OBR1000-R3-E2** is a high-performance subminiature retroreflective photoelectric sensor manufactured by Pepperl+Fuchs. It is designed for space-constrained industrial applications requiring reliable object detection. --- ### ## Technical Specifications The following table outlines the key electrical and operational parameters of the OBR1000-R3-E2: | Feature | Specification | | :--- | :--- | | **Detection Principle** | Retroreflective (Requires a reflector) | | **Operating Voltage** | 10 ... 30 V DC | | **Output Type** | 1 PNP output, short-circuit protected, reverse polarity protected | | **Switching Type** | NO (Normally Open) / Dark-ON | | **Detection Range** | 0 ... 1000 mm | | **Light Source** | Red LED (modulated visible light) | | **Switching Frequency** | approx. 1000 Hz | | **Response Time** | 0.5 ms | | **Connection** | 2m fixed cable or M8 plug (depending on sub-variant) | --- ### ### Core Electronic Components & Logic #### 1. Light Emitter and Receiver The device houses a **Modulated Red LED**. The modulation ensures that the receiver only recognizes light pulsing at a specific frequency, preventing false triggers from ambient shop lighting or sunlight. #### 2. The PNP Switching Output (E2) The "E2" suffix signifies the electronic output configuration: * **PNP Logic:** When an object is detected (or the beam is broken), the sensor connects the output wire to the positive supply voltage ($+V$). * **Dark-ON:** This specific model typically triggers the output when the receiver **does not** see the reflected light (i.e., an object is blocking the beam). #### 3. Protection Circuitry The internal electronics are ruggedized for industrial environments: * **Reverse Polarity Protection:** Prevents damage if the DC power wires are swapped. * **Short-Circuit Protection:** Protects the internal transistors if the output load is shorted to ground. --- ### ### Wiring Diagram Representation The electrical connection typically follows the standard industrial color code: ```yaml Brown (1): +10...30V DC Blue (3): 0V (GND) Black (4): Signal Output (PNP / Dark-ON) ``` --- ### ### Key Application Advantages * **Subminiature Design:** The electronics are miniaturized to fit into a housing roughly the size of a thumbnail, making it ideal for robotic arms or small conveyor systems. * **Visible Red Light:** Simplifies alignment with the reflector during installation. * **High Frequency:** At 1000 Hz, it can detect objects moving at very high speeds without missing a trigger.