The **OBE2000-R3-SP1-P** is a high-performance subminiature photoelectric sensor developed by Pepperl+Fuchs. It operates as a **Thru-Beam Sensor**, consisting of a separate transmitter and receiver. Below is a detailed breakdown of its electronic components, technical specifications, and wiring structure. --- ### 1. Core Technical Specifications The electronics of this device are designed for precision sensing in constrained spaces. | Feature | Specification | | :--- | :--- | | **Detection Principle** | Thru-beam (Emitter/Receiver pair) | | **Operating Voltage** | 10 ... 30 V DC | | **Current Consumption** | < 10 mA | | **Output Type** | PNP, Open Collector | | **Switching Mode** | Light-ON (outputs signal when beam is received) | | **Switching Frequency** | Approx. 1 kHz (Fast response) | | **Connection Type** | 2m Fixed Cable (3-wire) | --- ### 2. Internal Electronic Components The sensor integrates several specialized electronic stages within its subminiature housing: #### A. The Emitter Stage * **Light Source:** Uses a modulated **Visible Red LED** (approx. 630 nm). * **Modulation Circuit:** The electronics pulse the LED at a specific frequency to ensure the receiver ignores ambient light (like sunlight or room lamps). #### B. The Receiver Stage * **Phototransistor/Photodiode:** Captures the incoming red light signal. * **Signal Processor:** An internal ASIC (Application Specific Integrated Circuit) filters the signal to match the emitter's pulse frequency. * **Output Driver:** A **PNP transistor** acts as a switch. In "Light-ON" mode, the transistor closes the circuit between the positive supply (V+) and the signal wire when the beam is uninterrupted. --- ### 3. Wiring and Interface The electronic interface follows standard industrial color coding for 3-pin DC devices. | Color | Function | Description | | :--- | :--- | :--- | | **Brown (BN)** | +V (L+) | Positive supply voltage (10-30V DC) | | **Blue (BU)** | 0V (M) | Negative supply / Ground | | **Black (BK)** | Output (Q) | PNP switching signal (Connect to PLC/Load) | --- ### 4. Key Electronic Features * **Short-Circuit Protection:** The PNP output is electronically protected against wiring errors or overcurrent. * **Reverse Polarity Protection:** Prevents damage if the power supply wires are swapped. * **Status Indicators:** * **Green LED:** Indicates the device is powered on. * **Yellow LED:** Indicates the switching state (Light path is clear). ---