The **PS-R11D** is a high-sensitivity, reflective-type photoelectric sensor, commonly used in industrial automation for object detection, position sensing, and count triggering. ### 1. Technical Specifications The core electronic profile of the PS-R11D is defined by its power requirements and output characteristics. | Feature | Specification | | :--- | :--- | | **Supply Voltage** | 12 to 24V DC ±10% | | **Current Consumption** | Max 25mA | | **Output Type** | NPN Open Collector | | **Sensing Distance** | Approx. 10 to 30 mm (adjustable) | | **Response Time** | Max 1ms | | **Light Source** | Infrared LED (modulated) | --- ### 2. Internal Electronic Components The device operates through a combination of optical and semiconductor stages: #### A. The Emitter (IR LED) The sensor contains an Infrared Emitting Diode. Unlike simple LEDs, this component is "modulated" (pulsed at a specific frequency) to ensure the sensor does not get triggered by ambient sunlight or overhead factory lighting. #### B. The Receiver (Phototransistor) A high-speed phototransistor or photodiode captures the reflected IR light. It is tuned to the specific frequency of the emitter. If the light intensity exceeds a certain threshold (determined by the distance of the object), the circuit triggers. #### C. Control Circuitry & Potentiometer * **Sensitivity Trimmer:** A small variable resistor (potentiometer) located on the housing. Turning this changes the gain of the internal amplifier, allowing you to fine-tune how close an object must be to trigger the sensor. * **Comparator IC:** An internal chip compares the received signal voltage against a reference voltage to decide the ON/OFF state. #### D. NPN Open Collector Output The output stage uses an NPN transistor. * **When triggered:** The output wire is pulled to Ground (0V). * **When idle:** The output is "floating" (High Impedance), requiring a pull-up resistor if connected to certain logic controllers. --- ### 3. Wiring Diagram (Electronic Interface) The PS-R11D typically follows standard industrial color coding: | Wire Color | Function | Connection | | :--- | :--- | :--- | | **Brown** | +V | Connect to 12-24V DC | | **Blue** | 0V / GND | Connect to Power Supply Ground | | **Black** | Output | Connect to Load or PLC Input (NPN) | --- ### 4. Operational Indicators * **Stability Indicator (Green LED):** Lights up when the receiving light has sufficient margin (not on the edge of detection), ensuring reliable operation. * **Output Indicator (Red/Orange LED):** Lights up when the output transistor is energized (object detected). ---