The **KRS-01-R** is an optical sensor commonly used in industrial automation, specifically as a high-performance **photoelectric switch** (often produced by brands like Kacon). It is designed to detect the presence or distance of objects using infrared light. --- ### 1. Key Electronic Components The internal circuitry of the KRS-01-R consists of several critical stages: | Component Stage | Function | | :--- | :--- | | **Emitter (IR LED)** | Projects a beam of modulated infrared light toward a target or reflector. | | **Receiver (Phototransistor)** | Captures reflected light and converts it into a small electrical current. | | **Modulator/Oscillator** | Pulses the light at a specific frequency to prevent interference from ambient sunlight or room lighting. | | **Comparator/Schmitt Trigger** | Evaluates the signal strength from the receiver to decide if the "switching" threshold has been met. | | **Output Driver** | Usually a transistor (NPN/PNP) or a relay contact that interfaces with a PLC or controller. | --- ### 2. Technical Specifications The "R" in the model name typically signifies a **Retro-reflective** type, meaning it requires a reflector to operate. | Parameter | Typical Value | | :--- | :--- | | **Operating Voltage** | 12 - 24V DC or 100 - 240V AC (model dependent) | | **Sensing Distance** | Up to 2 ~ 5 meters (with reflector) | | **Response Time** | < 1ms to 20ms | | **Output Type** | Relay Contact (SPDT) or NPN/PNP Transistor | | **Light Source** | Infrared LED (non-visible) | --- ### 3. Wiring Diagram (General) Most KRS-01-R units utilize a standard 5-wire system for relay output versions: ```markdown Wire Color | Function -------------|----------------------- Brown | Power (+) (L1) Blue | Power (-) (L2) White | Common (COM) Black | Normally Open (NO) Gray | Normally Closed (NC) ``` ### 4. Features and Adjustments * **Sensitivity Potentiometer:** A small screw on the back used to adjust the detection range. * **Light-ON / Dark-ON Switch:** Allows the user to select whether the output activates when light is received or when the beam is broken. * **LED Indicators:** * *Green:* Stability/Power indicator. * *Red/Orange:* Output/Operation indicator. ---