## Overview of the EE-SX911-R The **EE-SX911-R** is a high-performance, ultra-compact **photoelectric microsensor** (slot-type/U-shaped) manufactured by OMRON. It is specifically designed for high-speed sensing in industrial automation, such as position detection or end-of-travel sensing. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Sensing Method** | Transmissive (Through-beam) | | **Slot Width** | 5 mm | | **Output Type** | NPN Open Collector | | **Operation Mode** | Dark-ON / Light-ON (Selectable via wiring) | | **Supply Voltage** | 5 to 24 VDC | | **Current Consumption** | 15 mA max. | | **Response Frequency** | 1 kHz (High-speed) | | **Indicator** | Red LED (Lights up when light is interrupted) | | **Connection** | Pre-wired (Standard 1m or 3m robot cable) | --- ### 2. Internal Electronic Components The sensor functions through a sophisticated integration of optoelectronic parts: 1. **Infrared Emitter (GaAs LED):** Located on one side of the "U" slot. It emits a constant beam of infrared light toward the receiver. 2. **Photo-transistor (Receiver):** Located on the opposite side of the slot. It converts the incoming light into an electrical signal. 3. **Signal Processing Circuit:** Includes a **Schmitt Trigger** to provide clean, digital switching and prevent "chattering" (rapid on/off switching) when the object is at the edge of the beam. 4. **Output Transistor:** An **NPN Open Collector** transistor that acts as the switch for the external load (e.g., PLC input or relay). --- ### 3. Wiring and Logic The "R" in the model name indicates a **Robot Cable** (flexible). The device uses a 3-wire or 4-wire configuration depending on the specific sub-model, allowing for logic selection: * **Brown:** Positive Supply (+V) * **Blue:** Ground (0V) * **Black:** Output (Control Output) * **Pink (if applicable):** Mode selection (Connect to V+ or Leave open to toggle Light-ON/Dark-ON). ### 4. Mechanical Design Features * **L-Shaped Body:** The 911 series features an L-shape, which is ideal for mounting on flat surfaces where the sensing axis needs to be perpendicular to the mount. * **Resin Filling:** The internal electronics are fully encapsulated in epoxy resin, providing resistance to vibration and moisture (IP50 rating). ---