The **E3JK-R2S32M** is a high-performance, long-distance retro-reflective photoelectric sensor manufactured by Omron. It is widely used in industrial automation for detecting objects across conveyors or entrances. --- ## 1. Technical Specifications Below are the primary electrical and physical characteristics of the E3JK-R2S32M. | Feature | Specification | | :--- | :--- | | **Sensing Method** | Retro-reflective (requires a reflector) | | **Sensing Distance** | Up to 5 Meters (using E39-R1 reflector) | | **Supply Voltage** | 24 to 240 VAC / 24 to 240 VDC (Multi-voltage) | | **Output Type** | Relay Output (SPDT) | | **Control Output** | 3A at 250 VAC (Resistive Load) | | **Light Source** | Red LED (Visible) | | **Operation Mode** | Light-ON / Dark-ON (Switch selectable) | | **Response Time** | 20 ms Max | | **IP Rating** | IP64 | --- ## 2. Pinout and Wiring Configuration The device uses a 5-core cable. Because it features a relay output, it acts as a dry contact switch rather than a transistor (NPN/PNP) output. ### Wiring Table | Wire Color | Function | Description | | :--- | :--- | :--- | | **Brown** | Power (L/+) | 24-240V AC/DC Power Supply | | **Blue** | Power (N/-) | 24-240V AC/DC Power Supply | | **White** | Common (COM) | Relay Common Terminal | | **Black** | Normally Open (NO) | Closes when object is detected (in Light-ON) | | **Gray** | Normally Closed (NC) | Opens when object is detected (in Light-ON) | --- ## 3. Key Electronic Features ### A. Universal Voltage Input One of the standout electronic features is the **Switching Power Supply** built into the unit. It can handle a wide range of input voltages (both AC and DC), eliminating the need for a separate step-down transformer or specific DC power supply. ### B. Relay Output (Mechanical Contact) Unlike solid-state sensors that output a small voltage, the E3JK-R2S32M uses a physical **Electromagnetic Relay**. * **Pros:** Can switch high-current loads directly (up to 3A). * **Cons:** Slower response time (20ms) compared to transistors, and has a limited mechanical life (approx. 50 million operations). ### C. Visible Red Beam The sensor emits a visible red light. This simplifies the electronic setup because: 1. It allows for easy physical alignment with the reflector. 2. The internal **Pulse Modulation** prevents interference from ambient room lighting or sunlight. ### D. Mode Selection The sensor includes an internal slide switch to toggle between: * **Light-ON:** Relay energizes when the beam is reflected back. * **Dark-ON:** Relay energizes when the beam is broken (interrupted). --- ## 4. Basic Connection Logic ```mermaid graph LR A[Power 24-240V] --> B[Brown/Blue Wires] C[Load/PLC Input] --> D[White - Common] D --> E[Black - NO] D --> F[Gray - NC] ```