The **PM-R65** is a part of the PM-65 series of U-shaped micro photoelectric sensors manufactured by Panasonic (formerly Sunx). These sensors are widely used in industrial automation for position sensing, limit detection, and counting. ### 1. Technical Specifications The "R" in PM-R65 refers to the **R-shaped** housing configuration. Below are the primary electronic and physical specifications: | Feature | Specification | | :--- | :--- | | **Sensing Range** | 6 mm (fixed) | | **Supply Voltage** | 5 to 24 V DC ±10% | | **Current Consumption** | 15 mA or less | | **Output Type** | NPN or PNP (Model dependent, e.g., PM-R65 is NPN) | | **Output Operation** | Dual output (Light-ON / Dark-ON) | | **Response Time** | 20 $\mu$s or less under light received condition | | **Indicator** | Orange LED (lights up when light is received) | | **Protection** | IP64 (dust-tight and splash-resistant) | --- ### 2. Connection and Wiring The PM-R65 typically features 4 terminals or wires. Because it provides **Dual Output**, you can choose between Light-ON and Dark-ON behavior depending on which output wire you connect. #### Terminal/Wire Configuration: * **Brown:** +V (Positive Power Supply) * **Blue:** 0V (GND) * **Black:** Output 1 (Light-ON) * **White:** Output 2 (Dark-ON) --- ### 3. Key Electronic Components The internal circuitry of the PM-R65 consists of three main stages: 1. **Emitter (Infrared LED):** Emits a beam of infrared light across the 6mm gap. 2. **Receiver (Phototransistor):** Detects the infrared beam. If an object blocks the gap, the phototransistor changes state. 3. **Output Transistor:** An open-collector transistor (usually NPN for the standard PM-R65) that acts as a switch for the external load (e.g., a PLC input or a relay). ### 4. Dimensions and Mounting The "R-type" indicates the orientation of the mounting holes relative to the sensing axis: * **Shape:** U-shaped / Fork sensor. * **Mounting:** The R-type allows for mounting from the side, making it ideal for tight spaces where vertical mounting is not possible. ---