The **PM-R64P** is a high-precision, U-shaped (slot) micro photoelectric sensor manufactured by **Panasonic (formerly Sunx)**. It is widely used in industrial automation for sensing the presence of objects, motor speed control (via encoder disks), and limit switching. --- ### 1. Key Technical Specifications The PM-R64P belongs to the **PM-64 series**. Below are its core electrical characteristics: | Feature | Specification | | :--- | :--- | | **Sensing Method** | Thru-beam (U-shaped) | | **Sensing Distance** | 5 mm (fixed) | | **Output Type** | PNP Open-Collector | | **Output Operation** | Dual (Light-ON / Dark-ON) | | **Supply Voltage** | 5 to 24 V DC ±10% | | **Current Consumption** | 15 mA or less | | **Response Time** | 20 µs or less under light received | --- ### 2. Internal Electronic Components The sensor functions as a self-contained optical switch consisting of two primary internal circuits: #### A. The Emitter (Infrared LED) * **Component:** A Gallium Arsenide (GaAs) Infrared LED. * **Function:** It emits an invisible beam of light across the 5mm slot. * **Peak Wavelength:** Usually around 880nm. #### B. The Receiver (Photo IC) * **Component:** A phototransistor combined with a signal processing IC. * **Function:** It converts the light into an electrical signal. The "P" in the model number signifies **PNP output**, meaning the load is connected between the output wire and the negative terminal (0V). --- ### 3. Wiring and Connection Diagram The PM-R64P typically features a 4-pin connector or cable. The internal circuitry allows for two modes of operation depending on how you wire the "L" (Control) terminal. ```mermaid graph LR VCC[+V / Brown] --- Sensor[PM-R64P] OUT[Output / Black] --- Load GND[0V / Blue] --- Sensor L[Control / Pink] --- ModeSelection ``` * **Brown:** +V (5-24V DC) * **Blue:** 0V (GND) * **Black:** Output (PNP) * **Pink (L):** Mode selection. Connecting to +V or leaving it open toggles between **Light-ON** and **Dark-ON**. --- ### 4. Physical Form Factor: "R" Shape The **"R"** in PM-R64P refers to the physical orientation of the sensor. * **Shape:** It is a "U" shaped sensor where the mounting holes are positioned at a right angle relative to the sensing axis. * **Advantage:** This allows for compact vertical mounting in tight mechanical assemblies, such as inside a printer or a robotic arm. ---