The **PM-F24-R** is a micro photoelectronic sensor (photointerrupter) manufactured by Panasonic (formerly Sunx). It is designed for high-reliability detection in automation, utilizing an infrared LED and a phototransistor. --- ## 1. Core Technical Specifications The following table summarizes the primary electrical and physical characteristics of the PM-F24-R. | Feature | Specification | | :--- | :--- | | **Sensing Type** | Through-beam (U-shaped) | | **Sensing Distance** | 5 mm (fixed) | | **Supply Voltage** | 5 to 24 V DC ±10% | | **Current Consumption** | 15 mA or less | | **Output Type** | NPN Open-collector transistor | | **Output Mode** | Dual: Light-ON / Dark-ON | | **Response Time** | 20 µs or less (under light received condition) | | **Cable Type** | Flexible R-type (High-flexibility cable) | --- ## 2. Electronic Component Breakdown ### A. The Optical Pair The unit consists of two main electronic elements housed in the "U" shaped plastic casing: 1. **Emitter (Infrared LED):** Emits a beam of infrared light across the 5mm gap. 2. **Receiver (Phototransistor):** Detects the presence or absence of the IR beam. When an object enters the slot, it blocks the beam, changing the state of the transistor. ### B. The "R" Designation (Flexible Cable) The **-R** suffix is a critical electronic distinction. It indicates that the sensor is equipped with a **cabling-resistant (flexible)** wire. * Standard cables may crack under repeated movement. * The R-type cable uses high-strand count wiring, making it ideal for installation on moving parts like robotic arms or sliding carriages. ### C. Output Circuitry (NPN) The sensor uses an **NPN Open-Collector** output. * **Light-ON:** The output is active when the beam is not blocked. * **Dark-ON:** The output is active when an object is blocking the beam. * The dual-output design allows for flexible integration into various logic controllers (PLCs) or microcontrollers. --- ## 3. Wiring Diagram Logic The PM-F24-R typically features four wires: 1. **Brown:** Plus (+V) - Connects to 5-24V DC. 2. **Blue:** 0V (GND). 3. **Black:** Output 1 (e.g., Light-ON). 4. **White:** Output 2 (e.g., Dark-ON). ```mermaid graph LR A[Power 5-24V] -->|Brown| B(PM-F24-R) C[GND] -->|Blue| B B -->|Black| D[Load/PLC Input] B -->|White| E[Alternative Logic] ``` --- ## 4. Key Advantages * **Small Footprint:** Compact "F" shape saves space in tight mechanical assemblies. * **Immune to Interference:** Internal circuitry is designed to minimize the effects of ambient light. * **High Speed:** The 20 µs response time allows for accurate counting or positioning in high-speed machinery.