The **PM-R24-R** is a subminiature, U-shaped photoelectric sensor (also known as a photointerrupter) manufactured by Panasonic (formerly Sunx). It is widely used in industrial automation for position sensing, limit detection, and counting. --- ### 1. Technical Specifications The following table summarizes the key electronic and physical characteristics of the PM-R24-R: | Feature | Specification | | :--- | :--- | | **Sensing Method** | Thru-beam (U-shaped) | | **Slot Width** | 5 mm | | **Supply Voltage** | 5 to 24 V DC ±10% | | **Output Type** | NPN Open-collector | | **Output Operation** | Dual Output (Light-ON / Dark-ON) | | **Current Consumption** | 15 mA or less | | **Response Time** | 20 µs or less (under specific conditions) | | **Indicator** | Orange LED (lights up when sensing) | | **Cable Type** | 1m Flexible Robot Cable (R-type) | --- ### 2. Internal Electronic Components The device operates using three primary electronic stages: 1. **Infrared Emitter:** An internal GaAs (Gallium Arsenide) Infrared LED that emits a beam across the 5mm gap. 2. **Receiver (Phototransistor):** A high-speed silicon phototransistor that detects the presence or absence of the IR beam. 3. **Output Logic Circuit:** Integrated circuitry that processes the signal and provides two separate NPN outputs: * **Light-ON:** Conducts when the beam is NOT blocked. * **Dark-ON:** Conducts when an object is present in the slot. --- ### 3. Wiring Diagram (Electronic Interface) The PM-R24-R uses a 4-wire configuration to provide flexibility in logic. | Wire Color | Function | Connection Description | | :--- | :--- | :--- | | **Brown** | +V | Positive power supply (5-24V DC) | | **Blue** | 0V | Ground / Common | | **Black** | Output 1 | Light-ON (NPN Output) | | **White** | Output 2 | Dark-ON (NPN Output) | > **Note:** As an NPN open-collector output, you must connect the load between the Output wire and the Positive (+V) terminal. --- ### 4. Key Features of the "R" Variant The **"R"** suffix in the part number denotes that this model is equipped with a **flexible robot cable**. This makes it electronically and mechanically superior for applications involving: * Moving arms or robotic joints. * High-vibration environments. * Tight bending radii where standard PVC cables might crack or fail.