The **FUD-B3-R/Q** is a specific series within the family of **Photoelectric Fork Sensors** (often referred to as Slot Sensors or U-frame sensors), commonly used in industrial automation for label detection, edge guiding, or object counting. Below is an explanation of its electronic components, specifications, and internal logic. --- ### 1. Core Technical Specifications The device operates using high-frequency infrared or visible light beams to detect the presence or absence of a material within its "slot." | Component/Feature | Specification Details | | :--- | :--- | | **Supply Voltage** | Typically 12-24V DC | | **Current Consumption** | < 30mA | | **Response Time** | High speed, often < 500μs | | **Output Type** | NPN or PNP (Open Collector) | | **Output State** | Selectable: Light-ON (L) or Dark-ON (D) | | **Sensitivity** | Adjustable via multi-turn potentiometer | --- ### 2. Electronic Internal Architecture The sensor consists of four primary electronic stages: 1. **Emitter (Transmitting Side):** Contains an Infrared LED that pulses light at a specific frequency to avoid interference from ambient shop-floor lighting. 2. **Receiver (Phototransistor):** Located directly opposite the emitter. It converts the received light intensity into a small electrical current. 3. **Comparator & Logic Circuit:** This internal IC compares the signal from the receiver against a "threshold" set by the user (the sensitivity adjustment). 4. **Output Driver:** A transistor-based switch (NPN or PNP) that handles the load connection to a PLC or controller. --- ### 3. Wiring and Interface (Standard R/Q Models) Most FUD series sensors use a standard 3-wire or 4-wire configuration. ```markdown - Brown Wire: Positive Power (+V / 12-24VDC) - Blue Wire: Negative/Ground (0V) - Black Wire: Control Output (Signal) - White Wire: Mode Selection (L-ON/D-ON toggling) ``` --- ### 4. Key Functional Features * **Sensitivity Potentiometer:** Usually located on the top of the "B3" housing. It allows the user to tune the sensor to ignore backing paper while detecting the label. * **Stability Indicators:** * **Green LED:** Indicates power stability and alignment. * **Red/Orange LED:** Indicates that the output has been triggered. * **Rugged Housing:** The "B3" designation often refers to a specific U-shaped frame width (e.g., 30mm or 3mm slot depending on the specific sub-brand catalog), designed for mounting on vibrating machinery. --- ### 5. Application Context The "R/Q" suffix usually denotes specific output logic: * **R:** Often signifies a specific Connector Type or Reverse logic protection. * **Q:** Generally indicates a "Quick-disconnect" M8 or M12 connector interface rather than a fixed flying lead cable. ---