The **FAS-35-R/Q** is a high-performance **Fiber-optic Area Sensor** (often categorized as a light curtain or multi-beam sensor) manufactured by companies like **Azbil (formerly Yamatake)**. These sensors are designed for detection over a wide area rather than a single point. Below is an explanation of its electronic components, specifications, and operating principles. --- ## 1. Core Electronic Specifications The "R/Q" designation usually refers to the output configuration and connection type (e.g., Connector type vs. Cable type, or NPN vs. PNP logic). | Feature | Specification Details | | :--- | :--- | | **Supply Voltage** | 12 to 24V DC (±10% ripple) | | **Current Consumption** | Approx. 50mA to 70mA (Emitter/Receiver combined) | | **Output Type** | Open collector (NPN or PNP depending on specific Q/R suffix) | | **Response Time** | Typically < 5ms to 10ms | | **Light Source** | Infrared LED (modulated for ambient light immunity) | | **Optical Axis Pitch** | 25mm to 35mm (model dependent) | --- ## 2. Electronic Component Breakdown ### A. The Emitter Unit The emitter contains an array of **Infrared LEDs**. * **Driver Circuitry:** Uses a pulse-modulated signal to drive the LEDs. This ensures the receiver can distinguish the sensor's light from ambient factory lighting or welding flashes. * **Synchronization Logic:** Electronic pulses are timed to scan through the optical axes sequentially to prevent cross-talk between beams. ### B. The Receiver Unit The receiver contains a corresponding array of **Phototransistors or Photodiodes**. * **Amplifier Stage:** Converts the minute current generated by the photons into a voltage signal. * **Comparator/Logic Circuit:** Compares the received signal against a threshold. If any single beam (or a specific number of beams) is blocked, the logic state changes. * **Output Transistor:** An internal switching transistor (NPN or PNP) that interfaces with a PLC or relay. ### C. Connection Interface (The R/Q Designators) The suffixes often indicate the electronic interface: * **Connector Type (Q):** Usually features an M8 or M12 quick-disconnect electronic plug. * **Cable Type (R):** Features a fixed multi-core cable (typically 3-wire or 4-wire). --- ## 3. Wiring Configuration Standard electronic wiring for the FAS-35 series usually follows this color code: 1. **Brown:** +V (12-24V DC) 2. **Blue:** 0V (GND) 3. **Black:** Control Output (Switching signal) 4. **Pink (Optional):** Mode selection (Light-ON / Dark-ON) or Synchronization wire. --- ## 4. Key Functional Features * **Cross-Beam Scanning:** Unlike simple sensors, the FAS-35 electronics use a "scan" method where beams are activated in sequence at high speeds. * **Indicators:** The units feature built-in **Diagnostic LEDs** (usually Red for "Operation" and Green for "Stable Light Reception"). * **Mutual Interference Prevention:** Electronic filters allow two sensors to be mounted close together without triggering each other.