The **UDS-C2-R** typically refers to a high-precision, ultrasonic double-sheet detection sensor, often manufactured by companies like **Pepperl+Fuchs**. This electronic device is designed to detect whether zero, one, or two layers of material (like paper or foil) are passing between its sensors. ### 1. Core Electronic Components The system consists of an evaluation unit and two ultrasonic transducers (a transmitter and a receiver). | Component | Function | Key Electronic Detail | | :--- | :--- | :--- | | **Ultrasonic Transmitter** | Converts electrical energy into high-frequency sound waves. | Piezoelectric crystal driven by an oscillator circuit. | | **Ultrasonic Receiver** | Converts the physical sound pressure back into an electrical signal. | High-sensitivity piezoelectric element. | | **Evaluation Unit (CPU)** | Processes the amplitude and phase of the received signal. | Contains a Microcontroller (MCU) and Analog-to-Digital Converters (ADC). | | **Output Stage** | Communicates the status (0, 1, or 2 sheets) to a PLC. | Usually features PNP or NPN transistor outputs. | --- ### 2. Operational Logic The electronic circuitry operates based on the **attenuation of sound**: 1. **Pulse Generation:** The controller sends an electrical pulse to the transmitter. 2. **Transmission:** The transmitter emits an ultrasonic signal (usually around 255 kHz - 400 kHz). 3. **Reception:** * **Air (0 sheets):** High signal amplitude reaches the receiver. * **Single Sheet:** Medium signal amplitude (some energy is reflected/absorbed). * **Double Sheet:** Critically low signal amplitude (significant attenuation). 4. **Logic Switching:** The internal comparator triggers the corresponding output pin based on pre-set thresholds. --- ### 3. Technical Specifications (Typical) The electronics are housed in a ruggedized casing to withstand industrial environments. * **Operating Voltage:** 18 ... 30 V DC (Ripple 10% ss). * **Current Consumption:** Approx. 80 mA. * **Interface:** * **Inputs:** Function input for alignment/learning. * **Outputs:** 3 switching outputs (Short-circuit protected). * **Connection Type:** M12 connector (usually 5-pin or 8-pin depending on the specific sub-model). --- ### 4. Wiring and Pinout (M12 Connector) Electronic integration usually follows this standard logic: | Pin | Wire Color | Assignment | | :--- | :--- | :--- | | 1 | Brown | +UB (Power Supply) | | 2 | White | Output: Double sheet detected | | 3 | Blue | -UB (Ground) | | 4 | Black | Output: Single sheet (Normal) | | 5 | Grey | Function Input (TEACH/Sync) |