Interfacing Sensors in Industrial Automation
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Questions and Answers

What is the commonly used range of power supply and operating voltages in industrial automation for sensors and control components?

  • 12–24 V DC and AC (correct)
  • 30–40 V DC and AC
  • 15–30 V DC and AC
  • 5–10 V DC and AC

    • Which standardized signal levels and paths are commonly used for mixing and matching different devices and connections to system interface and control points?

  • 10–50 mA current loops
  • 4–20 mA current loops (correct)
  • 0–5 V voltage loops
  • 2–10 V voltage loops

    • How are sensors and actuators connected to programmable logic controllers (PLCs) in industrial automation?

  • Via ethernet connections only
  • Via wireless connections only
  • Via USB connections only
  • Via I/O ports and modules (correct)

    • What do the modules used for connecting sensors and actuators to programmable logic controllers (PLCs) often include?

    <p>Signal conditioning, level adjustment, provisions for structured industrial wiring, grounding, and safety features</p> Signup and view all the answers

    Which buses may be used to interface already digitized signals in industrial automation?

    <p>I2C (Inter- Integrated Circuit) or SPI (Serial Peripheral Interface)</p> Signup and view all the answers

    What is the commonly standardized signal level used for providing mixing and matching of different devices in industrial automation?

    <p>4–20 mA current loops</p> Signup and view all the answers

    In the context of industrial automation, what is the primary function of a PLC?

    <p>Performing primary signal conversion and processing</p> Signup and view all the answers

    What role do commercial IoT gateways play in the context of existing industrial automation?

    <p>Interfacing with legacy and DCS systems</p> Signup and view all the answers

    What is a characteristic of sensors and actuators in industrial automation systems?

    <p>They may perform internal signal conversions and processing</p> Signup and view all the answers

    What is the purpose of structured wiring in connecting industrial sensors and actuators to PLCs?

    <p>To provide a reliable and organized connection</p> Signup and view all the answers

    What is a benefit of adding IoT to existing industrial automation systems?

    <p>Ability to aggregate process data for holistic view and optimization</p> Signup and view all the answers

    What distinguishes the role of a PLC in industrial automation systems?

    <p>Executing built-in control sequences for local automation and alerting</p> Signup and view all the answers

    How does structured wiring help in connecting industrial sensors and actuators to PLCs?

    <p>It ensures reliable and organized connections</p> Signup and view all the answers

    What is a key role played by commercial IoT gateways in the context of industrial automation?

    <p>Interfacing with legacy and DCS systems</p> Signup and view all the answers

    What distinguishes the function of sensors and actuators in industrial automation systems?

    <p>Some may perform internal signal conversions and processing</p> Signup and view all the answers

    What is the primary function performed by most IoT gateways in existing industrial automation?

    <p>Interfacing with legacy and DCS systems</p> Signup and view all the answers

    Which type of buses are commonly used to communicate digitized outputs in integrated sensors?

    <p>I2C and SPI</p> Signup and view all the answers

    What additional components may stand-alone sensor assemblies use for wireless communication?

    <p>Radios, modems, and communication software</p> Signup and view all the answers

    Which sensors are commonly found in popular personal activity monitors that use Bluetooth Low Energy (BLE) for wireless connection?

    <p>Gyroscope, accelerometer, compass, and altimeter</p> Signup and view all the answers

    What additional ability do smart home thermostats often have in terms of connectivity?

    <p>Connect to the Internet via home Wi-Fi</p> Signup and view all the answers

    As a design choice, what can smart sensors support in IoT systems?

    <p>Standard protocols and connection to any suitable level of hierarchy</p> Signup and view all the answers

    What is the common method used by integrated sensors to reduce the number of signal traces for natively analog measurements?

    <p>Communicating via wired serial buses</p> Signup and view all the answers

    What is the purpose of signal conditioning and amplification circuitry when interfacing raw transducer outputs?

    <p>To match the range of their terminating points and interfaces</p> Signup and view all the answers

    What is the additional circuitry needed for sampling and converting analog signals into digital values?

    <p>Analog-to-digital converter (ADC)</p> Signup and view all the answers

    What is the function of an IoT gateway in the context of industrial automation?

    <p>To connect the IoT system with external networks</p> Signup and view all the answers

    What is the primary role of a programmable logic controller (PLC) in interfacing sensors and actuators?

    <p>To convert analog signals into digital signals</p> Signup and view all the answers

    What do digitized values need to be post-processed for, after being converted from analog signals?

    <p>For converting to engineering units</p> Signup and view all the answers

    Which type of circuitry is typically used to match the range of raw transducer outputs with interfaces, such as 0–5 V for voltage or 4–20 mA for current inputs?

    <p>Signal conditioning and amplification</p> Signup and view all the answers

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