PLC Fundamentals Quiz
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Questions and Answers

What is the primary function of a PLC?

  • To execute the user-written program stored in memory (correct)
  • To facilitate faster and less costly duplication of application
  • To provide integrated diagnostic and override functions
  • To continuously monitor the status of connected devices

    • Which component of a PLC is responsible for data manipulation and timing functions?

  • Inputs
  • Execution of the program (correct)
  • Communication Ports (RS-485)
  • Outputs

    • What is the role of communication ports (RS-485) in a PLC?

  • To provide power supply to the PLC
  • To facilitate communication with external devices (correct)
  • To monitor the status of field devices
  • To execute the program stored in memory

    • What is the function of PLC inputs?

    <p>To monitor the status of field devices</p> Signup and view all the answers

    What is a key advantage of PLCs in terms of system changes?

    <p>Easier and faster system changes</p> Signup and view all the answers

    Study Notes

    What is PLC

    • A programmable controller (PLC) is a solid-state device that belongs to the computer family.
    • It stores instructions to implement control functions such as sequencing, timing, counting, arithmetic, data manipulation, and communication.
    • PLCs control industrial machines and processes.

    History of PLC

    • The design criteria for the first programmable controller were specified in 1968 by General Motors Corp.
    • In the 1970s, communication abilities emerged.
    • In the 1980s, standardization on communication protocols occurred.
    • In the 1990s, standardization on programming language took place.

    Prior to PLCs

    • Devices used contactors and relays that were hard-wired together.
    • Circuits had to be designed and drawn up first.
    • Components were specified and installed.
    • Electricians would then wire everything together.

    Advantages of PLC

    • PLCs can perform the same tasks as hard-wired devices.
    • Connections between field devices and relay contacts take place in the PLC.
    • Installation is less extensive with PLCs.
    • PLCs can perform more complex functions than hard-wired devices.

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    Description

    Test your knowledge of Programmable Logic Controllers (PLC) with this quiz covering the history, advantages, and logic of PLC, as well as its input/output elements. See how much you know about this essential component of industrial automation and control systems.

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