University of Anbar PLC Lecture 1: Introduction and History
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Questions and Answers

When were Programmable Logic Controllers first developed?

  • 1970's
  • 1980's
  • 1990's
  • 1960's (correct)
  • What was the main problem with relays that led to the development of PLCs?

  • They were expensive
  • They were bulky
  • They were slow in operation
  • They were mechanical and needed frequent replacement (correct)
  • What improvement was made to PLCs in 1973?

  • Increased ways of programming PLCs
  • Standardization in PLCs
  • Reduced size
  • Ability to communicate between PLCs (correct)
  • What problem did lack of standardization in PLCs create in the 1970's?

    <p>Other problems</p> Signup and view all the answers

    In which decade was the size of PLCs reduced?

    <p>1980's</p> Signup and view all the answers

    What improvement occurred in the 90's for PLCs?

    <p>Increased collection of ways in which a PLC could be programmed</p> Signup and view all the answers

    What is the main advantage of using a microprocessor-based system instead of hardwiring each control circuit for each control situation?

    <p>Flexibility to use the same basic system for all situations</p> Signup and view all the answers

    What does a programmable logic controller (PLC) use to store instructions and implement functions such as logic, sequencing, timing, counting, and arithmetic?

    <p>Programmable memory</p> Signup and view all the answers

    What type of knowledge is required by engineers to operate a programmable logic controller (PLC)?

    <p>Limited knowledge of computers and computing languages</p> Signup and view all the answers

    Which type of devices are connected to the PLC as input and output devices in the system being controlled?

    <p>Sensors and motors/valves</p> Signup and view all the answers

    What does a controller system might be required to do in a control sequence?

    <p>Maintain some variable constant or follow some prescribed change</p> Signup and view all the answers

    What is the purpose of running a motor in a controller system?

    <p>To move an object to some position</p> Signup and view all the answers

    Why are programmable logic controllers (PLCs) designed to be operated by engineers with perhaps a limited knowledge of computers and computing languages?

    <p>To simplify the programming process for non-technical users</p> Signup and view all the answers

    What is one of the main advantages of using a programmable logic controller (PLC) in controlling machines and processes?

    <p>Ability to modify a control system and the rules used with ease</p> Signup and view all the answers

    How do input devices such as sensors and switches interact with a programmable logic controller (PLC)?

    <p>By providing signals that are monitored according to a pre-programmed set of instructions</p> Signup and view all the answers

    What characteristic allows a microprocessor-based system to control a wide variety of situations through changing instructions in the program?

    <p>Flexibility</p> Signup and view all the answers

    What is the role of the central processing unit (CPU) in a PLC?

    <p>It controls and processes all the operations within the PLC.</p> Signup and view all the answers

    What is the function of the address bus in a PLC?

    <p>Sending addresses of locations for accessing stored data</p> Signup and view all the answers

    Which bus is used for communications between the input/output ports and the input/output unit in a PLC?

    <p>System bus</p> Signup and view all the answers

    What determines the operating speed of a PLC and provides timing and synchronization for all elements in the system?

    <p>Clock frequency</p> Signup and view all the answers

    What type of signals are used to carry information within a PLC?

    <p>Digital signals</p> Signup and view all the answers

    What do engineers need to understand to operate a programmable logic controller (PLC)?

    <p>Memory and input/output circuitry</p> Signup and view all the answers

    What is the role of the arithmetic and logic unit (ALU) in the CPU?

    <p>Carrying out arithmetic operations of addition and subtraction</p> Signup and view all the answers

    What is the function of the control unit in the CPU?

    <p>Controlling the timing of operations</p> Signup and view all the answers

    What is the purpose of the address bus in a microprocessor-based system?

    <p>Carrying addresses of memory locations</p> Signup and view all the answers

    What is the function of the control bus in a microprocessor-based system?

    <p>Carrying signals used by the CPU for control</p> Signup and view all the answers

    How is information transmitted in binary form within the PLC?

    <p>In parallel along its own wire</p> Signup and view all the answers

    What type of information does the data bus carry in a microprocessor?

    <p>Data used in processing by the CPU</p> Signup and view all the answers

    What is the purpose of the address bus in a microprocessor-based system?

    <p>To carry the addresses of memory locations</p> Signup and view all the answers

    What does an 8-bit word represent in the context of a microprocessor-based system?

    <p>$2^8$ bits constituting some information</p> Signup and view all the answers

    What is the role of the system bus in a PLC system?

    <p>For communications between input/output ports and input/output unit</p> Signup and view all the answers

    What does an 8-line address bus signify in a microprocessor-based system?

    <p>$2^8$ distinct addresses possible in memory</p> Signup and view all the answers

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