ESET 225 PLC/Pneumatic Interfacing Agenda
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Questions and Answers

What type of processing tasks are functions designed to perform?

  • Math and Trig operations (correct)
  • Data storage operations
  • Graphics rendering operations
  • Signal processing operations

    • What characteristic makes function blocks equivalent to special purpose ICs?

  • Contain only data
  • Can keep track of past data (correct)
  • Produce graphical results
  • Are used for user-defined operations

    • What is the primary advantage of Sequential Function Charts over other function block diagram types?

  • Incorporates advanced trigonometric functions
  • Ability to mix other types of languages (correct)
  • Specifically designed for user-defined tasks
  • Detailed graphical representation

    • What is one of the benefits of implementing IEC 1131-3?

    <p>Enhanced software reusability</p> Signup and view all the answers

    Which of the following is NOT a term associated with any process according to the passage?

    <p>Desired value</p> Signup and view all the answers

    What is the main purpose of process control according to the passage?

    <p>Both a and b</p> Signup and view all the answers

    In manual control, what does the operator do to achieve the desired value or set point of the controlled variable?

    <p>Visually inspect the indicator and manipulate a flow into the process</p> Signup and view all the answers

    What is the main purpose of feedback control?

    <p>All of the above</p> Signup and view all the answers

    What is the definition of a 'process' according to the passage?

    <p>A process consists of an assembly of equipment and material that relates to some manufacturing sequence</p> Signup and view all the answers

    What is the difference between manual control and feedback control according to the passage?

    <p>In manual control, the operator visually inspects the indicator and manipulates the process, while in feedback control, sensors measure the actual values and the control hardware automatically compares and calculates</p> Signup and view all the answers

    Which of the following is NOT an element of a control system according to the passage?

    <p>Desired value</p> Signup and view all the answers

    According to the passage, which of the following is NOT a term associated with any process?

    <p>Set point</p> Signup and view all the answers

    What does the variable 'y' represent in the formula y=mx+b?

    <p>The analog signal after conversion, which is the output</p> Signup and view all the answers

    How is the slope 'm' calculated in the given example?

    <p>m = (7500 - 4000) / (50 - 0)</p> Signup and view all the answers

    What is the value of the constant 'b' in the given example?

    <p>57.14</p> Signup and view all the answers

    What are the two defined points used to calculate the slope 'm' and the constant 'b' in the given example?

    <p>(0 PSI, 4000) and (50 PSI, 7500)</p> Signup and view all the answers

    What is the purpose of the CPT instruction mentioned in the text?

    <p>To convert the analog input signal from the sensor to a meaningful unit</p> Signup and view all the answers

    What is the final equation that should be entered into the CPT instruction, based on the given example?

    <p>y = 0.0142x + 57.14</p> Signup and view all the answers

    What units are the input and output values of the CPT instruction expected to be in, based on the given example?

    <p>The input is a dimensionless value, and the output is in PSI</p> Signup and view all the answers

    What is the significance of using the CPT instruction with the y=mx+b formula in the context of analog signal conversion or scaling?

    <p>It allows for converting the analog input signal to a more meaningful unit, such as PSI, for better understanding and interpretation</p> Signup and view all the answers

    What is the primary purpose of analog outputs in a Programmable Logic Controller (PLC)?

    <p>To convert 16-bit integer values into voltage or current signals for external devices</p> Signup and view all the answers

    Why is it necessary to convert analog signals received by a PLC into a more meaningful format?

    <p>The integer values representing analog signals have no inherent meaning without conversion</p> Signup and view all the answers

    Which mathematical equation is commonly used for converting analog signals in a PLC?

    <p>$y = mx + b$</p> Signup and view all the answers

    What is the purpose of the CPT (Compute) instruction in a PLC program?

    <p>To evaluate user-defined equations and store the result in a destination file</p> Signup and view all the answers

    Under what condition will the CPT instruction generate an output in a PLC program?

    <p>When all input conditions on the rung are true</p> Signup and view all the answers

    Which of the following statements is true regarding the use of the CPT instruction in a continuous analog signal conversion application?

    <p>The CPT instruction should be placed on a rung that is always true (continuously enabled)</p> Signup and view all the answers

    What is the purpose of scaling factors ($m$ and $b$) in the analog signal conversion equation $y = mx + b$?

    <p>To convert the analog signal from one physical unit to another (e.g., PSI to Bar)</p> Signup and view all the answers

    Which of the following statements best describes the role of analog inputs and outputs in a PLC system?

    <p>Analog inputs and outputs are used to interface the PLC with analog devices and systems</p> Signup and view all the answers

    What does the acronym 'SCP' stand for in the context of PLC programming?

    <p>Scale with Parameters</p> Signup and view all the answers

    What is the primary purpose of the IEC 61131-3 standard?

    <p>To standardize programming languages and interfaces for PLCs</p> Signup and view all the answers

    Why was the IEC 61131-3 standard developed?

    <p>To reduce the costs associated with hardware, software, and training</p> Signup and view all the answers

    What advantage is mentioned in the text regarding the use of IEC 61131-compliant PLCs and programming systems?

    <p>Portability across platforms and use of same concepts</p> Signup and view all the answers

    What was the result of the variety of concepts used in industrial automation before the IEC 61131-3 standard?

    <p>Incompatibility between systems on different PLC platforms</p> Signup and view all the answers

    What is mentioned as an advantage of the IEC 61131-3 standard in the text?

    <p>Worldwide support independent of any single company</p> Signup and view all the answers

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