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    Gujarat Technological University

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    priyank Patel

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    © All Rights Reserved
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    Gujarat Technological University

    Uploaded by

    priyank Patel
    8 views2 pages

    Original Title

    3161714

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    Copyright:

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    8 views2 pages

    Gujarat Technological University

    Uploaded by

    priyank Patel

    Copyright:

    © All Rights Reserved
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    Seat No.: ________ Enrolment No.

    ___________

    GUJARAT TECHNOLOGICAL UNIVERSITY


    BE - SEMESTER–VI (NEW) EXAMINATION – WINTER 2023
    Subject Code:3161714 Date:05-12-2023
    Subject Name:Programmable Logic Controller and Supervisory Control
    and Data Acquisition System
    Time:02:30 PM TO 05:00 PM Total Marks:70
    Instructions:
    1. Attempt all questions.
    2. Make suitable assumptions wherever necessary.
    3. Figures to the right indicate full marks.
    4. Simple and non-programmable scientific calculators are allowed.

    MARKS
    Q.1 (a) What is scan time in PLC? Explain total scan time. 03
    (b) Explain difference between PLC I/O module and RTU. 04
    (c) What is SCADA? Explain it in detail with suitable diagram and 07
    application.

    Q.2 (a) What is the function of PLC input module? 03


    (b) Why electrical isolation is needed in PLC? How it is provided in 04
    PLC? Explain it in brief.
    (c) What is PLC? Explain it in detail with suitable diagram and also 07
    mention its advantages in industrial automation
    OR
    (c) List out various I/O modules of PLC and explain them in detail 07
    Q.3 (a) What is master control relay in PLC? 03
    (b) Explain any four integer mathematical operations in PLC with 04
    program
    (c) Explain timer operation in PLC with proper timing diagram and 07
    program using ladder diagram
    OR
    Q.3 (a) Explain PLC SKIP function with example. 03
    (b) Explain any four logic gate operations in PLC with program. 04
    (c) Explain counter operation in PLC with proper timing diagram and 07
    program using ladder diagram
    Q.4 (a) List out input and output hardware devices used with PLC 03
    (b) Briefly explain special purpose modules in PLC 04
    (c) A block of material is moving on a conveyor belt. 3 position sensors 07
    P1, P2 and P3 are used to sense the position of a block on the belt.
    And 3 lamps L1 ,L2 and L3 are used to indicate particular position of
    the block. When the block reaches at P1, lamp L1 should be ON,
    When it reaches at P2, lamp L1 should be OFF and lamp L2 should
    be ON. When it reaches at P3, lamp L2 should be OFF and lamp L3
    should be ON… Prepare a ladder diagram to implement this logic
    using PLC.
    Also draw a process diagram based on description of the process.
    OR
    Q.4 (a) Explain the concept of threshold detection in PLC input module 03
    (b) Which points are important in the context of maintenance of PLC? 04
    (c) Explain the following mathematical instructions in PLC using ladder 07
    diagram.

    1
    1)Addition 2) Subtraction 3) Multiplication 4) Division
    5) Square Root 6) Sine 7) Cosine
    Q.5 (a) List out any 3 names of vendors of PLC. 03
    (b) Briefly explain PLC MOVE functions. 04
    (c) With suitable diagram explain networking in PLC 07
    OR
    Q.5 (a) List out any 3 names of vendors of SCADA 03
    (b) Briefly Explain analog operations in PLC. 04
    (c) Explain controlling a robot with PLC. 07

    *************

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