Download GTU B.Tech 2020 Summer 6th Sem 2161709 Programmable Logic Controller Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 6th Sem 2161709 Programmable Logic Controller Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER? VI EXAMINATION ? SUMMER 2020
Subject Code: 2161709 Date:29/10/2020
Subject Name: Programmable Logic Controller
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.


MARKS
Q.1 (a) List 3 companies which manufacture PLC
03

(b) List out 4 sensors/devices which can be used as digital
04
inputs.

(c) Draw and explain block diagram of PLC
07


Q.2 (a) List out 3 parts of PLC scan cycle.
03

(b) State the full form of ROM, PROM, EPROM and
04
EEPROM

(c) Write a PLC ladder program for level control of tank (i.e.
07
empty and fill the tank) using latch/unlatch instruction and
without using latch/unlatch instruction.


OR


(c) Three conveyors fed a main conveyor. The count from
07
each feeder conveyor is fed into an input register in PLC.
Construct a PLC program to obtain the total count of parts
on the main conveyor. Use a timer to update total count
every 15 seconds.
Q.3 (a) Prepare a ladder logic for the following statement:
03
Switch 8 and Switch 11, plus either switch 22 or switch
34, must be on for output 67 to be on.

(b) Draw a neat circuit diagram of PLC input module
04

(c) Explain in detail timing diagram and application of On
07
delay timer


OR

Q.3 (a) Make a ladder diagram for the following sequence:
03
When SW1 is closed, CR1 goes on. After CR1 goes on,
SW2 can turn CR2 on. When CR2 goes on, PL1 goes off.

(b) Draw a neat circuit diagram of PLC output module
04

(c) Explain in detail timing diagram and application of Off
07
delay timer
Q.4 (a) Explain how JUMP instructions differs from the SKIP and
03
MCR Functions.

(b) Explain up counter
04

(c) Write a ladder program to turn light on only if a PLC
07
counter has a value of 45 or 78.





1

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OR
Q.4 (a) Write a Ladder program to convert any binary number to
03
BCD.

(b) Explain down counter
04

(c) Write a ladder program to transfer data in 7 registers
07
starting from IR0100 to other 7 holding register starting
from HR0200.
Q.5 (a) Prepare ladder logic to implement AND, OR and NOT
03
logic gates

(b) Describe various levels of industrial control
04

(c) Explain in detail application of sequencer function to
07
control Dishwasher


OR
Q.5 (a) List out 3 languages in which PLC can be programmed.
03
(b) List 4 things which are done for preventive maintenance
04
of PLC
(c) Draw and explain the block diagram of PID module and
07
explain various PID tuning methods.

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2

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