Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 8th Sem New 2182001 Programmable Logic Controllers Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2182001 Date: 26/11/2018
Subject Name: Programmable Logic Controllers
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.
MARKS
Q.1 (a) Justify the statement: ?PLC is an industrial computer.? 03
(b) Explain remote I/O module for PLC. Also state advantages of
remote I/O.
04
(c) Draw block diagram of PLC. Explain all the major components of
PLC in detail.
07
Q.2 (a) Give ladder diagrams for the following logic gates.
(i) Two input AND gate
(ii) Two input EX-OR gate
(iii) Two input NOR gate
03
(b) Give FBD program for the following Boolean expression
Where A,B,C and D are digital inputs and Y is digital output
04
(c) Using suitable diagrams, explain AC input card for PLC. 07
OR
(c) Draw the external wiring diagram and give ladder program for 3-
phase induction motor control in forward and reverse direction.
07
Q.3 (a) Explain latching relay instruction used in PLC programming. 03
(b) Give instruction list (IL) program for the following system.
When START push button is pressed momentarily, an output X will
turn ON. If another push button is pressed momentarily while X is
on, another output Y will turn ON. When STOP push button is
pressed momentarily, only X will turn OFF. Y can be turned OFF
by separate push button only if X is off.
04
(c) When a system is controlled by PLC, explain safe STOP and non
safe STOP for the system (failsafe operation). Explain using both
hardware and PLC program
07
OR
Q.3 (a) Using suitable diagram, explain UP counter instruction in PLC. 03
(b) There are three machines. Each machine has a separate start and
stop pushbuttons. Only one machine should run at a time. Develop
PLC FBD to control this operation.
04
(c) A temperature control system of a liquid is to be controlled using
PLC. When heater is on, temperature of the liquid will increase and
when the heater is off, the liquid will get cooled naturally. If the
temperature of the liquid is below 50?C, heater should turn on and
when the temperature reaches 80?C, the heater should turn off. The
heater should remain in off condition until temperature falls below
50?C. Design and draw PLC ladder diagram. Assume suitable
temperature sensor and other interlocks
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2182001 Date: 26/11/2018
Subject Name: Programmable Logic Controllers
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.
MARKS
Q.1 (a) Justify the statement: ?PLC is an industrial computer.? 03
(b) Explain remote I/O module for PLC. Also state advantages of
remote I/O.
04
(c) Draw block diagram of PLC. Explain all the major components of
PLC in detail.
07
Q.2 (a) Give ladder diagrams for the following logic gates.
(i) Two input AND gate
(ii) Two input EX-OR gate
(iii) Two input NOR gate
03
(b) Give FBD program for the following Boolean expression
Where A,B,C and D are digital inputs and Y is digital output
04
(c) Using suitable diagrams, explain AC input card for PLC. 07
OR
(c) Draw the external wiring diagram and give ladder program for 3-
phase induction motor control in forward and reverse direction.
07
Q.3 (a) Explain latching relay instruction used in PLC programming. 03
(b) Give instruction list (IL) program for the following system.
When START push button is pressed momentarily, an output X will
turn ON. If another push button is pressed momentarily while X is
on, another output Y will turn ON. When STOP push button is
pressed momentarily, only X will turn OFF. Y can be turned OFF
by separate push button only if X is off.
04
(c) When a system is controlled by PLC, explain safe STOP and non
safe STOP for the system (failsafe operation). Explain using both
hardware and PLC program
07
OR
Q.3 (a) Using suitable diagram, explain UP counter instruction in PLC. 03
(b) There are three machines. Each machine has a separate start and
stop pushbuttons. Only one machine should run at a time. Develop
PLC FBD to control this operation.
04
(c) A temperature control system of a liquid is to be controlled using
PLC. When heater is on, temperature of the liquid will increase and
when the heater is off, the liquid will get cooled naturally. If the
temperature of the liquid is below 50?C, heater should turn on and
when the temperature reaches 80?C, the heater should turn off. The
heater should remain in off condition until temperature falls below
50?C. Design and draw PLC ladder diagram. Assume suitable
temperature sensor and other interlocks
07
2
Q.4 (a) Using timing diagram, explain retentive on delay timer instruction
in PLC.
03
(b) Develop PLC ladder diagram to multiply two numbers stored in
some PLC registers. Store the result in one of the PLC registers.
04
(c) Write a short note on distributed control system using PLC. 07
OR
Q.4 (a) Using timing diagram, explain off delay timer instruction in PLC. 03
(b) Explain conditional JUMP operation in PLC. 04
(c) Explain various arithmetic instructions in PLC. 07
Q.5 (a) Explain data MOVE function in PLC. 03
(b) Using ladder example, explain any two number comparison
instructions in PLC.
04
(c) Explain all the factors to be taken care while commissioning a PLC. 07
OR
Q.5 (a) Explain SKIP function in PLC. 03
(b) Explain various registers in PLC. 04
(c) When a new PLC is required to be purchased to control a large
system, which specifications are to be listed for the PLC order?
Explain all of them in detail.
07
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This post was last modified on 20 February 2020