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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER -VI • EXAMINATION SUMMER 2018
Subject Code: 3362402 Date: 01-05 2018
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.
4. Use of programmable Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic.
Q.1
Answer any seven out of ten.
14
1.
List any four popular manufacturer of PLC.

PLC
2.
Define half duplex mode.


3.
List two applications of PLC.

PLC
4.
Write advantages of PLC.

PLC
5.
State the area of application for OFF Delay Timer.

OFF Delay Timer
6.
State function of TT bit in Timer.

TT
7.
Write full name of TIA.

TIA
8.
Classify PLC timer.

PLC
9.
Write full name of SCADA.

SCADA
10.
Classify PLC counter.

PLC
Q.2

Write function of ON-Delay Timer and OFF-Delay Timer.
03


ON-Delay Timer OFF-Delay Timer

OR

Write function of retentive and non-retentive timers.
03




Draw the block diagram of PLC.
03

PLC

OR
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Classify PLCs and give number of I/O in each type.
03

PLC I/O


State characteristic function of PLC.
04

PLC

OR

List any eight advantages of PLC.
04

PLC


Give two points in comparison to PC and PLC.
04

PC PLC

OR

Give two points in comparison to DCS and PLC.
04

DCS PLC

Q.3

Draw ladder diagram for AND gate and OR gate.
03
3

AND OR

OR

Draw ladder diagram for NOT gate and XOR gate.
03

NOT XOR


Draw ladder diagram for
03



OR

Draw ladder diagram for
03




Draw ladder diagram for 4 to 1 multiplexer.
04



OR

Draw ladder diagram for Half Adder.
04




Draw a ladder diagram for a two-motor system having the following condition: Starting push button start motor-1, After 10 second motor-2 is ON Stopping the switch stop motor 1 and 2.
04



OR

Draw a ladder diagram for a two-motor system having the following condition: Starting push button start motor-1 for 1 hour and after turning off of motor-1, motor-2 is ON for two hour.
04



Q.4

In a food processing plant, when start switch pressed motor 1,2 turns on for 5,10 seconds respectively. Draw a ladder diagram for this system.
03




OR
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When start, switch pressed, a motor and red lamp turns on. When the stop switch pressed. Motor and red lamp turns off and green lamp turns on. Draw a ladder diagram for this system.
03




Draw block diagram of SCADA system. Write applications, advantages and disadvantages.
04

SCADA

OR

Draw block diagram of DCS system. Write applications and advantages and disadvantages.
04

DCS


Draw a ladder diagram for four motor systems: With push button mechanism When start button press motor 1 should start for period of 1 hour. After motor 1 turns off motor 2 should be started for period of 2 hour. After motor 2 turns off motor 3 should be started for period of 4 hour and After motor 3 turns off motor 4 should be started for period of 5 hour. Process is repeated.
07



Q.5

Explain Ring topology with advantages and disadvantages.
04





Draw ladder diagram for
04




Draw ladder diagram for
03




Give principle of full duplex mode with neat sketch.
03