GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VI (NEW) EXAMINATION - WINTER 2020
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Subject Code:2161709 Date:29/01/2021Subject Name:Programmable Logic Controller
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Compare PLC over relay based system. 03
(b) Draw the block diagram of PLC. 04
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(c) Explain PLC scanning with suitable diagram. 07Q.2 (a) List out analog input and output devices which can be connected with 03
PLC.
(b) Develop the ladder diagram for AND , NOR gate. 04
(c) Explain discrete input output module of PLC. 07
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Q.3 (a) Implement the ladder diagram for Output A is On after 10 second of 03
push button B is pressed.
(b) Explain PLC Multiplication function with suitable example. 04
(c) Explain ON Delay timer (Ton) with timing diagram and suitable 07
example.
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Q.4 (a) Develop a ladder diagram for A output is on if count value is more 03
than 10.
(b) Explain PLC addition function with ladder diagram. 04
(c) Explain UP and Down counter of PLC with suitable application. 07
Q.5 (a) List PLC programming languages. 03
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(b) List out PLC Number Comparison Functions. Explain any two with 04suitable example.
(c) What is the importance of SKIP and MCR functions of PLC explain 07
with suitable application.
Q.6 (a) List various shifting and rotating functions available in PLC. 03
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(b) Explain jump instruction of PLC. 04(c) Explain basic two axis robot with PLC sequencer control. 07
Q.7 (a) Describe holding register of PLC. 03
(b) Explain the PID control using PLC. 04
(c) Write short note on “Preventive maintenance of PLC”. 07
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Q.8 (a) Explain BIT SET instruction with example. 03
(b) Explain TABLE TO REGISTER and REGISTER TO TABLE 04
function of PLC.
(c) List out factors to be considered for selecting PLC 07
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