GTU BE 2020 Summer Question Papers || Gujarat Technological University
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Seat No.:
Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI EXAMINATION — SUMMER 2020
Subject Code: 2161709
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Subject Name: Programmable Logic Controller
Time: 10:30 AM TO 01:00 PM
Date: 29/10/2020
Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | MARKS |
|---|---|
| (a) List 3 companies which manufacture PLC | 03 |
| (b) List out 4 sensors/devices which can be used as digital inputs. | 04 |
| (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 EEPROM | 04 |
| (c) Write a PLC ladder program for level control of tank (i.e. empty and fill the tank) using latch/unlatch instruction and without using latch/unlatch instruction. | 07 |
OR
| Q.2 | |
|---|---|
| (c) Three conveyors fed a main conveyor. The count from 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. | 07 |
| Q.3 | |
|---|---|
| (a) Prepare a ladder logic for the following statement: Switch 8 and Switch 11, plus either switch 22 or switch 34, must be on for output 67 to be on. | 03 |
| (b) Draw a neat circuit diagram of PLC input module | 04 |
| (c) Explain in detail timing diagram and application of On delay timer | 07 |
OR
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| Q.3 | |
|---|---|
| (a) Make a ladder diagram for the following sequence: When SW1 is closed, CR1 goes on. After CR1 goes on, SW2 can turn CR2 on. When CR2 goes on, PL1 goes off. | 03 |
| (b) Draw a neat circuit diagram of PLC output module | 04 |
| (c) Explain in detail timing diagram and application of Off delay timer | 07 |
| Q.4 | |
|---|---|
| (a) Explain how JUMP instructions differs from the SKIP and MCR Functions. | 03 |
| (b) Explain up counter | 04 |
| (c) Write a ladder program to turn light on only if a PLC counter has a value of 45 or 78. | 07 |
OR
| Q.4 | |
|---|---|
| (a) Write a Ladder program to convert any binary number to BCD. | 03 |
| (b) Explain down counter | 04 |
| (c) Write a ladder program to transfer data in 7 registers starting from IR0100 to other 7 holding register starting from HR0200. | 07 |
| Q.5 | |
|---|---|
| (a) Prepare ladder logic to implement AND, OR and NOT logic gates | 03 |
| (b) Describe various levels of industrial control | 04 |
| (c) Explain in detail application of sequencer function to control Dishwasher | 07 |
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 of PLC | 04 |
| (c) Draw and explain the block diagram of PID module and explain various PID tuning methods. | 07 |
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