January 6, 2012

Programmable Logic Controllers JNTU previous years question papers

Programmable Logic Controllers JNTU previous years question papers

Time: 3hours
Max. Marks: 80
Answer any FIVE questions

All Questions Carry Equal Marks

1.a) Draw the schematic of input modules of PLC.
b) Discuss about the programming formats of PLC. [16]

2.a) Explain about typical PLC input devices.
b) Construct a schematic PLC ladder diagram for a pump motor which require two separate Start-Stop-Jog control stations. [16]

3.a) Explain the following
i) NAND gate and relay and PLC equivalents.
ii) NOT gate and relay and PLC equivalents.
b) Make a schematic of a ladder diagram for 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
(Use nine step planning sequence) [16]

4.a) What are the characteristics of PLC registers?
b) Discuss about the following:
i) Input Registers (single and group)
ii) Addressing format of Allem Bradley PLC. [16]

5.a) Explain different types of PLC arithmetic functions.
b) Explain the use of SUBTRACT function for conveyor count application with neat schematic. [16]

6.a) How JUMP differs from SKIP and MCR functions.
b) Explain the operation of PLC TABLE AND REGISTER MOVE. What is its significance when compared to other MOVE operations? [16]

7.a) What is the significance of Cascaded sequencers in PLC programming? Explain.
b) Explain operation of Industrial three axis robot control. [16]

8. Write short notes on
a) ONS and CLR functions b) PLC analog modules c) PID modules. [16]



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