Programmable Logic Controllers & Micro controller 6th Sem EE May 2018

Duration : 3 Hrs                                                                                                                 M.Marks : 75                                                                                SECTION A

        1. Fill in the blanks :

  1. FBD stands for Function Block Diagram.
  2. Ladder logic has been developed to mimic Relay Logic.
  3. instruction will allow a line to be true only for one scan.
  4. A microcontroller is a 40 Pin Dip Chip
  5. A single ALI stands for 
  6. Numbers of RAM bytes in 8051 are 256 Bytes.
  7. The math flags in PSW are
  8. In 8051 microcontroller, PSEN pin stands for Program Store Enable.
  9. Assembler directives are also called Pseudo Operations.
  10. A program that consists of 0s and 1s is called  Machine Language .
  11. ALP stands for Assembly Language Programming.
  12. 8051 microcontroller has 4KB bytes of ROM.
  13. Instruction…………is used to read data stored in Program.
  14. UART stands for Universal Asynchronous Receiver-Transmitter.
  15. Interrupts which can be controlled are called Handling Interrupts.  
Q2. Attempt any five questions.                                                 5×6=30
  1. What are sequencers? Write various sequencer
  2. Explain the pin diagram of 8051 in detail.
  3. What is assembler? Explain Assembler directives with the help of Examples ?
  4. What are various applications of PLC? Explain any one in
  1. What are interrupts? Explain the types of interrupts ?
  2. Difference between Microprocessor and Micro-controller.
  3. What is PLC? Write Advantages of PLC .
  4. Explain Timer  and its classifications.

Q3. Attempt any three questions.                                                            3×10=30

  1. Explain the addressing modes of 8051
  2. Explain the Functions of different block of PLC with the help of Block Diagram ?
  3. Explain 8051 memory organization in Details ?
  4. What is ladder programming? Write a ladder program to start /stop a motor using single push switch. Green LED glows when motor is ON. Red LED glows when motor is using single push .
  5. Explain interfacing 7-segment displays in detail.
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