52207-mt----programmable Logic Controllers & Their Applications

Code No: 52207/MT

NR

M.Tech. – II Semester Regular Examinations, September, 2008 PROGRAMMABLE LOGIC CONTROLLERS & THEIR APPLICATIONS (Common to Power Electronics & Electric Drives/ Power & Industrial Drives) Time: 3hours

1.a) b) 2.a) b) 3.

Max. Marks:60

Answer any FIVE questions All questions carry equal marks --Explain the architecture of PLC with a neat sketch of block diagram. Discuss briefly about the input analog devices connected PLC input modules. Explain the basic input instruction of a PLC. Explain the procedural steps involved in drill press operation. Draw the ladder diagram for drill press control. Convert the following gate logic to PLC diagram (a) As shown in figure 3a.

Contd….2

Code No: 52207/MT (b)

::2::

As shown in figure 3b.

4.

Explain the various steps in planning a large-process ladder diagram construction.

5.a) b) c)

What are the general characteristics of registers? Explain module addressing. Design, construct and test PLC circuit for a machine M, that is to be turned an either when count A goes up to 11 or when count B goes up to 16. one stop button or switch rests the entire process.

6.a) b)

Explain the master control relay function with an application. Describe a process requiring nesting of two subroutines.

7.a)

Explain the process of controlling a basic two axis Robot with a PLC sequencer. What are the advantages of matrix functions?

b) 8.

What are the types of PLC analog modules & systems? Explain the method of PLC analog signal processing. ******