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2007 Anna University Chennai B.E Mechatronics Engineering Programmable Logic Control Question paper

University Question Papers
2007 Anna University Chennai B.E Mechatronics Engineering Programmable Logic Control Question paper
B,E. MECHATRONICS ENGINEERING
PROGRAMMABLE LOGIC CONTROL
MAX:100

PART A-(10*2=20)

1. State the Programming methods of PLC.

2. Define Programmable logic Controller.

3. State the three part of PLC Scanning.

4. State the difference between EPROM and EEPROM.

5. Sketch the timing diagram for ON Delay timer.

6. Draw the relay programming and PLC Programming equivalents for
two input AND and NOT gate.

7. Draw the flow chart symbols.

9. Draw the Ladder diagram for double – input timer.

10. List any four factors to be considered in selecting a PAC. PART-B(5*16=80)

11. (a) Explain the principle of operation of PLC with block diagram & How FPGA s differs from other PLDs?

(Or)

(b) Design a sequential Traffic light controller for the intersection of “A” street (main street) and “B” street. Each street has traffic sensors which detect the presence of vehicles approaching or stopped at the intersection , “A” street has a green light until a car approaches on “B”. street and none on “A” in which case the “B” cycle is extended 10 more seconds. When “A” is green , it remains green at least 60 seconds. And then the light change only when a car can approach on “B”. Develop the block diagram , state graph and state table for the above requirement.
12. Explain the input and output modules of PLC

(Or)

Explain the power supplies modules of the PLC.& With the block diagram explain the CPU Processor Module.

13(a) With a suitable elementary diagram Screen pattern and connection diagram explain

(i) Simple one-switch , one coil control. (ii). Standard Start –stop seal Circuit.

(Or)

(b) What is the need for Latching?

Design a PLC Program and prepare a typical I/O connection diagram and Logic ladder program for a start – stop – jog Circuit.

14 (a) Explain in detail about the steps in planning a program for a large process ladder diagram Construction.

(Or)

(b) Develop a PLC program for a Heat /Quench station which makes use of Timer /Counter functions which undergoes surface- hardening , heating in to high temperature and immediate Quenching process.

15 (a) A wood saw W and Fan F and lubrication Pump P, all go on when a start button is pushed A stop button stops the saw only . The fan is to run additional 5 sec to blow the chips away. The Lube pump is to run more than 8 sec after shut down of W. Additionally if the saw has to run more then one minute the fan should stay on indefinitely. The fan may then be turned off by pushing a separate fan reset button. If the saw has run less than one minute the pump should go off when the saw is turned off.

(Or)

(b) Develop PLC program for the following bottling process for 12 bottles.
• Bottles are counted until oil 12 are in position for filling
• When in position in the carton, the bottles which are 12 in number are filled simultaneously for 6.3 sec.
• After filling , there is a pause of 3.8 sec for foam to subside.
• The 12 caps are then put on and counted as they are installed.
• A solenoid then pushes the completed carton of 12 on to a conveyer.
• The system is reset for a new group (to be restarted manually )of 12 bottles by a limit switch that indicates that the carton is out of the “FILL “ position and on the conveyor.