This download link is referred from the post: PTU B.Tech Question Papers 2020 March (All Branches)
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Roll No. Total No. of Pages : 02
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Total No. of Questions : 09B.Tech.(EE) PT (Sem.=7)
MICROCONTROLLER AND PLC
Subject Code : BTEE-604
M.Code : 74092
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Time : 3 Hrs. Max. Marks : 60INSTRUCTIONS TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.
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SECTION-A
Q1 Answer briefly :
- Differentiate between a microcontroller and a microprocessor.
- What is an embedded system?
- What is criterion for choosing a microcontroller for a particular application?
- If bank 1 registers are being used, the default value of the stack pointer cannot be used. Why?
- What is the difference between a machine cycle and a clock cycle?
- Differentiate between the packed and unpacked BCD numbers.
- What is checksum byte?
- Define a programmable logic controller.
- Lists are the factors affecting the memory size needed for a particular PLC.
- List all the programming languages of a PLC.
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SECTION-B
Q2 Contrast and compare the different addressing modes of 8051 microcontroller with suitable examples.
Q3 Create a square wave with an ON time 2ms and an OFF time of 10ms on all pins of port 0. Assume an XTAL of 22MHz.
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Q4 List and explain the registers of 8051 having the bit-addressability. What are the advantages of bit-addressability?
Q5 Outline and explain the sequence of events involved in a single PLC program scan. “The scan time puts a limit on the speed of events”. Comment.
Q6 Draw the schematic diagram of a discrete input and output module and explain each section.
SECTION-C
Q.7 Devise ladder programs for systems that will carry out the following tasks :
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- Switch on a pump when the water level in a tank rises to above 1.2 m and switch it off when it falls below 1.0 m.
- Switch on a pump; then 100 s later, switch on a heater; then a further 30 s later, switch on the circulating motor.
- Switch on a heater when the temperature is less than the set temperature.
- Turn on a lamp when a data source is not giving 100.
Q8 a) Explain the architecture of the PLC in detail: Define the function of each section.
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b) How the analog devices are interfaced?
Q9 a) What are the advantages of using programmable logic over discrete logic? How does a structured ASIC differ from the traditional ASIC and the PLD?
b) Two switches are connected to the pins P0.1 and P0.2. These are also vectored to interrupt locations 0003H Write a program to test which key is pressed, or to verify if both the keys are pressed.
Write a program to implement an on-off temperature control. Assume a temperature sensor is connected to an input port to read the temperature and a heater to the output port through a relay to control the temperature.
Explain the features of the 8255 chip and its mode selection.
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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
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This download link is referred from the post: PTU B.Tech Question Papers 2020 March (All Branches)