Describe two advantages of a plc based system

Assignment Help Electrical Engineering

Reference no: EM133256610

Programmable Logic Controllers

Assignment Theory

Question 1. (a) By using a truth table or otherwise, show that the expressions below are equivalent

(AB‾ + BC‾ + AC‾)‾ = ABC

(b) Show by plotting truth tables that the following 2 input gates are equivalent to an inverter

Question 2. Draw the logic circuit to represent the following Boolean expression using only two input NAND gates.

F = ((AB.BC‾)‾.(A‾C)‾)‾

Question 3. Write down the Boolean expression for the following ladder diagram. X denotes a switched input, M represents an internal relay contact and Y000 is a motor contact.

683_Boolean expression.jpg

Question 4. (a) Convert the following Hex numbers to binary and add them. Express your final answer in HEX

2A7E + 45CB

(b) Write down the 2's complement of the following binary number

10110000

(c) Convert the following numbers to binary and evaluate using the 2's complement method. Leave your answer in binary form.

68 - 145

(d) Write down the BCD form of decimal 936.

Question 5. Describe two advantages of a PLC based system over a purely relay based one.

Question 6. Referring to the opto-triac output circuit shown below.

2145_Boolean expression1.jpg

Given the following parameters

Logic voltage = 3.3V

D₁ forward voltage drop = 1.8V D₁ operating current = 10mA

Opto-triac minimum operating current 2mA Opto-triac LED forward voltage drop 1.6V

Calculate suitable values for R1 and R2, show all your working.

Question 7. Convert the following circuit diagram to PLC ladder logic, giving full list of I/O and any internal logic used. Describe the operation.

897_Boolean expression2.jpg

Question 8. Explain the basic operation of a PLC scan cycle.

Question 9. (a) Describe the operation of the ladder circuit shown below. The ladder uses the Mitsubishi standard of M for internal relays, Y for external output and T for timer.

770_Boolean expression3.jpg

(b) What type of application could this circuit be used for?

Question 10. What is the difference between opcodes and operands?

Question 11. (a) An A/D conversion has an 8 bit resolution and an input range of 0~5V. A second convertor has an input range of 0~24V and a 10 bit resolution. Calculate the digital output value in Hex that will represent 3V in both cases.

(b) State which of the two convertors in (a) is more accurate and explain why.

Question 12. For the digital to analogue convertor circuit shown below and taking C as the most significant bit, construct a table of all the possible output voltages given a supply voltage of 24 volts. Show all calculations.

1006_Boolean expression4.jpg

Reference no: EM133256610

Questions Cloud

Matching hypothesis and reciprocity : Review the material in chapter 9 related to proximity, mere exposure, similarity, the matching hypothesis and reciprocity.

States of consciousness : xplain why you think it is important for mental health professionals to understand more about this topic.

Write a program that will control the bottling plant : Write a program that will control the bottling plant simulation. The program should be fully documented

Features of all well-designed developmental science : Features of all well-designed developmental science research studies include which one of the following characteristics.

Describe two advantages of a plc based system : Describe two advantages of a PLC based system over a purely relay based one - Calculate suitable values for R1 and R2, show all your working

Erikson stages of development-trust vs. mistrust : On the first stage of Erikson's Stages of Development: Trust vs. Mistrust.

Where do you see evidence of this trait in your behaviors : Where do you see evidence of this trait in your behaviors? What behavior would you like to see?

Empowering idents and haagen-dazs : Describe how groups and/or cultures are presented in Google: Body Type, Dove, Sky Witness: Empowering Idents, Haagen-Dazs:

Explanation of cognitive development : They are arguing about whether the Piagetian or the information-processing perspective offers a better explanation of cognitive development

User Account

All Pages