PROGRAMMABLE LOGIC CONTROLLERS BUNDLE
5th Edition
ISBN: 9781260582475
Author: Petruzella
Publisher: MCG
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Chapter 4, Problem 3P
Program Plan Intro
Logic gate:
- Logic gate is an electronic circuit that is used to perform logic decisions based on the input.
- It contains one or more number of inputs and one output.
- The working of logic gate is based on the binary principle that has two states either logic 0 or logic 1.
- The output of logic gate is produced when it satisfies any of its logic conditions.
- The logic condition depends upon the type of the gates and the number of inputs.
- The primary logic gates include AND, OR, and NOT. The combinations of these gates are used to implement any of the other logic gates.
AND gate:
- The AND gate refers to a logic gate whose output will be HIGH only when all the inputs are HIGH.
- The output of AND gate will be LOW when any one of its input will be LOW.
- The symbol to represent AND gate is given below:
- The truth table for AND gate is as follows:
INPUT A | INPUT B | OUTPUT Y |
0 | 0 | 0 |
0 | 1 | 0 |
1 | 0 | 0 |
1 | 1 | 1 |
NOR gate:
- NOR gate performs the inverse operation of OR gate.
- The NOR gate refers to a logic gate whose output will be HIGH only when all the inputs are LOW.
- The output of NOR gate will be LOW when any one of its input will be HIGH.
- The symbol to represent NOR gate is given below:
- The truth table for NOR gate is as follows:
INPUT A | INPUT B | OUTPUT Y |
0 | 0 | 1 |
0 | 1 | 0 |
1 | 0 | 0 |
1 | 1 | 0 |
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Design a logic circuit with input signal A, control input B, and outputs X and Y to operate as follows:
When B = 1, output X will follow input A, and output Y will be 0.
When B = 0, output X will be 0, and output Y will follow input A.
Design a combinational circuit with four inputs— A, B, C, and D —and one output, F . F is to be equal to 1when A = 1, provided that B = 0, or when B = 1, provided that either C or D is also equal to 1. Otherwise,the output is to be equal to 0.1. Obtain the truth table of the circuit.2. Simplify the output function.3. Draw the logic diagram of the circuit, using NAND gates with a minimum number of ICs.4. Construct the circuit and test it for proper operation by verifying the given conditions.
Designs a logic circuit that will allow a signal to pass to the output only when control inputs B and C are both HIGH; otherwise, the output will stay LOW
Chapter 4 Solutions
PROGRAMMABLE LOGIC CONTROLLERS BUNDLE
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