LogixPro PLC Lab Manual for Programmable Logic Controllers
LogixPro PLC Lab Manual for Programmable Logic Controllers
5th Edition
ISBN: 9781259680847
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
Question
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Chapter 3, Problem 2P
Program Plan Intro

a.

Converting decimal numbers to binary numbers:

  • It is given that an encoder circuit is used for converting decimal numbers into binary numbers.
  • The output status of the encoder is stated as HIGH and LOW.

The truth table for the given encoder circuit is shown below.

Decimal numbersDCBA
0LLLL
1LLLH
2LLHL
3LLHH
4LHLL
5LHLH
6LHHL
7LHHH
8HLLL
9HLLH

Explanation of Solution

b.

Output status when 5 is pressed:

  • Consider that the decimal number 5 is pressed on the keyboard.
  • From the table given above, the corresponding encoded output to decimal number 5 is given below.

Explanation of Solution

c.

Output status when 7 is pressed:

  • Consider that the decimal number 7 is pressed on the keyboard.
  • From the table given above, the corresponding encoded output to decimal number 7 is given below.

Explanation of Solution

d.

Output status when 8 is pressed:

  • Consider that the decimal number 8 is pressed on the keyboard.
  • From the table given above, the corresponding encoded output to decimal number 8 is given below.

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