plc boolean - 6.37
A + D B + C |
A |
B |
C |
D |
B |
C |
C |
D |
A |
B |
D |
B |
A |
C |
6.9 ASSIGNMENT PROBLEMS
1. Simplify the following Boolean equation and implement it in ladder logic.
X= A + BA + BC + D + C
2.Convert the following ladder logic to a Boolean equation. Simplify the equation using Boolean
plc boolean - 6.38
algebra, and then convert the simplified equation back to ladder logic.
C A B D
X
B A
DD
3.Use Boolean equations to develop simplified ladder logic for the following truth table where A, B, C and D are inputs, and X and Y are outputs.
A |
B |
C |
D |
X |
Y |
|
|
|
|
|
|
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
1 |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
1 |
1 |
1 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
1 |
0 |
1 |
0 |
1 |
1 |
0 |
0 |
1 |
0 |
1 |
1 |
1 |
0 |
1 |
1 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
1 |
1 |
0 |
1 |
0 |
1 |
0 |
0 |
0 |
1 |
0 |
1 |
1 |
1 |
0 |
1 |
1 |
0 |
0 |
0 |
0 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
|
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|
plc boolean - 6.39
4. Convert the truth table below to a Boolean equation, and then simplify it. The output is X and the inputs are A, B, C and D.
A |
B |
C |
D |
X |
|
|
|
|
|
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
1 |
1 |
1 |
0 |
1 |
0 |
0 |
0 |
0 |
1 |
0 |
1 |
0 |
0 |
1 |
1 |
0 |
0 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
1 |
0 |
1 |
0 |
1 |
0 |
0 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
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5.Simplify the following Boolean equation. Convert both the unsimplified and simplified equations to ladder logic.
X = ( ABC) ( A + BC)