Automating Manufacturing Systems - Process Control and ...

plc boolean - 6.22
A = ( S⋅
M⋅
W) + ( S ⋅ M⋅
W) + ( S ⋅M ⋅W)
∴A
= S⋅
( M⋅
W+ M⋅
W+
M⋅
W)
∴A
= S⋅
(( M⋅
W+
M⋅
W) + ( M⋅
W+
M ⋅ W)
)
∴A
= ( S⋅
W) + ( S ⋅ M)
= S⋅
( W+
M)
W
W
(S*W)
(S*W)+(S*M)
S
A
M
(S*M)
M
S
W S A
Figure 6.21
A Boolean Equation and Implementation for the Alarm
The equation and circuits shown in Figure can also be further simplified, as shown
in Figure 6.22.