Automating Manufacturing Systems - Process Control and ...

plc boolean - 6.18
Solution:
D = A+ ( B ⊕ C)
A
D
B
C
B
C
Figure 6.16
Sample Solution for Logic Case Study B
6.5.2 Car Safety System
Problem: Develop Ladder Logic for a car door/seat belt safety system. When the
car door is open, and the seatbelt is not done up, the ignition power must not be applied. If
all is safe then the key will start the engine.
Solution:
Door Open Seat Belt Key
Ignition
Figure 6.17
Solution to Car Safety System Case
6.5.3 Motor Forward/Reverse
Problem: Design a motor controller that has a forward and a reverse button. The
motor forward and reverse outputs will only be on when one of the buttons is pushed.
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