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20.5 DESIGN CASES
20.5.1 Logic Functions
Part A - Develop a program that will cause output D to go true when switch A and switch B are closed or when switch C is closed.
Part B - Develop a program that will cause output D to be on when push button A is on, or either B or C are on.
20.5.2 Car Safety System
Develop Ladder Logic for a car door/seat belt safety system. When the car door is open, or the seatbelt is not done up, the ignition power must not be applied. If all is safe then the key will start the engine.
20.5.3 Motor Forward/Reverse
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. When both buttons are pushed the motor will not work.
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