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page 253

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.

A

B

D

 

 

 

 

 

 

 

 

 

 

 

C

A

D

B

C

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.

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