1- The CPU system forms the interfaces through which field devices are connected to the controller. True False

2- The programming device must always be connected to the controller to run the program. True False

3- One disadvantage of fixed I/O PLC system is its lack of flexibility. True False

4- The input and output modules execute the user defined program during the scan cycle. True False

5- The central processing unit: A. looks at the inputs, makes the decisions based on the program, and sets the outputs. B. looks at the outputs, makes the decisions based on the program, and sets the inputs. C. serves only to store the program in memory. D. serves only to supply power to the backplane.

6- The programming device: A. is used to enter the program into the memory of the processor. B. is commonly a personal computer. C. can be a hand-held device. D. All of the above.

7- The programming device:

A. is used to enter the program into the memory of the processor. B. is commonly a personal computer. C. can be a hand-held device. D. All of the above.

8- The symbol ---( )--- in a ladder logic diagram represents a: A. set of normally closed ontacts. B. virtual relay coil. C. seal-in contact. D. field input sensing device.

9- The symbol ---| |--- in a ladder logic diagram:

A. can be thought of as a normally open contact. B. represents a capacitor. C. is always at logic 0. D. is always at logic 1.

10- Describe the logical operation of the program

11- Explain the function of the device OL

L1 2 120 VAC Pressure Temperature OL switch switch Motor starter coil Manual pushbutton