PLC Final Review

What is the job of the CPU?

• Forms the interface between input field devices to the controller.

• To provide DC power to the PLC.

• Store and run the PLC software program.

• Forms the interface between output field devices to the controller.

What is the address in the PLC program for a push-button that is landed on terminal 4 in the 3rd slot of the chassis?

• I: 3/4

• I: 4/3

• O: 3/4

• O: 4/3

Which type of signal is either ON or OFF?

• MMMQ

• Data

• Analog

• Discrete

Which of the following is an input field device?

• indicator light

• small motor

• selector switch

• motor starter coil

Which type of memory stores the PLC operating system?

• RAM

• ROM

• GOAT

• USB

DC analog output modules use a(n) _____ to convert the signal from the CPU to a signal the field device can use.

• analog-to-digital converter (A/D)

• discrete converter

• conventional converter

• digital-to-analog converter (D/A)

What does an optical isolator do?

• Electrically isolates the internal components from the I/O terminals.

• Uses the data tables to make logical decisions.

• Takes a current signal and turns it into a pressure.

• Powers up each individual card and it doubles as a communication bus.

How many binary bits are in a byte?

• 1

• 2

• 8

• 16

What is this symbol?

• AND

• OR

• NOT

• NEVER

What is this symbol?

• AND

• OR

• NOT

• NEVER