Deck 25: Programmable Logic Controllers

Question 1

Which programming language uses a BASIC style?

A) Instruction List
C) Sequential Function Chart
B) Ladder Diagram
D) Structured Text

Answer 1

D

Question 2

Which programming language is perhaps the most popular?

A) Function Block Diagram
C) Ladder Diagram
B) Instruction List
D) Structured Text

Answer 2

C

Question 3

A normally open contact acts as a switch to pass power when the status of its referenced component is off.

Answer 3

False

Question 4

PLCs are programmed by combining various instructions to form a(n) ____________________ control circuit.

Question 5

Which programming language is a structured, graphical language?

A) Instruction List
C) Sequential Function Chart
B) Ladder Diagram
D) Structured Text

Question 6

The programmable logic controller (PLC) is an assembly of ____________________ digital logic elements designed to make logical decisions and provide control.

Question 7

Which programming language offers library functions and custom functions?

A) Function Block Diagram
C) Ladder Diagram
B) Instruction List
D) Sequential Function List

Question 8

The component of a PLC that interfaces between input field devices such as pushbuttons, limit switches, selector switches, and the like and the CPU is the ____.

A) PLC rack
C) output module
B) input module
D) power supply

Question 9

What are the two basic types of time-delay functions?

Question 10

The component of a PLC that interfaces between output field devices such as relays, motor starters, annunciators, and the like and the CPU is ____.

A) PLC rack
C) output module
B) input module
D) power supply

Question 11

Which programming language is considered a low-level language suited for small programs and fast execution?

A) Function Block Diagram
C) Ladder Diagram
B) Instruction List
D) Sequential Function Chart

Question 12

PLC wiring is greatly simplified and reduced compared to point-to-point wiring.

Question 13

What precaution should be observed when wiring an emergency stop pushbutton to a PLC?

A) It should be wired normally closed and programmed normally open.
B) It should be wired normally open and programmed normally closed.
C) Emergency stop pushbuttons should be hard-wired and, therefore, should not be wired to an input module.
D) It should be wired normally closed and programmed normally closed.

Question 14

Which of the following is not an optional number of inputs for a digital input module?

A) 4
C) 16
B) 8
D) 32

Question 15

If you needed to connect a 4-20 mA pressure sensor to a PLC, you would use a(n) ____.

A) analog input module
C) digital input module
B) analog output module
D) digital output module