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Introduction to Ladder Logic and PLC Programming

Total questions: 79

Worksheet time: 40mins

Name
Class
Date
1.

Ladder logic is a programming language that was originally an illustration of how __ were wired together.

a)

relays

b)

motors

c)

sensors

d)

valves

2.

The name "ladder logic" comes from the fact that the drawing of the control circuit resembles a __.

a)

ladder

b)

tree

c)

circle

d)

bridge

3.

In ladder logic drawings, the power rail is on the __ side.

a)

left

b)

right

c)

top

d)

bottom

4.

The neutral rail is on the __ side of the drawing.

a)

right

b)

left

c)

top

d)

bottom

5.

In the drawing conventions, the logic is always read from __ to __.

a)

left, right

b)

right, left

c)

top, bottom

d)

bottom, top

6.

Each output is placed on a separate horizontal line, which is referred to as a __.

a)

rung

b)

step

c)

bar

d)

row

7.

The lowest-level elements of ladder logic mimic __ functions.

a)

relay

b)

arithmetic

c)

timing

d)

memory

8.

A normally open contact is represented by two parallel lines with a __ between.

a)

gap

b)

dot

c)

curve

d)

arrow

9.

A normally closed contact is represented by two parallel lines with a __ line through them.

a)

diagonal

b)

vertical

c)

horizontal

d)

curved

10.

A relay __ is represented by two parentheses ( ).

a)

coil

b)

contact

c)

switch

d)

armature

11.

An AND logic function requires both inputs to be __ for the output to be activated.

a)

true

b)

false

c)

high and low

d)

off

12.

The sentence "if the machine is ready to run AND we push the Auto Start button" represents an example of __ logic.

a)

AND

b)

OR

c)

NOT

d)

XOR

13.

In ladder logic, the phrase "machine is ready to run" and "Auto Start button" are considered __.

a)

inputs

b)

outputs

c)

timers

d)

counters

14.

The logic for the "Auto Stop" button is to break the circuit, which is represented by a __ __ contact in the rung.

a)

normally closed

b)

normally open

c)

latched

d)

timed

15.

If a "latch" or "seal-in" circuit is used, a normally open contact is wired in __ with the start button.

a)

parallel

b)

series

c)

opposite

d)

reverse

16.

The "seal-in" contact is controlled by the __ of the circuit.

a)

output

b)

input

c)

resistor

d)

fuse

17.

More complex functions, such as time delays, are referred to as __ __ in modern ladder logic programming.

a)

function blocks

b)

relays

c)

timers

d)

switches

18.

The ladder logic drawing conventions are still used today, even in __ versions.

a)

digital

b)

mechanical

c)

hydraulic

d)

pneumatic

19.

An OR logic function is created by wiring two inputs in __.

a)

parallel

b)

series

c)

cascade

d)

feedback

20.

In the example provided, the machine continues to run until a normally closed contact is used to __ the circuit.

a)

break

b)

make

c)

close

d)

energize

21.

The purpose of the video is to demonstrate the use of a simulation __ to test ladder logic programs.

a)

software

b)

manual

c)

hardware

d)

circuit

22.

The video states that the concepts of ladder logic are the same for each PLC type that uses this language, even though each manufacturer uses their own specific __.

a)

syntax

b)

hardware

c)

voltage

d)

software

23.

The simulation software used in the video is called __, which mimics the Allen-Bradley Rockwell RSLogix 500 software.

a)

LogixPro

b)

SimuPLC

c)

PLC Trainer

d)

RSView

24.

All ladder logic programming in the simulation software takes place in the large __ area.

a)

ladder

b)

output

c)

input

d)

timer

25.

To add a new rung, you click on the "PLC instruction panel" and then add a new __.

a)

rung

b)

wire

c)

switch

d)

circuit

26.

A green light appears when you are able to __ a ladder logic instruction.

a)

insert

b)

delete

c)

copy

d)

rename

27.

To delete an instruction, you click on it and use the __ button on your keyboard.

a)

Delete

b)

Enter

c)

Shift

d)

Tab

28.

The video uses the __ simulator to demonstrate how the program works.

a)

LogixPro

b)

Simulink

c)

Factory I/O

d)

Automation Studio

29.

To get the address of a button or light, you simply move the __ over the device.

a)

mouse

b)

keyboard

c)

screen

d)

cable

30.

The letter 'I' in an address like I:1/0 indicates that it is an __.

a)

input

b)

output

c)

instruction

d)

indicator

31.

The letter 'O' in an address like O:2/4 indicates that it is an __.

a)

output

b)

input

c)

register

d)

timer

32.

To add a description for an instruction, you can __-click on it and select "edit symbol."

a)

right

b)

left

c)

double

d)

middle

33.

To make the program work, you must first go __ and then download the program to the PLC.

a)

online

b)

offline

c)

remote

d)

manual

34.

After downloading the program, you must set the PLC to __ mode.

a)

run

b)

stop

c)

edit

d)

test

35.

If you want to make changes to the program while online, you must first switch to __ mode.

a)

program

b)

edit

c)

view

d)

offline

36.

To change the color of a light in the simulation, you can __-click on it and select a new color.

a)

right

b)

left

c)

double

d)

middle

37.

After making any changes to the program while online, you must __ the program to the PLC again.

a)

download

b)

upload

c)

compile

d)

reset

38.

To start a new program or add more rungs, you can go to the File menu and select "New File" or click on the "rung" icon to add a new __.

a)

rung

b)

line

c)

block

d)

section

39.

Ladder logic is used to develop software for __ controllers (PLC).

a)

programmable logic

b)

personal computer

c)

process level

d)

power line

40.

PLCs are commonly used in __ control applications.

a)

industrial

b)

musical

c)

culinary

d)

artistic

41.

The name "ladder logic" comes from the fact that the program looks similar to a __.

a)

ladder

b)

tree

c)

circle

d)

bridge

42.

In ladder logic, inputs are generally written on the __ side of the program.

a)

left

b)

right

c)

top

d)

bottom

43.

Outputs are generally written on the __ side of the program.

a)

right

b)

left

c)

top

d)

bottom

44.

The left and right rails of the ladder diagram indicate the __ and the __ of the power supply.

a)

hot, neutral

b)

positive, negative

c)

live, earth

d)

phase, ground

45.

Electrical current is said to flow from __ to __ on the diagram.

a)

left, right

b)

right, left

c)

top, bottom

d)

bottom, top

46.

Each horizontal line in the ladder logic program is called a __.

a)

rung

b)

step

c)

branch

d)

node

47.

When there are multiple horizontal lines, the program is read from __ to __, and from __ to __.

a)

top, bottom, left, right

b)

left, right, top, bottom

c)

bottom, top, right, left

d)

right, left, bottom, top

48.

Each ladder logic program must end with an __ instruction.

a)

end

b)

start

c)

reset

d)

jump

49.

An end instruction is used to indicate the __ of the program.

a)

end

b)

start

c)

middle

d)

pause

50.

The placement of inputs and outputs within a rung is determined by the __ you design.

a)

logic

b)

sequence

c)

voltage

d)

timer

51.

If you want a light to turn on before a fan, you would place the logic for the light in the __ rung.

a)

first

b)

second

c)

last

d)

middle

52.

The logic for the fan would be placed in the __ rung.

a)

second

b)

first

c)

third

d)

fourth

53.

The video notes that not all inputs and outputs are necessarily connected to a __ device.

a)

physical

b)

virtual

c)

logical

d)

digital

54.

In PLC ladder logic, an input instruction is represented by __ vertical bars facing each other.

a)

two

b)

three

c)

four

d)

one

55.

The two main types of input instructions are examine if __(XIC) and examine if __(XIO).

a)

closed, open

b)

open, closed

c)

start, stop

d)

on, off

56.

The XIC instruction is sometimes called a normally __ contact.

a)

open

b)

closed

c)

shorted

d)

latched

57.

The XIO instruction is sometimes called a normally __ contact.

a)

closed

b)

open

c)

latched

d)

timed

58.

The visual difference between an XIC and an XIO instruction is that the XIO has a __ line.

a)

diagonal

b)

vertical

c)

horizontal

d)

dotted

59.

The __ of an instruction changes to indicate when its logic state is true.

a)

color

b)

size

c)

shape

d)

position

60.

The video uses a __ highlight to indicate a true logic state, similar to Allen-Bradley software.

a)

green

b)

red

c)

blue

d)

yellow

61.

The XIC and XIO instructions tell the processor to test for an __ condition.

a)

input

b)

output

c)

error

d)

reset

62.

The instructions check a specific __ location.

a)

memory

b)

register

c)

cache

d)

port

63.

A digital input device connected to a PLC provides an input signal that is stored as a __ in a memory location.

a)

bit

b)

byte

c)

word

d)

nibble

64.

A bit has a value of either __ or __.

a)

1, 0

b)

2, 3

c)

A, B

d)

True, False

65.

The XIC and XIO instructions are a __ type, which means they are either "on" or "off."

a)

discrete

b)

analog

c)

continuous

d)

variable

66.

In the case of an XIC instruction, the instruction is highlighted when the associated memory location bit is __.

a)

1

b)

0

c)

undefined

d)

reset

67.

The XIC instruction is considered false when the memory address bit is __.

a)

0

b)

1

c)

ON

d)

Set

68.

The XIO instruction acts the opposite way and is activated when the logic state is __.

a)

false

b)

true

c)

high

d)

on

69.

The XIO instruction is considered false when the logic state is __.

a)

true

b)

false

c)

high

d)

on

70.

The terms "true," "active," and "highlighted" all mean the same thing, which is an __ condition.

a)

energized

b)

neutral

c)

grounded

d)

open

71.

You should not always associate the bit value of __ as meaning "true."

a)

1

b)

0

c)

2

d)

-1

72.

XIC is true when the logic state is __.

a)

true

b)

false

c)

zero

d)

off

73.

In a ladder logic program, all inputs are written on the __ side of the rung.

a)

left

b)

right

c)

top

d)

bottom

74.

WISC Online Logic Gates Note Sheet: Which of the following best describes the AND logic gate, including its definition, truth table, illustration, Boolean equation, and application?

a)

The AND gate outputs HIGH only when all its inputs are HIGH.

b)

The AND gate outputs HIGH when any input is HIGH.

c)

The AND gate inverts the input signal.

d)

The AND gate outputs HIGH when all inputs are LOW.

75.

WISC Online Logic Gates Note Sheet: The OR logic gate outputs a high signal when at least one input is high. Which of the following is the correct Boolean equation for the OR gate?

a)

A + B

b)

A · B

c)

A ⊕ B

d)

A' + B

76.

WISC Online Logic Gates Note Sheet: Which of the following best describes the NAND logic gate, including its definition, truth table, illustration, Boolean equation, and application?

a)

A logic gate that outputs LOW only when all inputs are HIGH, with the Boolean equation Y = NOT (A AND B)

b)

A logic gate that outputs HIGH only when all inputs are HIGH, with the Boolean equation Y = A AND B

c)

A logic gate that outputs HIGH when any input is HIGH, with the Boolean equation Y = A OR B

d)

A logic gate that outputs the opposite of the input, with the Boolean equation Y = NOT A

77.

WISC Online Logic Gates Note Sheet: Which of the following best describes the NOR logic gate, including its definition, truth table, illustration, Boolean equation, and application?

a)

A logic gate that outputs true only when all inputs are false, represented by the Boolean equation (A + B)'.

b)

A logic gate that outputs true only when all inputs are true, represented by the Boolean equation AB.

c)

A logic gate that outputs true when at least one input is true, represented by the Boolean equation A + B.

d)

A logic gate that outputs true when inputs are different, represented by the Boolean equation A ⊕ B.

78.

WISC Online Logic Gates Note Sheet: Which of the following best describes the XOR logic gate, including its definition, truth table, illustration, Boolean equation, and application?

a)

The XOR gate outputs HIGH only when the inputs are different.

b)

The XOR gate outputs HIGH only when both inputs are HIGH.

c)

The XOR gate outputs LOW only when both inputs are LOW.

d)

The XOR gate outputs HIGH only when both inputs are LOW.

79.

The XNOR logic gate is defined as which of the following?

a)

A logic gate that outputs HIGH only when both inputs are the same.

b)

A logic gate that outputs HIGH only when both inputs are different.

c)

A logic gate that outputs HIGH only when both inputs are LOW.

d)

A logic gate that outputs HIGH only when both inputs are HIGH.

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