PLC CHAPTER 2 REVIEW EXAM LATEST 2026 UPDATED QUESTIONS
AND VERIFIED 100% SOLUTIONS (2026/2027) |A+ GRADED
|GUARANTEED PASS
#1 What is the function of a PLC input interface module? - Answers -To accept signals from the
machine or process devices and to convert them into signals that can be used by the controller
#2 What is the function of a PLC output interface module? - Answers -To convert controller
signals into external signals that are used to control the machine or process
#3 With reference to a PLC:
What is a remote rack?
Why are remote racks used? - Answers -a) A rack that is located away from the processor
module near the field devices
b) To minimize the amount of wiring required
#4 How does the processor identify the location of a specific input or output device? - Answers -
By its address
#5 List the three basic elements of rack/slot-based addressing. - Answers -Type refers to an
input or output
Slot refers to the physical location of the I/O module
1|Page
, Word and bit refers to the actual module terminal connection
#6 Compare bit level and word level addressing. - Answers -Bit level addressing specifies a
discrete device that is connected to a specific terminal. Word level addressing specifies an
analog device connected to a module that uses a word of information.
#7 In what way does tag-based addressing differ from rack/slot-based addressing? - Answers -In
tag-based addressing you use a tag (alphanumeric name) to address data (variables). In
rack/slot-based addressing a fixed numeric format is used to identify the address data.
#8 What do PC-based control systems use to interface with field devices? - Answers -An
input/output PC interface card
#9 What type of I/O modules have both inputs and outputs connected to them? - Answers -
Combination I/O modules
#10 In addition to field devices what other connections are made to a PLC module? - Answers -
Connections for the power supply
#11 Most PLC modules use plug-in wiring terminal strips. Why? - Answers -For ease of wiring
and replacing modules
2|Page
AND VERIFIED 100% SOLUTIONS (2026/2027) |A+ GRADED
|GUARANTEED PASS
#1 What is the function of a PLC input interface module? - Answers -To accept signals from the
machine or process devices and to convert them into signals that can be used by the controller
#2 What is the function of a PLC output interface module? - Answers -To convert controller
signals into external signals that are used to control the machine or process
#3 With reference to a PLC:
What is a remote rack?
Why are remote racks used? - Answers -a) A rack that is located away from the processor
module near the field devices
b) To minimize the amount of wiring required
#4 How does the processor identify the location of a specific input or output device? - Answers -
By its address
#5 List the three basic elements of rack/slot-based addressing. - Answers -Type refers to an
input or output
Slot refers to the physical location of the I/O module
1|Page
, Word and bit refers to the actual module terminal connection
#6 Compare bit level and word level addressing. - Answers -Bit level addressing specifies a
discrete device that is connected to a specific terminal. Word level addressing specifies an
analog device connected to a module that uses a word of information.
#7 In what way does tag-based addressing differ from rack/slot-based addressing? - Answers -In
tag-based addressing you use a tag (alphanumeric name) to address data (variables). In
rack/slot-based addressing a fixed numeric format is used to identify the address data.
#8 What do PC-based control systems use to interface with field devices? - Answers -An
input/output PC interface card
#9 What type of I/O modules have both inputs and outputs connected to them? - Answers -
Combination I/O modules
#10 In addition to field devices what other connections are made to a PLC module? - Answers -
Connections for the power supply
#11 Most PLC modules use plug-in wiring terminal strips. Why? - Answers -For ease of wiring
and replacing modules
2|Page
