Question 1

I/O modules are designed to plug into a slot or connector.

Accepted Answer

A) True 
 B)False

Question 2

The processor may perform functions such as timing, counting, and comparing in addition to logic processing.

Accepted Answer

A) True 
 B)False

Question 3

The Allen-Bradley SLC-500 address O:3/0 refers to an

Accepted Answer

A)  input module in slot 3, terminal 0.
B)  output module in slot 3, terminal 0.
C)  input module in slot 0, terminal 3.
D)  output module in slot 0, terminal 3.E) All of the above
F) B) and C)

Question 4

Individual outputs of a typical AC output interface module usually have a maximum current rating of about

Accepted Answer

A)  1 A or 2
B)  25 A or 50
C)  50 mA or 100 mA.
D)  250 µA or 500 µA.E) A) and B)
F) A) and C)

Question 5

The current sourcing sensor shown must be matched with a _____ PLC input module.

Accepted Answer

A)  current sinking
B)  current sourcing
C)  alternating current
D)  either current sinking or current sourcingE) A) and D)
F) A) and C)

Question 6

Which of the following alarm conditions indicates that a condition is being monitored but does not have any faults present?

Accepted Answer

A)  Inactive
B)  Active
C)  OFF
D)  AcknowledgedE) B) and C)
F) All of the above

Question 7

A ______ module is used to establish connections for the exchange of data.

Accepted Answer

A)  thumbwheel
B)  communication
C)  servo
D)  PIDE) B) and C)
F) A) and D)

Question 8

The most common form of memory used to store, back up, or transfer PLC programs is

Accepted Answer

A)  RAM.
B)  Flash EEPROM.
C)  EEPROM.
D)  both Flash EEPROM and EEPROM.E) A) and B)
F) None of the above

Question 9

One function of a PLC input interface module is to

Accepted Answer

A)  accept signals from field devices and convert them into signals that can be used by the processor.
B)  convert signals from the processing unit into values that can be used to control the machine or process.
C)  input signals from the programming device and convert them into signals that can be used by the CPU.
D)  interpret and execute the user program that controls the machine or process.E) C) and D)
F) B) and D)

Question 10

Discrete means that each input or output has two states: true (on) or false (off).

Accepted Answer

A) True 
 B)False

Question 11

A modular PLC that has room for several I/O modules is capable of being customized for a particular application.

Accepted Answer

A) True 
 B)False

Question 12

Electronic components found in PLC modules

Accepted Answer

A)  are not affected by electrostatic voltages.
B)  can be damaged by electrostatic voltages.
C)  can have their performance degraded by electrostatic voltages.
D)  can be damaged by electrostatic voltages and can have their performance degraded by electrostatic voltages.E) A) and B)
F) All of the above

Question 13

Volatile memory elements can be classified as those that

Accepted Answer

A)  do not retain stored information when the power is removed.
B)  retain stored information when the power is removed.
C)  do not require a battery backup.
D)  both retain stored information when the power is removed and do not require a battery backup.E) All of the above
F) None of the above

Question 14

For the processor module shown, Block 1 represents the ___ and Block 2 the ___.

Accepted Answer

A)  input, output
B)  output, input
C)  memory, CPU
D)  CPU, memoryE) B) and C)
F) None of the above

Question 15

HMI screens are developed using a software package on a PC which is downloaded into the PLC operator interface device.

Accepted Answer

A) True 
 B)False

Question 16

Hot swappable I/O modules are designed to be changed with the power on and the PLC operating.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following specifications defines the number of field inputs or outputs that can be connected to a single module?

Accepted Answer

A)  Electrical isolation.
B)  Points per module.
C)  Threshold voltage.
D)  Current per input.E) A) and B)
F) All of the above

Question 18

For the PLC analog I/O control system shown, the fluid flow is controlled by

Accepted Answer

A)  varying the amount of the valve opening.
B)  switching the valve ON and OFF.
C)  switching the level sensor ON and OFF.
D)  varying the position of the level sensor.E) B) and C)
F) B) and D)

Question 19

I/O modules are keyed to prevent unauthorized personnel from removing them from the I/O rack.

Accepted Answer

A) True 
 B)False

Question 20

The following statement that does not apply to the optical isolator circuit used in I/O modules is that it

Accepted Answer

A)  separates high-voltage and low-voltage circuits.
B)  rectifies AC signals.
C)  prevents damage caused by line voltage transients.
D)  reduces the effect of electrical noise.E) A) and B)
F) A) and C)

Exam 2: PLC Hardware Components

A modular PLC that has room for several I/O modules is capable of being customized for a particular application.

Correct AnswerverifiedShow Answer

Electronic components found in PLC modules

Correct AnswerverifiedShow Answer

For the processor module shown, Block 1 represents the ___ and Block 2 the ___.

Correct AnswerverifiedShow Answer

The Allen-Bradley SLC-500 address O:3/0 refers to an

Correct AnswerverifiedShow Answer

The current sourcing sensor shown must be matched with a _____ PLC input module.

Correct AnswerverifiedShow Answer

Which of the following alarm conditions indicates that a condition is being monitored but does not have any faults present?

Correct AnswerverifiedShow Answer

The most common form of memory used to store, back up, or transfer PLC programs is

Correct AnswerverifiedShow Answer

I/O modules are designed to plug into a slot or connector.

Correct AnswerverifiedShow Answer

For the PLC analog I/O control system shown, the fluid flow is controlled by

Correct AnswerverifiedShow Answer

HMI screens are developed using a software package on a PC which is downloaded into the PLC operator interface device.

Correct AnswerverifiedShow Answer

Hot swappable I/O modules are designed to be changed with the power on and the PLC operating.

Correct AnswerverifiedShow Answer

Which of the following specifications defines the number of field inputs or outputs that can be connected to a single module?

Correct AnswerverifiedShow Answer

Volatile memory elements can be classified as those that

Correct AnswerverifiedShow Answer

I/O modules are keyed to prevent unauthorized personnel from removing them from the I/O rack.

Correct AnswerverifiedShow Answer

The following statement that does not apply to the optical isolator circuit used in I/O modules is that it

Correct AnswerverifiedShow Answer

Individual outputs of a typical AC output interface module usually have a maximum current rating of about

Correct AnswerverifiedShow Answer

The processor may perform functions such as timing, counting, and comparing in addition to logic processing.

Correct AnswerverifiedShow Answer

A ______ module is used to establish connections for the exchange of data.

Correct AnswerverifiedShow Answer

One function of a PLC input interface module is to

Correct AnswerverifiedShow Answer

Discrete means that each input or output has two states: true (on) or false (off).

Correct AnswerverifiedShow Answer

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For the processor module shown, Block 1 represents the _ and Block 2 the _.

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