Question 1

The data monitor feature of a PLC may allow you to:

Accepted Answer

A)  change the radix or data format.
B)  store data for an instruction prior to use.
C)  view data within an instruction.
D)  all of these.E) B) and C)
F) B) and D)

Question 2

A bleeder resistor can be connected to drain off unwanted module leakage current.

Accepted Answer

A) True 
 B)False

Question 3

The offline programming mode permits the user to change the program during the machine operation.

Accepted Answer

A) True 
 B)False

Question 4

Communications protocol is a standardized method for establishing communications between different PLC devices.

Accepted Answer

A) True 
 B)False

Question 5

If the scan time is too long,a watchdog error will be declared.

Accepted Answer

A) True 
 B)False  True

Question 6

An enclosure is used to shield the controller from electrical noise and airborne contaminants.

Accepted Answer

A) True 
 B)False

Question 7

PLC malfunctions due to electrical noise usually produce temporary occurrences of operating errors.

Accepted Answer

A) True 
 B)False  True

Question 8

Electrical noise can be coupled into a PLC system:

Accepted Answer

A)  by an electrostatic field.
B)  through electromagnetic induction.
C)  by a fiber optic system.
D)  both a and b.E) A) and C)
F) B) and D)

Question 9

Certain input field devices may have a small leakage current when they are:

Accepted Answer

A)  in the on state.
B)  in the off state.
C)  examined for an on condition.
D)  examined for an off condition.E) B) and C)
F) All of the above

Question 10

The status indicator on an input module will normally be illuminated if the input device is off and examined for an off condition.

Accepted Answer

A) True 
 B)False

Question 11

The cross reference function allows you to view the transition history of a data table value.

Accepted Answer

A) True 
 B)False

Question 12

A good location for a PLC enclosure is close to:

Accepted Answer

A)  the machine or processor.
B)  large ac motors.
C)  high frequency welders.
D)  annealing furnaces.E) None of the above
F) A) and D)

Question 13

One of the diagnostic checks carried out by the processor is the proper operation of all I/O devices.

Accepted Answer

A) True 
 B)False

Question 14

Proper grounding procedures for a PLC installation specify that:

Accepted Answer

A)  all enclosures,CPU and I/O chassis,and power supplies be connected to a single low-impedance ground.
B)  paint or nonconductive materials should be scraped away to provide good ground connections.
C)  all ground connections should be made using star washers.
D)  all of these.E) B) and D)
F) A) and B)

Question 15

Typically,PLC systems installed inside an enclosure can withstand a maximum of:

Accepted Answer

A)  60 °\degree° C outside the enclosure.
B)  50 °\degree° C outside the enclosure.
C)  60 °\degree° C inside the enclosure.
D)  50 °\degree° C inside the enclosure. E) B) and C)
F) All of the above

Question 16

The I/O module input and output status lights:

Accepted Answer

A)  are found only on analog modules.
B)  indicate the status of the inputs and outputs.
C)  indicate whether the process field devices are faulty.
D)  are not used in the troubleshooting process.E) A) and B)
F) A) and C)

Question 17

The input wiring or device is suspected as being the source of a PLC problem.If this circuit is not at fault,then the status indicator on the input module should be illuminated when the input device is:

Accepted Answer

A)  closed and programmed for an XIC condition.
B)  open and programmed for an XIO condition.
C)  closed,regardless of how it is programmed.
D)  open,regardless of how it is programmed.E) B) and C)
F) A) and D)

Question 18

Which of the following would not normally be located within the PLC enclosure?

Accepted Answer

A)  I/O modules
B)  Limit switch
C)  Master control relay
D)  Isolation transformerE) A) and C)
F) A) and B)

Question 19

Which of the choices of the troubleshooting guide shown indicates a problem with the wiring to the output device or the output device itself?

Accepted Answer

A)  Condition (a) 
B)  Condition (b) 
C)  Condition (c) 
D)  Condition (d) E) A) and B)
F) B) and D)

Question 20

Assume an open in the field wiring is suspected between the output module and output load device.This condition would be confirmed if:

Accepted Answer

A)  full output voltage was measured at the module and 0 voltage at the load.
B)  full output voltage was measured at the load and 0 voltage at the module.
C)  the output status indicator on the module is on and the load is not operating.
D)  the output status indicator on the module is off and the load is not operating.E) A) and B)
F) A) and C) A

Exam 13: Plc Installation Practices,editing,and Troubleshooting

The data monitor feature of a PLC may allow you to:

Correct AnswerverifiedShow Answer

A bleeder resistor can be connected to drain off unwanted module leakage current.

Correct AnswerverifiedShow Answer

The offline programming mode permits the user to change the program during the machine operation.

Correct AnswerverifiedShow Answer

Communications protocol is a standardized method for establishing communications between different PLC devices.

Correct AnswerverifiedShow Answer

If the scan time is too long,a watchdog error will be declared.

Correct AnswerverifiedTrue

An enclosure is used to shield the controller from electrical noise and airborne contaminants.

Correct AnswerverifiedShow Answer

PLC malfunctions due to electrical noise usually produce temporary occurrences of operating errors.

Correct AnswerverifiedTrue

Electrical noise can be coupled into a PLC system:

Correct AnswerverifiedShow Answer

Certain input field devices may have a small leakage current when they are:

Correct AnswerverifiedShow Answer

The status indicator on an input module will normally be illuminated if the input device is off and examined for an off condition.

Correct AnswerverifiedShow Answer

The cross reference function allows you to view the transition history of a data table value.

Correct AnswerverifiedShow Answer

A good location for a PLC enclosure is close to:

Correct AnswerverifiedShow Answer

One of the diagnostic checks carried out by the processor is the proper operation of all I/O devices.

Correct AnswerverifiedShow Answer

Proper grounding procedures for a PLC installation specify that:

Correct AnswerverifiedShow Answer

Typically,PLC systems installed inside an enclosure can withstand a maximum of:

Correct AnswerverifiedShow Answer

The I/O module input and output status lights:

Correct AnswerverifiedShow Answer

The input wiring or device is suspected as being the source of a PLC problem.If this circuit is not at fault,then the status indicator on the input module should be illuminated when the input device is:

Correct AnswerverifiedShow Answer

Which of the following would not normally be located within the PLC enclosure?

Correct AnswerverifiedShow Answer

Which of the choices of the troubleshooting guide shown indicates a problem with the wiring to the output device or the output device itself?

Correct AnswerverifiedShow Answer

Assume an open in the field wiring is suspected between the output module and output load device.This condition would be confirmed if:

Correct AnswerverifiedA

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A