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The temporary end instruction is used when you want to change the amount of logic being scanned.

A) True
B) False

Correct Answer

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System commissioning should include checking for improper I/O addressing.

A) True
B) False

Correct Answer

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Most PLC installations require additional cooling provisions, not included in the original installation.

A) True
B) False

Correct Answer

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Which of the following would not normally be included as part of a routine preventive maintenance program?


A) Inspection of I/O field devices
B) Monitoring the program
C) Checking connections to I/O modules
D) Cleaning of the PLC enclosure

E) B) and D)
F) B) and C)

Correct Answer

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A single output device has failed while the remainder of the PLC system is functioning normally. The indicator light on the output module indicates that a signal is sent to the output point where the device is connected. You would now:


A) trace the circuit back through the logic to locate the inputs.
B) use a programming terminal to call up the rung that controls the output to see if the output coil is on.
C) check the point where the output device's field wiring is connected to the output rack.
D) check the input modules for short-circuit conditions.

E) C) and D)
F) A) and C)

Correct Answer

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A ground loop circuit can develop when each device's ground is tied to a different earth potential.

A) True
B) False

Correct Answer

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

A) True
B) False

Correct Answer

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Running signal wiring and power wiring in the same conduit helps to cut down on electrical noise.

A) True
B) False

Correct Answer

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In Allen-Bradley controllers, ____ software is required to develop and edit programs.


A) RSLinx
B) RSLogix
C) Microsoft word
D) LogixPro

E) None of the above
F) A) and D)

Correct Answer

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With reference to the input module circuit shown, a voltmeter reading of 24 VDC would indicate: With reference to the input module circuit shown, a voltmeter reading of 24 VDC would indicate: A) normal operation. B) a possible shorted PB. C) a possible fault in the field wiring. D) either a possible shorted PB or a possible fault in the field wiring.


A) normal operation.
B) a possible shorted PB.
C) a possible fault in the field wiring.
D) either a possible shorted PB or a possible fault in the field wiring.

E) A) and C)
F) A) and B)

Correct Answer

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In Allen-Bradley controllers, ____ software is required to monitor, download, and upload programs.


A) RSLinx
B) RSLogix
C) Microsoft word
D) LogixPro

E) C) and D)
F) B) and D)

Correct Answer

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Where line voltage variations to the PLC are excessive, a constant voltage transformer can be used to maintain a steady voltage.

A) True
B) False

Correct Answer

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Generally, output modules designed to drive inductive loads include suppression networks as part of the module circuit.

A) True
B) False

Correct Answer

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PLC communications protocol is a standardized method for:


A) programming PLCs.
B) connecting input devices.
C) connecting output devices.
D) transmitting data between different devices.

E) All of the above
F) B) and D)

Correct Answer

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The programming device monitor normally indicates a true instruction if the addressed input device is off and examined for an off condition.

A) True
B) False

Correct Answer

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

A) True
B) False

Correct Answer

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Under no circumstances should:


A) fiber optic and power wiring be run in the same conduit.
B) fiber optic and signal wiring be run in the same conduit.
C) signal wiring and power wiring be run in the same conduit.
D) all of these.

E) A) and B)
F) A) and C)

Correct Answer

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The processor of a PLC monitors its battery voltage level.

A) True
B) False

Correct Answer

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The diode used in the suppression circuit shown: The diode used in the suppression circuit shown: A) is connected in forward-bias to suppress DC loads. B) is connected in reverse-bias to suppress DC loads. C) is connected in forward-bias to suppress AC loads. D) is connected in reverse-bias to suppress AC loads.


A) is connected in forward-bias to suppress DC loads.
B) is connected in reverse-bias to suppress DC loads.
C) is connected in forward-bias to suppress AC loads.
D) is connected in reverse-bias to suppress AC loads.

E) C) and D)
F) All of the above

Correct Answer

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Showing 81 - 99 of 99

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