Question 1

The suspend instruction is used to trap and identify specific conditions.

Accepted Answer

A) True 
 B)False

Question 2

Most solid-state switches will conduct a small amount of leakage current in the off state.

Accepted Answer

A) True 
 B)False

Question 3

When a grounding connection must be made to the metal enclosure of a PLC system,any paint coating must be removed.

Accepted Answer

A) True 
 B)False

Question 4

In addition to being an important safety measure,proper grounding of a PLC system can:

Accepted Answer

A) lower installation costs. 
B) increase the power efficiency of the system. 
C) limit the effects of EMI. 
D) assist in the operation of the MCR.

Question 5

A fiber optic wired control system is most susceptible electrical noise.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

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

Question 7

I/O leakage problems usually occur with devices that use:

Accepted Answer

A) solid-state switching circuits. 
B) hard contacts. 
C) noise-suppression circuits. 
D) voltage-suppression circuits.

Question 8

Leakage current can falsely activate a PLC input.

Accepted Answer

A) True 
 B)False

Question 9

PLC communications protocol is a standardized method for:

Accepted Answer

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

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

For most PLC installations,a NEMA ____enclosure is recommended.

Accepted Answer

A) 2 
B) 4 
C) 8 
D) 12

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

Common potential noise generating devices include noninductive resistive loads.

Accepted Answer

A) True 
 B)False

Question 14

Ground loop circuits cause problems by adding or subtracting current or voltage from input signal sources.

Accepted Answer

A) True 
 B)False

Question 15

Which function of a PLC would be used to view the transition history (on or off states)of a bit(s)?

Accepted Answer

A) Change radix. 
B) Forcing. 
C) Cross reference. 
D) Contact histogram.

Question 16

The processor of a PLC monitors its battery voltage level.

Accepted Answer

A) True 
 B)False

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

Which instruction is use to change the amount of logic scanned to progressively debug a program?

Accepted Answer

A) Suspend 
B) Temporary end 
C) Force 
D) Timed interrupt

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

With reference to the input module circuit shown,a voltmeter reading of 24 VDC would indicate:

Accepted Answer

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

Exam 13: Plc Installation Practices,editing,and Troubleshooting

The suspend instruction is used to trap and identify specific conditions.

Most solid-state switches will conduct a small amount of leakage current in the off state.

When a grounding connection must be made to the metal enclosure of a PLC system,any paint coating must be removed.

In addition to being an important safety measure,proper grounding of a PLC system can:

A fiber optic wired control system is most susceptible electrical noise.

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

I/O leakage problems usually occur with devices that use:

Leakage current can falsely activate a PLC input.

PLC communications protocol is a standardized method for:

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

For most PLC installations,a NEMA ____enclosure is recommended.

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

Common potential noise generating devices include noninductive resistive loads.

Ground loop circuits cause problems by adding or subtracting current or voltage from input signal sources.

Which function of a PLC would be used to view the transition history (on or off states) of a bit(s) ?

The processor of a PLC monitors its battery voltage level.

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

Which instruction is use to change the amount of logic scanned to progressively debug a program?

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

With reference to the input module circuit shown,a voltmeter reading of 24 VDC would indicate: