Chapter 2 - Allen Bradly SLC 500

Which of the following statements is not correct?

A) Input and output instructions in ladder logic do not directly

represent the switches and actuators.

B) The PLC rung output [-( )-] is a discrete output instruction or bit

in memory.

C) Each rung of the ladder logic represents a logical statement

executed in software inputs on the right and outputs on the left.

D) PLC input instructions are logical symbols associated with voltage at the input module terminals.

C

PLCs are ________ designed for use in the control of a wide variety of manufacturing machines and systems.

special-purpose industrial computers

Which of the following statements is correct? 3) _______

A) A ladder logic program is hard to analyze because it is totally

different when compared with the equivalent relay logic solution.

B) The number of ladder logic virtual relays and input and output

instructions is limited only by memory size.

C) Ladder logic is a PLC graphical programming technique

introduced in the last 10 years.

D) The number of contacts for a mechanical relay is limited to

number of coils on the relay.

B

Which of the following statements is NOT correct? 4) _______

A) Input (-| |-) and output (- ( ) -) instruction symbols in the ladder

logic represent only data values stored in PLC memory.

B) PLCs are not as reliable as electromechanical relays in RLL.

C) The status of each input can be checked from one location and

outputs can be forced on and off.

D) All symbols in the RLL represent actual components and contacts

present in the control system.

B

Which of the following statements is NOT correct? 5) _______

A) The cost and size of PLCs have increased significantly in the last

10 years.

B) The physical wires between the input and output field devices and

the PLC input and output modules are the only signal wires

required in the PLC system.

C) If a problem in a PLC module occurs, the module can be changed

in a matter of minutes without any changes in wiring.

D) Outputs can be paralleled on the same rung.

A

When a relay is NOT energized: 6) _______

A) There is an electrical path through the NO contacts.

B) There is an electrical path through the NC contacts.

C) Neither the NO or the NC contacts have an electrical path.

D) Both the NO and the NC contacts have an electrical path.

B

On SLC 500 models the processor is placed in: 7) _______

A) The last slot.

B) Slot 0 or the middle slot if it is a 10 slot rack.

C) Next to the power supply.

D) Any slot.

C

PLC control applications could be: 8) _______

A) Controlling multiple motor starters.

B) On and off control of a pump.

C) Sorting boxes on a conveyor system by zip code.

D) All of the above.

D

field device is connected to an input module in slot 4 at terminal 9,

what is the correct SLC 500 address?

9) _______

A) I:4/9 B) I/4:9 C) I:9/4 D) I/9:4

A

An SLC 500 output address is O:2/10, what slot is the module in and

what terminal is used for the connection?

10) ______

A) Slot 10 and terminal 2

B) Slot 2 and terminal 12

C) Slot 12 and terminal 2

D) None of the above

D

The instruction with address I:1/2 represents the PLC input port ______ in the PLC module _____.

2,1

The instruction with address O:2/0 represents the PLC output port ______ in the PLC module ____ .

0,2

T/F: You can place two or more input instructions in series in a PLC ladder logic rung.

T

T/F: You can place two or more output instructions in series in a PLC ladder logic rung.

F

T/F: You can place two or more input instructions in series or parallel with each other in a PLC ladder logic rung.

T

T/F: You can place two or more output instructions in series or parallel with each other in a PLC ladder logic rung

F

T/F: In a PLC ladder logic rung, the last instruction must be an output instruction.

T

T/F: Same input address instructions may be used two or more times in a PLC ladder logic diagram.

T

T/F: Same output address instructions may be used two or more times in a PLC ladder logic diagram

F

T/F: An address number writes over the instruction description for an Input or Output instruction

F

Which of the following statements is false?

A. industrial PCs can replace PLCs.

B. Industrial PCs are more expensive than PLCs.

C. PAC controllers are better than PLC controllers.

D. None of the above.

D

A PLC programming module (PM) can be a ____.

A. desktop computer

B. hand-held programmer

C. laptop computer

D. All of the above.

D

Which of the following statements is true?

A. Data terminal equipment (DTE) initiate communication in the network.

B. Data communication equipment (DCE) initiate communication in the network.

C. In a simplex system, DCE either transmits or receives signals.

D. None of the above.

A

For small control projects in harsh environments, use the ____ industrial control system.

A. PLC

B. PAC

C. relay logic

D. None of the above.

C

When you consider purchasing a PLC or a PAC, the term “flexibility” means you can ____.

A. change the CPU

B. expand the power supply

C. change the input/output voltage level

D. add more input/output ports

C

When you consider purchasing a PLC or a PAC, the term “expandability” means you can ____.

A. upgrade the CPU

B. upgrade the current capability of the PLC power supply

C. change the input/output voltage level

D. send the PLC to the manufacturer for repair

B

For modular SLC 500 PLCs, you can ____.

A. expand the size of the rack up to 30 slots

B. expand the size of the rack up to 60 slots

C. never expand the size of the rack

D. expand the rack size as much as you want

A

All PLC and PAC power supplies must provide ____.

A. 5 volts

B. 10 volts

C. 5 and 10 volts

D. 5 and 24 volts

A

Which of the following statements is false?

A. Discrete input port can be either sourcing or sinking.

B. Discrete output port can be either sourcing or sinking.

C. ADC module converts analog signal to digital signal.

D. None of the above.

D

Which one of the following Allen-Bradley PAC controllers has a 32-bit processor?

A. Compact logix

B. Control logix

C. Soft logix

D. All of the above.

D

Which part of the PLC occupies more memory than the rest?

A. Timers and counters memory area

B. Advance functions memory area

C. User memory area

D. Input and output images memory area

C

Which checking method is used to detect data transmission error in PLC communication?

A. Parity

B. BCD

C. HEX

D. None of the above.

A

Baud rate measures ____.

A. the speed of parallel data transmission

B. microprocessor is clock speed

C. the speed of serial data transmission

D. None of the above

C

In a “framed” word, there are ____.

A. start bit and data bits

B. stop bit and data bits

C. only data bits

D. start, stop, and data bits

D

The scan cycle for a standalone PLC has ____.

A. read input devices and updates output devices

B. read input devices, executes the LLD program, and updates output devices

C. read input devices and communication channels

D. read input devices, executes the RLD, and updates output devices

B

Which of the following statements is true?

A. PLC design is similar to Personal Computer (PC) design

B. A Personal Computer (PC) can be used for process control

C. PLC is used for number-crunching in industrial control systems

D. PLC is used as an event-driven controller

D

Which of the following is important criteria when you are selecting a PLC or a PAC controller?

A. Programming software cost

B. Initial cost of the PLC or the PAC controller

C. Flexibility and expandability of the PLC or the PAC controller

D. All of the above.

D

Which of the following statements is false?

A. All PLC and PAC controllers have Timer and Counter functions.

B. All PLC and PAC controllers have Sequencer functions.

C. All PLC and PAC controllers have High Speed Counters.

D. All of the above statements are correct.

C

Which communication protocol is the fastest?

A. Full Simplex

B. Half Duplex

C. Full Duplex

D. Simplex

C

Which one of the following network system is more popular in industry?

A. DeviceNet

B. Ethernet

C. ControlNet

D. Data Highway Plus (DH+)

B

The ____ segment holds the PLC ladder logic diagram.

A. system memory

B. user memory

C. serial communication

D. simplex

B

The section of the PLC system memory that holds the status of discrete input ports is the ____ status.

A. counters’

B. input

C. timers’

D. output

B

Allen-Bradley SLC 500 PLCs have Channel ______________________________ and Channel

______________________________ that can be used for communications.

0,1

A unit for measuring the speed of serial communication transmission is the

______________________________ rate.

baud

Transmitted data that have an even number of ones uses ______________________________ parity.

even

In communication systems, DTE stands for ______________________________.

data terminal equipment

In communication systems, DCE stands for ______________________________.

data communication equipment

The ______________________________ instruction allows the system to run and allows the program to be

modified while the system is running.

remote/run program

A sinking input device must be connected to a(n) ______________________________ input module port.

sourcing

A sourcing output device must be connected to a(n) ______________________________ output module port.

sinking

The ______________________________ is a rack that serves as an electrical backplane for a PLC.

chassis

The ______________________________ Allen-Bradley SLC 500 PLCs give you the option of chassis,

power supply, processor, and I/O modules.

modular

The three different types of PLC programming modules are handheld, dedicated, and

______________________________.

computer based

Digital, or variable, output modules use ______________________________ ICs to convert digital data

supplied by the PLC processor to scalable voltage or current output.

DAC

A(n) ______________________________ check is used to find transmission errors due to lost or changed

bits.

parity