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PLC > Review > Flashcards

Review Flashcards

1
Q

Define a programmable logic controller.

A

A solid-state control device that can be programmed to control process or machine operations. It consists of 5 basic components: the processor, memory, input/output modules, the power supply, and the programming device.

(Write out Q)

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2
Q

In the early years of their existence, PLCs were primarily used for…

A

ON/OFF control

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3
Q

The ______ and the ______ are the two basic sections of a programmable controller.

A

central processing unit; I/O interface system

Fill-in Q

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4
Q

The ladder program in a PLC is ______ inside the PLCs CPU.

A

softwired

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5
Q

True or False:

The monitoring capability of a PLC system can easily detect and correct field device failures.

A

True

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6
Q

What is the base of these number systems:

Hexadecimal
Binary
Octal
Decimal

A 
Hexadecimal = 16
Binary = 2
Octal = 8
Decimal = 10

(Matching Q)

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7
Q

Why is the binary number system used in digital devices such as programmable controllers and computers?

A

Easier to design in systems that can only distinguish between 2 states (such as ON/OFF)

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8
Q

In binary, what is one plus one?

A

One-zero (10)

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9
Q

What are the most common binary codes?

A
  • ASCII
  • BCD
  • Gray

(Multiple choice Q)

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10
Q

What format does the thumb wheel switch provide to the PLC?

A

BCD

Multiple choice Q

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11
Q

What logic type is more conventional?

A

Positive logic

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12
Q

What are the logic functions used in PLCs?

A

AND, OR, NOT

Multiple choice Q

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13
Q

What does 1 and 0 indicate?

A 
1 = ON, TRUE, or HIGH
0 = OFF, FALSE, or LOW
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14
Q

How many bits are in a 3 byte word?

A

24 bits (8 bits per byte)

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15
Q

Ladder diagrams are also called…

A

Contact symbology

Multiple choice Q

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16
Q

Each symbol in a ladder rung has a(n) ______ by which a connected device is referenced.

A

unique reference number, address, and I/O interface reference terminal connection

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17
Q

What are the three components that form the CPU?

A

The processor, the memory system, and the power supply

Multiple choice Q

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18
Q

What encompasses all the elements that form the intelligence of a PLC system?

A

The CPU

Multiple choice Q

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19
Q

Software instructions that allow the interruption of a scan to receive inputs or to update outputs are known as…

A

immediate instructions

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20
Q

Parity check is sometimes called…

A

VRC or vertical redundancy check

Fill-in Q

21
Q

True or False:

PLCs cannot use input voltages from a DC power source.

A

False

Multiple choice Q

22
Q

Name the two most common programming devices used with programmable controllers.

A

Miniprogrammers and personal computers.

Fill-in Q

23
Q

The total memory system in a PLC is composed of the ______ and the ______ memories.

A

executive; application

Fill-in Q

24
Q

______ is the most commonly used application memory.

A

RAM

Fill-in Q

25
Q

How long are words?

A

One byte or more

26
Q

The executive and scratch pad areas are part of the ______.

A

System memory

27
Q

The user program memory is reserved for storage of the ______.

A

Control logic

28
Q

How many times can an address be used in a control program?

A

Unlimited. It can be used as many times as needed.

Multiple choice Q

29
Q

A master rack refers to an enclosure that contains ______.

A

The processor

Multiple choice Q

30
Q

True or False:

The address of an I/O device, which depends on its terminal connection and interface placement in the rack, identifies the device in the control program.

A

True

Multiple choice Q

31
Q

Name the two sections of an AC/DC input module’s input circuit.

A

The power section and the logic section

32
Q

How do isolated input interfaces differ from standard AC/DC modules?

A

Isolated input interfaces have separate return, or common, lines

33
Q

Give two examples of output devices that interface with register output modules.

A
  • Seven segment display
  • BCD alphanumeric displays
  • Small DC loads

(Fill-in Q)

34
Q

True or False:

When a bypass/control station’s selector switch is in the OFF position, the PLC can control the connected field devices.

A

False

35
Q

What type of signals are analog interfaces used for?

A

For control of continuous signals

Multiple choice Q

36
Q

Analog interfaces accept either ______ or ______ types of voltages.

A

Unipolar; bipolar

37
Q

The most common formats used to represent analog values in a PLC are ______ and ______.

A

Binary; BCD

Multiple choice Q

38
Q

Analog interfaces can have either ______ or ______ input/output capabilities.

A

Single-ended (all commons tied together)

Differential (all commons separate)

39
Q

Numerical data received at the module from the processor is converted into an analog voltage or current using a(n) ______.

A

digital to analog converter (D/A converter)

Fill-in Q

40
Q

True or False:

Some PLCs use arithmetic instructions to access or send data to analog interfaces.

A

True

41
Q

True or False:

In a ladder rung, the left-most side (left power line) simulates the L1 line of a relay ladder diagram.

A

True

42
Q

True or False:

Functional blocks are part of the basic ladder language.

A

False. They’re part of the enhanced ladder language.

43
Q

The programming language that uses AND, OR, and NOT logic functions to implement the control program is called ______.

A

Boolean language

44
Q

How is a latched coil condition reset?

A

With an unlatch coil instruction

45
Q

An up counter increments it’s counted value each time it’s referenced event makes a(n) ______ transition.

A

OFF-to-ON

46
Q

What are three advantages of a PLC?

A
  • modular
  • less expensive
  • easily replaceable
  • reusable
47
Q

What forms the connection between the field device and the control?

A

The input/output system

48
Q

True or False:

In general, programmable controllers use binary numbers in one form or another to represent various codes and quantities.

A

True

49
Q

Be able to draw AND, NAND, OR, and NOR gates

P. 66 of book

A

-

PLC (1 decks)

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