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Industrial Electronics > PLC 1 > Flashcards

PLC 1 Flashcards

1
Q

also referred to as
programmable controllers, are in the computer family.

A

Programmable Logic Controllers(PLCs)

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2
Q

monitors
inputs, makes decisions based on its program, and controls
outputs to automate a process or machine.

A

Programmable Logic Controllers(PLCs)

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3
Q

Parts of PLC

A

input modules or points, a Central Processing
Unit (CPU), and output modules or points.

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4
Q

input modules or points, a Central Processing
Unit (CPU), and output modules or points.

A

PLC parts

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5
Q

accepts a
variety of digital or analog signals from various field devices
(sensors) and converts them into a logic signal that can be used
by the CPU.

A

INPUT or INPUT modules or points

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6
Q

CPU

A

makes decisions and executes control
instructions based on program instructions in memory.

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6
Q

makes decisions and executes control
instructions based on program instructions in memory.

A

CPU

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7
Q

NPUT or INPUT modules or points

A

accepts a
variety of digital or analog signals from various field devices
(sensors) and converts them into a logic signal that can be used
by the CPU.

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8
Q

convert control instructions from the CPU into a digital
or analog signal that can be used to control various field devices
(actuators).

A

Output
modules

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9
Q

Output
modules

A

convert control instructions from the CPU into a digital
or analog signal that can be used to control various field devices
(actuators).

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10
Q

is used to input the desired
instructions. These instructions determine what the PLC will do
for a specific input.

A

Programming Device

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11
Q

Programming Device

A

is used to input the desired
instructions. These instructions determine what the PLC will do
for a specific input.

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12
Q

allows process
information to be displayed and new control parameters to be
entered.

A

An operator interface device

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13
Q

An operator interface device

A

allows process
information to be displayed and new control parameters to be
entered.

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14
Q

Prior to PLCs, what are the devices used to control the task done by PLC

A

RELAY controls or Contactor

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15
Q

RELAY controls or Contactor

A

devices used to control the task prior to PLCs

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16
Q

Hard-wiring

A

Method used for automating Inputs and outputs of a system through relay or contactor.Circuit diagrams had to be designed, electrical

components specified and installed, and wiring lists created.
Electricians would then wire the components necessary to
perform a specific task. If an error was made the wires had
to be reconnected correctly. A change in function or system
expansion required extensive component changes and rewiring.

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17
Q

Method used for automating Inputs and outputs of a system through relay or contactor.Circuit diagrams had to be designed, electrical

components specified and installed, and wiring lists created.
Electricians would then wire the components necessary to
perform a specific task. If an error was made the wires had
to be reconnected correctly. A change in function or system
expansion required extensive component changes and rewiring.

A

Hard Wiring

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18
Q

advantages of PLCs

A

Smaller physical size than hard-wire solutions.
* Easier and faster to make changes.
* PLCs have integrated diagnostics and override functions.
* Diagnostics are centrally available.
* Applications can be immediately documented.
* Applications can be duplicated faster and less expensively.

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19
Q

Samples of application of PLCs

A

smaller, stand-alone applications such as elevators, car washes,
or mixing machines. It can also be used on more complex
industrial applications such as bottling and packaging machines.

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20
Q

Characteristics of number systems

A

digits, base, weight.

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21
Q

information in the form of
On or Off conditions (1 or 0),

A

Binary digits

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22
Q

digits in terms of Decimal

A

0,1,2,3,4,5,6,7,8,9

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23
Q

Base or Radix in terms of Decimal

A

10

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24
Q

Weights in decimal

A

1, 10, 100, 1000 etc. (power of 10s)

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25
Q

Weights in decimal

A

Powers of base 2(1, 2, 4, 8, 16,…)

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26
Q

sensor

A

is a device that converts a physical condition into an
electrical signal for use by the PLC.

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27
Q

is a device that converts a physical condition into an
electrical signal for use by the PLC.

A

Sensor

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28
Q

Sensors are connected to

A

Input of PLC

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29
Q

convert an electrical signal from the PLC into a
physical condition. connected to the PLC output.

A

Actuator

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30
Q

Actuator

A

convert an electrical signal from the PLC into a
physical condition. connected to the PLC output.

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31
Q

Voltage input of PLC

A

24 VDC

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32
Q

analog input

A

is an input signal that has a continuous signal.

33
Q

what inputs are those that may vary from 0 to 20 milliamps, 4 to 20
milliamps, or 0 to 10 volts.

A

analog input since they can vary

34
Q

discrete output

A

an output that is either in an ON or OFF
condition.

35
Q

Solenoids, contactor coils, and lamps are examples
of actuator devices connected to

A

discrete outputs.

36
Q

Discrete
outputs may also be referred to as

A

Digital outputs

37
Q

Examples of analog meter

A

speed, weight, and temperature.

38
Q

speed, weight, and temperature.

A

Examples of analog meter

39
Q

is a microprocessor system
that contains the system memory and is the PLC decision-
making unit.

A

The central processor unit

40
Q

monitors the inputs and makes decisions
based on instructions held in the program memory.

A

CPU

41
Q

performs relay, counting, timing, data comparison, and
sequential operations.

A

CPU

42
Q

consists of one or more instructions that accomplish
a task.

A

Program

43
Q

simply constructing a set of
instructions.

A

Programming a PLC

44
Q

ladder logic, statement lists, or function block diagrams.

A

Different PLC programming methods

45
Q

Different PLC programming methods

A

ladder logic, statement lists, or function block diagrams.

46
Q

one programming language used
with PLCs.

A

Ladder logic (LAD)

47
Q

uses components that resemble
elements used in a line diagram format to describe hard-wired
control.

A

Ladder Logic

48
Q

represents the
power or energized conductor.

A

Left Vertical line

49
Q

represents the neutral or return path of the circuit.

A

output element or instruction

50
Q

represents the return path on a hard-wired
control line diagram, is omitted.

A

Right Vertical line

51
Q

Ladder logic diagrams are read from

A

left-to-right, top-to-bottom.

52
Q

are sometimes referred
to as networks.

A

Rungs

53
Q

may have several control elements,
but only one output coil.

A

Network

54
Q

provides another view of a set of instructions.

A

statement list (STL)

55
Q

in STL he operation, what is to be done, is shown on

A

left

56
Q

in STL The operand, the item to be operated on by the operation,
is shown on the

A

RIGHT

57
Q

in STL A comparison between the statement
list shown

A

below

58
Q

provide another view of a set of
instructions.

A

Function Block Diagrams (FBD)

59
Q

in FBD, Functions are indicated by a

A

Rectangle

60
Q

are shown
on the left-hand side of the rectangle

A

Inputs

61
Q

are shown on
the right-hand side.

A

OUTPUTS

62
Q

The PLC program is executed as part of a repetitive process
referred to as a

A

scan

63
Q

A PLC scan starts with

A

CPU reading
the status of inputs.

64
Q

The application program is executed using

A

the status of inputs.

65
Q

Once the program is completed,

A

the
CPU performs internal diagnostics and communication tasks.

66
Q

The scan cycle ends by

A

updating the outputs, then starts over.

67
Q

any information in a form that a computer or PLC
can use.

A

Software

68
Q

is the actual equipment. The PLC, the programming
device, and the connecting cable are examples of

A

Hardware

69
Q

is memory where data can be
directly accessed at any address.

A

RAM (Random Access Memory)

70
Q

Data can be written to and
read from

A

RAM (Random Access Memory)

71
Q

is used as a temporary storage area and is volatile.

A

RAM (Random Access Memory)

72
Q

the data stored in RAM will be
(____) if power is lost.

A

lost

73
Q

is a type of memory that data can
be read from but not written to and This type of memory is used
to protect data or programs from accidental erasure.

A

Read Only Memory (ROM)

74
Q

this memory type is nonvolatile. This means a user program will not lose
data during a loss of electrical power.

A

Read Only Memory (ROM)

75
Q

(EPROM)

A

Erasable Programmable Read Only Memory

76
Q

provides
some level of security against unauthorized or unwanted
changes in a program.

A

Erasable Programmable Read Only Memory

77
Q

EPROMs are designed so that data
stored in them can be read, but not easily altered.

A

EPROM

78
Q

can only be erased
with an ultraviolet light.

A

UVEPROMs (ultraviolet
erasable programmable read only memory)

79
Q

memory), can only be erased
electronically.

A

EEPROM (electronically erasable
programmable read only memory),

80
Q

user or application specific software burned into
EPROM and delivered as part of the hardware.gives
the PLC its basic functionality.

A

Firmware

Industrial Electronics (3 decks)

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