PLC Exam

0.0(0)
studied byStudied by 0 people
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/419

flashcard set

Earn XP

Description and Tags

Controls and Instrumentations ENGR 363

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

420 Terms

1
New cards
What are the major parts of a plc?
The CPU, I/O, power supply, and programming device
2
New cards
Architecture
Refers to PLC hardware or software
3
New cards
Open architecture
Allows the system to be connected easily to devices and programs made by other manufacturers
4
New cards
Closed architecture
A system whose design is proprietary making it difficult to connect to other systems
5
New cards
Fixed I/O
Small PLC that comes in one package with not separate removable units. The processor and I/O are packaged together
6
New cards
Modular I/O
A PLC that is divided by compartments into which separate modules can be plugged
7
New cards
Power supply
Provides DC power to all modules that plug into the rack
8
New cards
CPU or processor
A microprocessor for implementing the logic and controlling the communications among the modules
9
New cards
PLC scan cycle
Reads inputs -\> executes program -\> diagnostics & communication -\> updates outputs
10
New cards
I/O (Input/Output) system
Forms the interface by which field devices are connected to the controller.
11
New cards
I/O (Input/Output) system
Forms the interface by which field devices are connected to the controller
12
New cards
Programming device
Used to enter the desired program into the memory of the processor
13
New cards
Personal computer (PC)
The most commonly used programming device
14
New cards
Program
A series of instructions that directs the PLC to execute actions
15
New cards
Relay ladder logic
The standard programming language, is based on electromagnetic relay control
16
New cards
Address
Where an input or output device is conncected
17
New cards
PC vs PLC
PLC is designed to operate in the industrial environment with wide ranges of ambient temperature and humidity
18
New cards
Human machine interface (HMI)
Software that allows the user to monitor and control the process
19
New cards
Programmable Automation Controllers (PACs)
Combine PLC ruggedness with PC
20
New cards
functionality

21
New cards
Nano
Smallest size with less than 15 I/O
22
New cards
Micro
15-128 I/O
23
New cards
Medium
128-512 I/O
24
New cards
Large
Over 512 I/O
25
New cards
Single ended application
One PLC controlling one process
26
New cards
Multitask application
One PLC controlling several processes
27
New cards
Control management application
One PLC controlling several others
28
New cards
Memory
Part of a PLC controller that stores data, instructions, and the control program
29
New cards
Memory size
Expressed in K values
30
New cards
1K =
1024
31
New cards
Amount of memory required depends on
• Number of I/O points
32
New cards
used

33
New cards
• Size of control

34
New cards
program

35
New cards
• Data-collecting

36
New cards
requirements

37
New cards
• Supervisory functions

38
New cards
required

39
New cards
• Future expansion

40
New cards
Input interface modules
accept signals from the
41
New cards
machine or process devices and convert them into

42
New cards
signals that can be used by the controller

43
New cards
Output interface modules
convert controller signals
44
New cards
into external signals used to control the machine or

45
New cards
process

46
New cards
chassis
hardware assembly that houses I/O modules,
47
New cards
processor modules, and power supplies

48
New cards
logical rack
an addressable unit consisting of 128
49
New cards
input points and 128 output points

50
New cards
remote rack
A rack that is located away from the processor module
51
New cards
address
a label or number that indicates where
52
New cards
a certain piece of information is located in a PLC's

53
New cards
memory

54
New cards
Rack/slot-based addressing schemes
used with
55
New cards
Allen-Bradley PLC-5 and SLC 500 controllers

56
New cards
Tag-based addressing
used with Allen-Bradley
57
New cards
ControlLogix controllers

58
New cards
Combination I/O

59
New cards
modules
can
60
New cards
have both input

61
New cards
and output

62
New cards
connections in

63
New cards
the same

64
New cards
physical module

65
New cards
points
refers to the number of inputs or outputs
66
New cards
available

67
New cards
discrete I/O

68
New cards
interface module
connects
69
New cards
field input

70
New cards
devices of the

71
New cards
ON/OFF nature

72
New cards
discrete I/O module is powered by
some field supplied voltage source
73
New cards
Backplane power
Used to power the electronics that
74
New cards
reside on the I/O module circuit board

75
New cards
optical isolator
used to provide electrical isolation
76
New cards
between the power and logic circuitry

77
New cards
Interposing relay
used
78
New cards
to control a larger load

79
New cards
or motor starter

80
New cards
Output modules can be purchased with
Transistor,triac, or relay output
81
New cards
If the module is a current-sourcing module then the

82
New cards
input or output device must be a
current-sinking device
83
New cards
If the module is a current-sinking module,

84
New cards
then the input or output device must be a
current-sourcing device
85
New cards
The two basic types of analog input modules are
voltage sensing and current sensing
86
New cards
Bipolar input modules
Accept signals that swing
87
New cards
between a negative and positive value

88
New cards
Unipolar input modules
Accept an input signal
89
New cards
that varies in the positive direction only

90
New cards
Resolution refers to
the smallest change in input
91
New cards
signal value that can be sensed

92
New cards
The main element of the analog

93
New cards
output module is an
digital-to-analog (D/A) converter
94
New cards
analog output module
converts digital signal into
95
New cards
a proportional voltage or current to control an

96
New cards
analog field device

97
New cards
High-speed counter modules
used to count
98
New cards
pulses from sensors, encoders, and switches

99
New cards
that operate at very high speeds

100
New cards
TTL module
allows the