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DCS last sem > Midterm > Flashcards

Midterm Flashcards

1
Q

OSI Physical Layer

A

Layer 1. Electrical and mechanical definition of the physical system (cabling & connection)

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2
Q

OSI Data-Link Layer

A

Layer 2. Framing & error correction format of data

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3
Q

OSI Network Layer

A

Layer 3. Optimum routing of messages from on network to another

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4
Q

OSI Transport Layer

A

Layer 4. Channel for transfer of messages from one application process to another

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5
Q

OSI Session Layer

A

Layer 5. Organization and synchronization of the data exchange

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6
Q

OSI Presentation Layer

A

Layer 6. Data format encryption or representation

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7
Q

OSI Application Layer

A

Layer 7. file transfer/message exchange

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8
Q

TCP/IP Application Layer

A

Layer 4. Contains application, presentation & session layer of OSI

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9
Q

TCP/IP Transport Layer

A

Layer 3. Same as OSI

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10
Q

TCP/IP Network (Internet) Layer

A

Layer 2. Same as OSI

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11
Q

TCP/IP Subnetwork Layer

A

Layer 1. Contains data-link and physical layer of OSI

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12
Q

LAN Components Respective Layers - Hubs, repeaters, transceivers

A

OSI Layer 1 (Physical) - TCP/IP Layer 1 (Subnetwork)

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13
Q

LAN Components Respective Layers - Switches and bridges

A

OSI Layer 2 (Datalink) - TCP/IP Layer 1 (Subnetwork)

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14
Q

Lan Components Respective Layers - Router

A

OSI Layer 3 (Network) - TCP/IP Layer 2 (Internet/Network)

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15
Q

Lan Components Respective Layers - Gateway

A

OSI Layer 7 (Application) - TCP/IP Layer 4 (Application)

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16
Q

Lan Components Definitions/Uses - Repeater

A

Increase length and number of new devices that can be connected. “Signal Amplifier”

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17
Q

Lan Components Definitions/Uses - Hub

A

Increase length and number of devices by adding several segments. 1 device per segment. “Star Topology”

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18
Q

Lan Components Definitions/Uses - Transciever

A

Adapt different types of physical media. “Signal Converter”

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19
Q

Lan Components Definitions/Uses - Switch

A

Increased length and number of devices by adding several segments. When message is received, receiver address is analyzed and send “Star topology”. Switches also separate collision domains and optimize network communications as a results

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20
Q

Lan Components Definitions/Uses - Bridge

A

Connects two networks using same application layer but different lower layers.

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21
Q

Lan Components Definitions/Uses - Router

A

Routes info between networks using the same application layer.

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22
Q

Lan Components Definitions/Uses - Gateway

A

Connect two different networks of completely different types.

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23
Q

First Octet - Class A

A

0-126

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24
Q

First Octet - Class B

A

128-191

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25
Q

First Octet - Class C

A

192-223

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26
Q

Default IPV4 subnet - Class A

A

255.0.0.0

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27
Q

Default IPV4 subnet - Class B

A

255.255.0.0

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28
Q

Default IPV4 subnet - Class C

A

255.255.255.0

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29
Q

Domain

A

Greater than 10 computer on a network: DNS Authentication server allows for one entry to get to all computers

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30
Q

Work Group

A

Less than 10 computers on a network: all 9 computers must be accessed one by one for an entry

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31
Q

Straight Through RJ45

A

(10BaseT) DTE to DCE - EIA/TIA 568A to EIA/TIA 568A or EIA/TIA 568B to EIA/TIA 568B

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32
Q

Cross Over RJ45

A

(10BaseT) DTE to DTE - EIA/TIA 568A to EIA/TIA 568B

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33
Q

568A Important Numberings and Colors

A

1,2,3,6 - white/green, green, white/orange, orange (both oranges and greens switch for B)

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34
Q

568B Important numberings and Colors

A

1,2,3,6 - white/orange, orange, white/green, green (both oranges and greens switch for A)

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35
Q

Network Topologies - TREE

A

Used by domains

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36
Q

Network Topologies - GRID

A

Used by interweb

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37
Q

Network Topologies - MESH

A

Used by Wireless HART

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38
Q

Network Topologies - Point to Point

A

Used by RS-232

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39
Q

Network Topologies - BUS

A

Used by RS-485

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40
Q

Network Topologies - Token Ring

A

Used by SCADA

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41
Q

Network Arbitration Methods - CSMA/CD

A

(ASYNCHRONUS) If 2 transmissions occur at the same time, collision is detected, transmissions stop. After random time, transmission is once again attempted.

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42
Q

Network Arbitration Methods - CSMA/CA

A

(ASYNCHRONUS) Listen before transmission. Wait for clear channel. Uses random backoff times.

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43
Q

Network Arbitration Methods - Master/Slave

A

(ASYNCHRONUS) Central master controls communication, grants permission for slaves to transmit.

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44
Q

Network Arbitration Methods - Token Passing

A

(DETERMINISTIC) Device can only transmit when it has the token

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45
Q

Network Arbitration Methods - Time Division Multiplexing

A

(DETERMINISTIC/SYNCHRONUS) Each device transmits in turn based off of time

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46
Q

TCP/IP DOS Utilities - PING

A

Establishes whether a known computer is powered on and communicating on a network

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47
Q

TCP/IP DOS Utilities - IPCONFIG

A

Response is own computers IP addresses of all NIC cards/adapters

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48
Q

TCP/IP DOS Utilities - IPCONFIG /ALL

A

Response is own computers IP address and MAC addresses of all NIC cards/adapters and DNS server IP address and subnet mask settings

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49
Q

TCP/IP DOS Utilities - ARP -A

A

Queries all connected switches, requesting their respective IP to MAC address tables of all connected switches

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50
Q

IntERnet

A

A worldwide system of linked networks

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51
Q

IntRAnet

A

Private networking using internet type tools

52
Q

LAN

A

Local Area Network

53
Q

WAN

A

Wide Area Network - combines multiple LANs that are geographically separate - Internet

54
Q

MAN

A

Metropolitan Area Network - Large than LAN smaller than WAN

55
Q

Doman Name Service

A

‘Phonebook’ of the internet - Translates URLs into IPs - example ‘GoDaddy’

56
Q

Dynamic Host Configuration Protocol (DHCP)

A

Dynamic Host Configuration Protocol (DHCP)
‘Lease’ or assigns IP address to your computer (NIC). from your internet service provider. As opposed to industrial control system which typically use static IP addresses

57
Q

Physical Layer - 10Base2
?Impedance
?AKA
?Segment Max
?Cable type

A

50 ohm impedance
Thin net
185m segment max
Coaxial Cable

58
Q

Physical Layer - 10Base5
?Impedance
?AKA
?Segment Max
?Cable type

A

50 ohm impedance
Thick net
500m segment max
Coaxial cable

59
Q

Physical Layer - 10BaseFL
?mode
?Segment Max
?direction
?bandwidth
?diameter

A

Single Mode Fiber Optic
10,000m segment max
unidirectional
fastest bandwidth
10 micro diameter
Uses, ST, SC, LC fiber connectors

60
Q

Physical Layer - 10BaseF
?mode
?Segment Max
?direction
?diameter

A

Multi Mode Fiber Optic
2,000m segment max
Bidirectional
62.5 micro diameter legacy and 50 micro diameter contemporary
Uses, ST, SC, LC fiber connectors

61
Q

Physical Layer - 10BaseT
?Duplex
?Type
1. cables and connectors
2. cable varieties
3. Max Segment

A

Twisted pair, full duplex
1. RJ45 568A and 568B
2. CAT 5, 5E, 6, 6A
3. 100m max segment

62
Q

Computer Ports - What are they?

A

Logical entrances and exits of your computer
Specific and registered to protocol types
Maintained by Internet Assigned Numbers Authority (IANA)

63
Q

Computer Ports - File Transfer Protocol (FTP) Hint: 2

A

Port 20 (Data)
Port 21 (Command)

64
Q

Computer Ports - Simple Mail Transfer Protocol (SMTP)

A

Port 25 (Outgoing Mail)

65
Q

Computer Ports - Protocol Version 3 (POP3)

A

Port 110 (Incoming Mail)

66
Q

Computer Ports - Transfer Protocol (HTTP)

A

Port 80 (WWW Browser) (Porn)

67
Q

Computer Ports - Network Time Protocol (NTP)

A

Port 123 (Synchronizes all nodes participating on a network)

68
Q

Computer Ports - Simple Network Management Protocol (SNMP)

A

Port 161 (Used by IT to system patch or other maitenance)

69
Q

Computer Ports - Modbus TCP

A

Port 502 (Ethernet variation of Modbus RTU)

70
Q

Computer Ports - Ethernet IP

A

Port 44818 (Ethernet variation of DeviceNet)

71
Q

What is a computer socket?

A

Combination of IP address and Port
Example: 192.44.221.123:502

72
Q

Asynchronous Arbitration

A

Random and/or event driven. Synchronous would be deterministic.

73
Q

OSI STACK LAYERS ORDER ACROYNYM

A

A P S T N D P

74
Q

When was Profibus developed?

A

Profibus is the result of a joint project started in 1980’s by Bosch, Klöckner-Möller and Siemens. This joint project subsequently involved a total of 13 companies and 5 universities.

75
Q

(Profibus) What is Profibus?

A

Profibus is a field bus standard that contains a set of protocols (located in three levels of the OSI model) that make possible communication between PLCs and distributed I/O modules, HMIs, drives, etc.

76
Q

(Profibus) What does Profibus DP/PA stand for

A

PROFIBUS-DP for Decentral Periphery, and PROFIBUS-PA for Process Automation

77
Q

(Profibus) What is Profibus used for?

A

PROFIBUS DP is the profile for discrete (or factory) automation. An identical protocol, profiled as PROFIBUS PA, is used for process automation.

78
Q

(Profibus) Is Profibus an open source or proprietary protocol?

A

Profibus is open source!!

79
Q

(MODBUS) Name two MODBUS serial transmission modes.

A

ASCII Mode and RTU Mode

80
Q

(MODBUS) Which OSI model layers are omitted when using EIA/TIA-232 or EIA/TIA-485 with MODBUS?

A

Layers 6 down to 3.

81
Q

(MODBUS) Why is there no source address in a MODBUS message frame?

A

the source of a message is always the master.

82
Q

(MODBUS) When are terminating resistors required on a MODBUS chain and what should the value of this resistor be?

A

Terminating resistors of 120Ω are required at both ends of a EIA/TIA-485 chain

83
Q

(MODBUS) True of false: A hub extends the length of a EIA/TIA-232 chain.

84
Q

(HART) What is the purpose of the preamble portion of the HART telegram structure?

A

To wake the devices up, or prepare them for an upcoming master’s communication

85
Q

(HART) What are the frequencies assigned to the binary values 1 and 0 according to HART protocol?

A

1200Hz and 2200Hz respectively

86
Q

(HART) Does HART use a parity bit, why or why not?

A

Yes, for transmission error checking, to check the validity of the message sent to either master or slave.

87
Q

(HART) What communication speed, Baud rate, does HART utilize?

88
Q

(HART) How many masters can appear on a HART loop, and why?

A

2 masters are allowed on a HART loop, one for the DCS system(primary), and a HART handheld communicator(secondary), used by a device technician.

89
Q

(FIELDBUS) What is the purpose of the Power conditioner versus the Power supply?

A

The purpose of the Power conditioner, is to allow the AC frequency modulated, mancester encoding data bits to appear on the DC powered network. A normal power supply, would defeat any AC frequency.

90
Q

(FIELDBUS) How many nodes can be connected on each populated segment of an FF H1 network?

A

32 self powered nodes on a populated section.

91
Q

(FIELDBUS) What is the maximum data rate in order to ensure intrinsic safety?

A

31.25 kbytes

92
Q

(FIELDBUS) What layer is defined specifically for the Foundation Fieldbus model and not the OSI model?

A

User application layer which contains different device descriptions and therefore function blocks. This provides guidelines for how the fieldbus device applications shall be designed and implemented to ensure interoperability.

93
Q

(FIELDBUS) Why are the intermediate layers (layers 3-6) not needed when using FF?

A

The intermediate layers are usually associated with non-time critical and general purpose applications (such as routing and forwarding), which are not needed in LAN (such as Foundation Fieldbus) and have therefore been removed from the FF architecture.

94
Q

(DeviceNet) An Advantage of DeviceNet would be to lower installation costs by lowering the amount of wiring needed for the network …True or False?

95
Q

(DeviceNet) DeviceNet networks allow a plug and play type of system which is just like interchangeability amount devices. True or False

96
Q

(DeviceNet) Devicenet cannot exceed how many devices on one network
34
32
64
48

97
Q

(DeviceNet) The use of plug and play connections will help against.

A

Short circuits and inversion of connections

98
Q

(DeviceNet) What are the 3 serial communication speeds to DeviceNet?

A

125 Kbps, 250 Kbps, 500 Kbps
the distances: 500m,250m,and125m

99
Q

ISA

A

International Society of Automation

100
Q

IEC

A

International Electrotechnical Commission

101
Q

OPC

A

OLE for Process Control

102
Q

OLE

A

Object Linking and Embedding

103
Q

EAM

A

Enterprise Asset Management

104
Q

HTML

A

Hypertext Markup Language

105
Q

XML

A

Extensible Markup Language

106
Q

HMI

A

Human Machine Interface

107
Q

Technical Office Protocol
Choose matching term
1 MIDDLE
2 BOTTOM
3 BACK
4 TOP

108
Q

CSMA/CD

A

Carrier Sense Multiple Access with Detection

109
Q

CSMA/CA

A

Carrier Sense Multiple Access with Collision Avoidance

110
Q

GSM

A

Global System for Mobile Communication

111
Q

ERP

A

Enterprise Resourcing Planning

112
Q

CIP

A

Common Industrial Protocol

113
Q

MAP

A

Manufacturing Automation Protocol

114
Q

TCP/IP

A

Transmission Control Protocol/Internet Protocol

115
Q

MAC

A

Media Access Control

116
Q

LLC

A

Logical Link Control

117
Q

PCS

A

Process Control System

118
Q

TSMP

A

Time Synchronized Mesh Protocol

119
Q

ACK

A

Acknowledged

120
Q

NACK

A

Not Acknowledged

121
Q

UTP

A

Unshielded Twisted Pair

122
Q

STP

A

Shielded Twisted Pair

123
Q

TDMA

A

Time Division Multiple Access

124
Q

TSMP

A

Time-Synchronized Mesh Protocol

125
Q

PA

A

Process Automation

126
Q

SIS

A

Safety Instrument System

127
Q

DHCP

A

Dynamic Host Configuration Protocol

DCS last sem (3 decks)

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