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DCS last sem > Quiz 3 - Theory > Flashcards

Quiz 3 - Theory Flashcards

(85 cards)

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1
Q

What is the primary goal of the Fieldbus Foundation?

A

To increase industry acceptance of FOUNDATION Fieldbus technology and support its standards development.

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2
Q

What are the two types of fieldbus mentioned?

A

Fieldbus (capitalized, by Fieldbus Foundation) and fieldbus (generic term for other protocols like Profibus PA).

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3
Q

What is the data rate of Foundation Fieldbus H1?

A

31.25 kbps.

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4
Q

How many devices can be on a single FF H1 network?

A

32 (including the master).

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5
Q

What is the role of the Link Active Scheduler (LAS) in FF?

A

Controls communication timing, schedules traffic, and maintains the “Live List” of devices.

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6
Q

What are the three communication models in FF?

A

Client/Server, Report Distribution, and Publisher/Subscriber.

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7
Q

What is the purpose of terminators in FF networks?

A

To prevent signal reflections by matching line impedance (100Ω + 1µF).

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8
Q

What are the four types of FF cables and their max lengths?

A

Type A: 1900m

Type B: 1200m

Type C: 400m

Type D: 200m
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9
Q

What is the maximum segment distance for FF H1 with Type A cable?

A

1900 meters.

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10
Q

What is the arbitration method for DeviceNet?

A

CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance).

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11
Q

What protocol does DeviceNet use for OSI layers 5-7?

A

Common Industrial Protocol (CIP).

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12
Q

What is the max data rate of DeviceNet?

A

500 kbps.

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13
Q

What does PROFIBUS stand for?

A

Process Field Bus.

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14
Q

Which OSI layers does PROFIBUS implement?

A

Physical (1), Data Link (2), and Application (7).

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15
Q

What is the physical layer for PROFIBUS DP?

A

RS-485.

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16
Q

What is the physical layer for PROFIBUS PA?

A

IEC 61158-2.

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17
Q

Why is clocking important in NRZ encoding?

A

Ensures synchronization between transmitter and receiver.

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18
Q

What is the first address for a PROFIBUS master station?

A

1

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19
Q

What is the function of start/end delimiters in PROFIBUS frames?

A

Denotes the start and end of the message.

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20
Q

Why does PROFIBUS PA need power conditioning?

A

To retain the transmission signal through the segment.

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21
Q

In Modbus RTU, which baud rate is faster: 19200 or 115200?

A

115200 bps

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22
Q

What is the advantage of Modbus ASCII over RTU?

A

Human-readable text for easier debugging.

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23
Q

What is the max cable run for Modbus Plus?

A

1500 ft (450m).

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24
Q

What connector is used for UTP Ethernet?

A

RJ45 (Pins 1, 2, 3, 6 for Tx/Rx).

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25
Is Modbus synchronous or asynchronous?
Asynchronous.
26
In what OSI layer is TCP in Modbus TCP?
Layer 4 (Transport).
27
What does HART stand for?
Highway Addressable Remote Transducer.
28
How many wires does a standard 4-20mA HART system use?
2 wires (power + communication).
29
How does HART transmit digital data over analog signals?
FSK (1200 Hz for "1", 2200 Hz for "0").
30
What is TDMA’s role in WirelessHART?
Assigns time slots for collision-free communication.
31
What are the three types of HART commands?
Universal, Common Practice, and Device-Specific.
32
What distinguishes HART-IP?
Extends HART over Ethernet/IP networks for speed and scalability.
33
What replaces OSI layers 4-6 in FF?
Fieldbus Access Sublayer (FAS).
34
What is the baud rate of FF HSE?
10 Mbps to 10 Gbps.
35
What is the modulation technique for FF HSE?
Manchester encoding.
36
What is the max number of bus-powered FF devices?
16
37
What is the arbitration method for PROFIBUS?
Master/Slave with token passing.
38
What does DP stand for in PROFIBUS?
Decentralized Peripherals.
39
What does PA stand for in PROFIBUS?
Process Automation.
40
What is the max segment length for PROFIBUS DP?
1200 meters.
41
What is the data concentrator for WirelessHART?
Gateway
42
What is the topology for WirelessHART?
Mesh
43
What is the arbitration method for Modbus TCP?
Master/Slave and CSMA/CD
44
What is the framing method for Modbus TCP?
IEEE 802.3
45
How many masters/slaves can be on a Modbus TCP network?
1 master and up to 31 slaves.
46
What error-checking method uses a 17-bit polynomial in Modbus?
CRC (Cyclic Redundancy Check).
47
What does ODVA stand for?
Open DeviceNet Vendors Association.
48
What is the routable version of DeviceNet?
Ethernet/IP
49
What is the primary advantage of FF over 4-20mA systems?
Multidrop capability and bidirectional digital communication
50
What are the three classes of FF function blocks?
Basic, Enhanced, and Extended.
51
What is the purpose of Device Descriptions (DD) in FF?
Describes function block parameters and configuration procedures
52
What is a Capabilities File in FF?
A text file for offline device configuration, storing parameters.
53
What is the IEC standard for FF physical layer?
IEC 61158-2
54
What is the signal encoding method for FF H1?
Manchester II
55
What is the voltage range for FF H1 signals?
0.75–1 V peak-to-peak on a DC bias (9–32 V)
56
How many repeaters are allowed in an FF network?
4 (max 9500m total length)
57
What is the primary cause of failures in field devices?
Sensors (48%).
58
What is the benefit of FF’s digital accuracy over analog?
IEEE floating-point precision (7 digits) vs. 12-bit analog (0.2–1% error).
59
What is the main advantage of predictive maintenance with FF?
Reduces unplanned outages and inventory costs
60
What detects impulse line plugging in FF transmitters?
Fluctuation analysis of high/low pressure signals.
61
What is the function of EDDL in FF?
Standardizes device descriptions for host interoperability
62
What are the two types of FF device couplers?
Passive ("Blocks") and Active ("Fieldbus Barriers")
63
What is the grounding rule for FF networks?
Single-point grounding (shield not used as power conductor)
64
What are the three FF device types?
Basic, Link Master, and Bridge
65
What is the address range for FF field devices?
Permanent addresses (16–247), Temporary (248–251), Visitor (252–255)
66
What is the purpose of bridging in FF?
Connects H1 segments to HSE backbone (e.g., Linking Device)
67
What is the arbitration method for HART?
Master/Slave with token passing
68
What is the FSK frequency for "1" in HART?
1200 Hz
69
What is the FSK frequency for "0" in HART?
2200 Hz
70
What is the primary difference between HART and FF?
HART is hybrid (analog + digital), FF is fully digital/multidrop
71
What is the max spur length for FF with 2–12 devices?
120 meters (Type A)
72
What is the IEC standard for PROFIBUS PA physical layer?
IEC 61158-2 (same as FF H1)
73
What is the max devices per PROFIBUS DP segment?
32
74
What is the data rate for PROFIBUS DP?
Up to 12 Mbps
75
What is the primary advantage of Modbus TCP over RTU?
Faster, scalable over Ethernet, and supports multiple masters.
76
What is the role of DHCP in FF HSE?
Dynamic address assignment for devices.
77
What is the main drawback of 4-20mA systems?
Point-to-point wiring and limited data (one variable)
78
What is the main advantage of smart instruments?
Two-way communication and multiple variables
79
What is the primary roadblock to FF implementation?
Cultural resistance to change and cost perception
80
What is the purpose of ITK in FF?
Interoperability Test Kit for device certification
81
How does the HSE protocol stack ensure device interoperability?
By using common networking protocols and DHCP for dynamic addressing.
82
What protocol does DeviceNet and Ethernet/IP use for session, presentation, and application layers?
Common Industrial Protocol (CIP).
83
What does DeviceNet use for the Data Link Layer of the OSI model?
Controller Area Network (CAN).
84
What network topology does DeviceNet use?
Trunkline-Dropline.
85
What is the maximum data rate of DeviceNet?
500 Kbps.

DCS last sem (5 decks)

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