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INST 335 > INST 317 - Module 1 & 2 > Flashcards

INST 317 - Module 1 & 2 Flashcards

(77 cards)

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1
Q

Steps to program PLC/RTU

A
  1. Control Strategy/Narrative
  2. Tags, I/O
  3. Controller type
  4. Program
  5. Test and Download
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2
Q

number of physical SCADAPACK 32 AI

A

8 30001-30008 Input

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3
Q

number of physical SCADAPACK 32 DI

A

16 10001-10015 Status

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4
Q

number of physical SCADAPACK 32 DO

A

12 1-12 Coil

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5
Q

What are the Coil registers in a SCADAPack 32 and type of I/O

A

00001-04096
DO

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6
Q

What are the Status registers in a SCADAPack 32 and type of I/O

A

10001-14096
DI

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7
Q

What are the Input registers in a SCADAPack 32 and type of I/O

A

30001-39999
AI

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8
Q

What are the Holding registers in a SCADAPack 32 and type of I/O

A

40001-49999
AO

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9
Q

Which type of I/O are readable only and which types are
read//write

A

Read Only - AI/DI
Read/Write - AO/DO

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10
Q

For timers what are:
The preset value
The accumulated value
The time base

A

The preset value
(Which is the constant number of seconds the timer times to, before being energized or de-energized)

The accumulated value (Which is the number of seconds which records how long the timer has been actively timing)

The time base (Which indicated the accuracy in seconds to which the timer
operates e.g. 1 second, 0.1 seconds and even 0.01 seconds)

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11
Q

What is a retentive timer?

A

Accumulator holds value even if input goes to low

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12
Q

3 Types of timers

A

ON delay
Off Delay
Retentive

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13
Q

3 Types of Counters

A

CTU - Count up
CTD - count down
CTUD - count up down

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14
Q

5 Parts of a SCADA system

A
  1. Feild devices
  2. RTU
  3. Communications
  4. MTU
  5. User Interface
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15
Q

Describe the function of SCADA

A
  1. Display
  2. Trend (history)
  3. Alarms
  4. Reporting
  5. Animation
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16
Q

5 Parts of a SCADA system

A

Field-level instruments
Marshalling terminals and RTUs
Communications
Master Station
Commercial data processing system

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17
Q

Describe the function of SCADA

A

Alarm management and areas of responsibility
Trending and plotting
Reporting
Event recording (Audit Trails)
Display Building

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18
Q

difference between RS232 RS485

A

RS232 is only point to point
RS485 is point to multipoint

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19
Q

Max Distance for 1-5V
Max Distance for RS232

A

15m

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20
Q

Max Distance for Rs485

A

1200m

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21
Q

Ethernet

A

100m

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22
Q

What is the function of WDT

A

Watch dog timer
Ensure the CPU of the system has not frozen

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23
Q

What is a sink or source in terms of a modules

A

Sink - Draws from a source
Source - Outputs

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24
Q

What are the horizontal and vertical lines of ladder logic called

A

Horizontal - Rung
Vertical - Rail

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25
Define SCADA
A system containing a number of RTUs that collect field data and which are connected to the Master station, using a communications system
26
DCS
The data acquisition and control functions performed by a number of microprocessor-based units, distributed by the devices being controlled
27
PLC
A programmable logic controller that uses ladderlogic software and solid state electronic modules for both input and output
28
OPC
Object Process Control
29
OLE
Object Linking and Embedding
30
What is an Isolated card and what are the types
Input kept separate from the card Optical, Relay and Transformer
31
CSMA
Carrier select multiple access
32
AI_1 unity pro address
%IWO.4.0 - %IWO.4.5
33
DO_1 unity pro address
%QO.3.0 - %QO.3.14
34
Modbus may have ___ salve adress
247
35
field bus protocol includes
digital signals using digital transmitter if FF comms fail loop fails
36
token passing protcol with a large number data transfer is:
relatively slow
37
the shield on belden cable must be grounded at
the receiver
38
most common form of digital communication
serial
39
most common form of digital communication
serial
40
modbus uses what method for media access
polling
41
demodulation is what?
separation of data from a carrier signal
42
8 bit extended ascii consists of
256 distinct characters
43
4 areas of improvement in SCADA
Rapid improvement in LAN technology for master stations Man machine interface Remote terminal units Communications
44
how to connect shield?
connect only 1 end
45
What is Function code 01
read discrete output
46
What is Function code 05
write single discrete output
47
What is Function code 15
write multiple discrete outputs
48
What is Function code 02
read discrete input
49
What is Function code 04
read input register
50
What is Function code 03
read analog output
51
What is Function code 06
write single analog output
52
What is Function code 16
write multiple analog output
53
What 5 components make up an analog in
Input multiplexer Input signal amplifier Sample and hold circuit A/D converter Bus interface and board timing system
54
Analog output module typical has
8 analog outputs Resolution of 8 or 12 bits Conversion rates of 10 microseconds to 30 milliseconds Outputs range from 4.20 mA +- 10 volts
55
typical analog input has
8 or 16 analog inputs Resolution of 8 or 12 bits Range of 4-20mA Input resistance of 240 Kohms to 1 Mohm Conversion rates of 10 microseconds to 30 milliseconds Inputs are generally single ended
56
what is a dry contact card
card has power supplied from the terminal strip on the card.
57
what is an isolated card
card has power supplied from an external power supply
58
Describe the operating and safety conditions for power sources
Operating Temp: -40 to + 75 C. Use rechargable lithium battery to provide more reliable clock backup. Some RTUs have multiple auxiliary voltage outputs to provide power to communication modems and sensors, some of these outputs are adjustable via RTU application. Heat convention cooling help maitaining the internal tempreture in the power supply and hence boost its operating reliability. Controlled powerline to DO modules enables centralized inhibiting of all relay outputs in the selected DO modules. Short current limit on the outputs help protecting the power supply and backup battery in case malfunction of the connected devices. Status LED’s in the front panel helps simple and visyual indication of the power supply out put connections and detecting some types of malfunctions. Automatically switches the power suppply operation to the backup battery when the main power source fails Upon main power’s availability (reconnection) the power supply provides automatic switchjover to main power and start recharging the backup battery. Optimized temprature compensated charging provides over charging protection and over disharge and overheating protection of the backup battery.
59
Summarize the causes of leaks in a pipeline
Pipeline corrosion and wear Operation outside of design limits Unintentional third party damage Intentional damage
60
Failure to detect leaks can be broken into 4 loss categories
Loss of life and property Loss of product and downtime to fix pipeline Environmental impact Fines and legal suits
61
Describe the main methods used in detection of gas and/or oil leaks in a pipeline
Physical inspection of the area Add an odorant Line flow calculations Line pressure measurement Noise detection
62
Describe the main methods used in detection of gas and/or oil leaks in a pipeline
Pigging Computer based
63
what is pipeline leak Noise detection
There is an increase in noise of the pipeline when there is a leak
64
AGA No. 3 and AGA No. 7
are methods of calculation gas flow.
65
AGA reports are used to describe
how to measure the flow of natural gas.
66
AGA 8 was published in
1985 and revised in 1992
67
AGA Report No. 7
Measurement of gas by axial-flow turbine meters
68
AGA Report No. 3
Orifice Metering of Natural Gas and other hydrocarbon fluids 1985 version Developed for pipe-tap orifice meters 1992 version Developed only for flange-tap orifice meters Calls for use of AGA No. 8 to calculate supercompressibility
69
AGA Report No. 8 – 1985 Version
Allows for variations in gas compositions Gas analysis should fall into a range of values provided in the report. Allows for an alternate method which uses a partial gas composition.
70
AGA Report No. 8 – 1992 Version
Allows for wide variations in gas compositions Gas analysis should fall into a normal range of values or an expanded range of values.
71
RTUs should be able to handle multiple communication media
RS-232/RS-442/RS-485 Dial-up Microwave Satellite Radio
72
There are to typical network configurations for wireless telemetry radio-based systems
Point-to-point Point-to-multi-point
73
Point-to-point is the
simplest set-up, one stations is setup as the master and the other is the slave to allow for data to be exchanged between two station
74
Polled system
Master is in total control and makes regular polls of the data (sends and receives data) to each slave in sequence Slave responds to the master only when a request is received Also known as half-duplex
75
Describe Satellite communication methods
Satellite – fixed services (point-to-point) provide microwave radio technology, consists of two main components, the ground segment which is a fixed or mobile transmission, reception, and ancillary equipment and the space segment which is the actual satellite
76
Describe Microwave communication methods
Wider bandwidth Faster data speeds Multiple links allow for redundant paths Usually has Txfer/Rxfer redundancy Higher Cost
77

INST 335 (2 decks)

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