SCADA-SIRIS (1)

8/6/2019 SCADA-SIRIS (1)

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A TECHNICAL

SEMINAR ONSupervisory Control And DataAcquisition System (SCADA)

ByD. Bhanu Sowjanya

&K.Ravi Kiran


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CONTENTS ABSTRACT HISTORY INTRODUCTION

SCADA NETWORK COMPONENTS MASTER TERMINAL UNIT (MTU) REMOTE TERMINAL UNIT (RTU) FACTORS CONSIDERED

APPLICATION OF SCADA CONCLUSION


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ABST

RACT

Supervisory control and data acquisition(SCADA) is a computer system for

gathering and analyzing real time data.SCADA system are designed to monitorand control a plant or equipment inindustries.

SCADA systems can also be programmedto automatically respond to changes insystem parameters, either by performingautomated actions or by sounding an

alarm, which can alert operators.


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HISTORY Supervisory control and data acquisition (SCADA) was first

developed in 1960 s. The technology of rockets and aircraft afforded man with

the opportunity to investigate weather and planetary data.However, for accurate weather prediction, more detailedinformation was needed from the atmosphere. There were

two questions to be answered. How could accurate data begathered from the atmosphere and communicated back to afacility on the Earths surface? And, how might data begathered from a number of sites in one centralized locationto record, analyze, and then predict the weather. On behalfof these questions, SCADA was developed and was

approved. Early SCADA systems used mainframe technology andrequired human operators to maintain by this increased thehuman labor cost.

Today SCADA system is generally much more automated,and consequently more cost efficient.


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INT

RO

DUCT

ION

SCADA systems are used not only in industrialprocesses: e.g. steel making,

power generation (conventional and nuclear) anddistribution, chemistry, but also in some experimental

facilities such as nuclear fusion. SCADA systems used torunon DOS, VMS, and UNIX; in recent years all SCADAvendors have moved to NT andsome also to Linux. SCADA provides an economic advantage. SCADA

becomes a better alternative to an operator orrepairmans visiting the site for adjustments andinspections. Distance and remoteness are two majorfactors for implementing SCADA systems. .


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SCADA 3000 Control Unit Sensaphone,

Inc.


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SCADANETWORKCOMPONENTS


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There are three major elements to a SCADA system: The Operator. Master Unit Terminal Communications ( MTU). Remote Unit Terminal (RTU).

The operator exercises control through information that isdepicted on a video display unit (VDU). Input to the system

normally initiates from the operator via the master terminalunits keyboard. The MTU monitors information from remote sites and displays

information for the operator. The relationship between MTU and RTU is analogous to master

and slave. Depending on the complexity the MTU may proceed

to a solution by trail and error method embedded in its

programming that allow it to make modifications to the systemto maintain optimality.


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The master terminal unit initiates all communication,gathers data, stores information, sends information toother systems, and interfaces with operators.

The MTU is a general-purpose platform like a pc, scadarunning software. The major difference between theMTU and RTU is that the MTU initiates virtually allcommunications by its programming and people.

Almost all communication is initiated. By the MTU. TheMTU also communicates with other peripheral devicesin the facility like monitors, printers or otherinformation systems.

MASTE

RTE

RMINAL U

NIT


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Inputs and Outputs for MTU


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Remote terminal units gather information fromtheir remote site from various input devices, likevalves, pumps, alarms, meters, etc. Essentially,data is either analog (real numbers), digital(on/off), or pulse data (e.g., counting revolutionsof meters).

Many remote terminal units hold the informationgathered in their memory and wait for a request

from the MT

U to transmit the data.

REMOTETERMINAL UNIT


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Inputs and Outputs for RTU


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Operation of SCADA

Applications of SCADA

Location used


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Factors to be considered for

selecting SCADA

Numbers of input/output points, Analogand Discrete.

Data transmission and communicationnetwork.

Control features.

Software and security issues General security issues Cost


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1.Number of i/o points, analog

and discrete

In building a customized SCADAsystem

oprepare a list of assets associatedwith particular utility.

o Identifying the operational parameters


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2. Data Transmission and

Communication Network Data transmission can be provided via two

primary channels:

Hardwired andwireless.

Three considerations when choosing theappropriate type of transmission system are

theSpeed of transmissionThe amount of data that can be

transferred, and cost.


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3)C

ontrolF

eatures

The control function of SCADA system is

achieved through use of PLCs. PLCs use a programming language called"relay ladder logic."


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4) Software and Security Issues

The SCADA software typically runs on IBMPC or compatible computers under

Microsoft Windows 95, 98, NT or2000operating systems.

Software packages compatible with otheroperating systems (e.g. UNIX) are also

available. The selection of software is such that itshould be capable of providing graphicaluser interface.


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Example of graphical user

interface


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5. General Security Issues

Security provided to SCADA system byconsidering some of the issues:

The ability to set up a passwordsystem.

The ability to trace logins.

Secure data transmission technology.


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6.cost

Cost for SCADA system can be dividedinto:

software cost

Hardware cost and

Installation cost


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Ohio River Valley Water Sanitation Committee Advanced

Measurement Initiative Monitoring Platform

The Ohio River Valley Water Sanitation Committee (ORSANCO),improvewater quality in the Ohio River and its tributaries, has set up a SC

monitor its system for volatile organic carbon contamination.


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CONCLUSION

SCADA systems can reliably monitorand control a process without requiringan operators supervision.

SCADA systems also allow you to count,totalize, trend, data log and calculatevaluable information about your process.


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QUERIES


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SCADA-SIRIS (1)

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