DCS Cost Estimating

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DCS cost estimating


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Cost components

Hardware components

Operator console( CRTs, archiving discs, tapeunits, printers, engineering station)

Data highway( trafc director, interace or !"C)#ield mounted e$uipments("C%&s, D' units, *O

+les)

on hardware e$uipments

Sotware-con+guration, special displays etc

System integration, actory acceptance testing,documentation, pro.ect management, trainingmaintenance


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DCS De+nition

#irst step is to de+ne and si/e themain components o the system

0g1 2atch process

o 3 ully reduntant operatorconsoles(each containing 4 CRTs, 3printers, and one dis5)

o 6multiloop control units

o 3 D' multiple7ers

o

3 interaces or communication with!"C and com uter


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#iled mounted devices -8 sections

3 areas- own control and 'C

Tan5 arm 9 : control %tility area- : control

Storage area- !"C

*O re$uirements are identi+ed

'C provided with integral *O andpower supply


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Hardware estimate

Operators console and related items O2tain price lists rom a no1 o DCS suppliers

0sta2lish applica2le discount rates

0ngineer must +rst si/e and speciy the re$uired

system components, speciy their eatures and providethe type o data re$uired

:; Operator&s console-4 CRT&s and 5ey2oard1 >>>each

3; 'rchiving unit-6>>?@ hard dis5 and tape drive1>>> each

4; High speed hard copy printer1 >> each

6; 'n engineering station with intel 6AB processor, A>?@hard dis5, two dis5ette drives, color monitor,5ey2oard, laser printer1 >>>


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Communication Related items Determine the type o communication

networ5 re$uired Select the trafc director- appropriate or

num2er and type o devices supported2y the data highway

Speciy the interace devices (CO??)needed to connect the microprocessor*computer 2ased devices to DCS


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Sotware cost estimate

DCS manuacturers include only verysmall sum (>> to >>)- actuale7penditure is :>-4> times higher

Reason1 estimate does not include specialcontrol algorithms, graphic displays, orse$uencing re$uirements the pro.ects willhave;;---- supplier assume standard

sotware li2rary will sufce to support thepro.ect--- only include lin5ing o e7istingsotware 2loc5s


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multiple7ing and party linesystems

0na2le multiple signals to time sharecommon e$uipments( signalconditioners, communication

channels and data processinge$uipment)

Sharing or economic reasons-

perorming unctions se$uentially isnecessary than simultaneouse7ecution


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n the +gure

3-more input signals connected to a

switching mechanism can route any one o the signals

connected at the input terminals to

common output terminals- a driver mechanism operates the

switching mechanism

?ultiple7er terminal address decoderprovided

Shared signal conditioning e$uipment

npit can 2e either analog or digital


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Party line

Reers to method ocommunication

Commoncommunication

channel shared 2ye$uipments

't each station thee$uipment sends

and* or receivesinormation romother stationsalong part line

i i l l l i l i


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' station contains local multiple7ing systemsallowing multiple systems to share the station andpartly line- integral part

RT% share place din +led to minimi/e wiring costs2y perorming 2oth the multiple7ing and 'DClocally

RT% unctions

"ocal storing o data"ogging

timing,

Se$uential scanningchec5ing or alarm limits,

Thermocouple lineari/ation

reerence .unction compensation

Some limited computational capa2ility


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0ach measurement signal transmittedrom sensing element in the +led to thecontrol room on individual channelstypically pneumatic tu2ing or electricalconductors

Displayed on individual indicators Certain displays share 2y signals

0g1 multipoint thermocouple

0$uipment that selects and switches theindividual thermocouple leads was lesscostly than re$uired or separate

compensation


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DCS Cost Estimating

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