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DCS ArchitectureDCS Architecture

The Feedback Loop

Load change

Controller Final control elementProcess

ControlledvariableSetpoint

Manipulatedvariable

element

Sensor &Sensor &Transmitter

A. Ismail DCS architecture 2

A. Ismail DCS architecture 3

Transmitter & Valve

A. Ismail DCS architecture 4

The Feedback Loop

A. Ismail DCS architecture 5

PID Controller Implementation

A. Ismail DCS architecture 6

A. Ismail DCS architecture 7

A. Ismail DCS architecture 8

Traditional Feedback Loops

A. Ismail DCS architecture 9

Traditional Control Panel

A. Ismail DCS architecture 10

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Common Industrial Controllers

Stand-alone controller (loop controller)(loop controller)

Programmable logic controller (PLC)controller (PLC)

Distributed control system (DCS)system (DCS)

A. Ismail DCS architecture 12

Stand Alone Controller

A. Ismail DCS architecture 13

DCS

A. Ismail DCS architecture 14

A. Ismail DCS architecture 15

The Control Station

A. Ismail DCS architecture 16

PID Controller

A. Ismail DCS architecture 17

DCS Feedback Loops

A. Ismail DCS architecture 18

Control Room from 1955

A. Ismail 19DCS architecture

Control Room from the 80sControl Room from the 80s

A. Ismail DCS architecture 20

Control Room from 2011

A. Ismail DCS architecture 21

DCS Architecture

VDU VDUOperatorsconsolesconsoles

Control network

Control station Additionalcontrollers

Special purposeprocessors

(ESD MCC BMS)I/O I/O I/O

To/from field devices

(ESD, MCC, BMS)

A. Ismail DCS architecture 22

A. Ismail 23DCS architecture

The Big Picture

A. Ismail DCS architecture 24

A. Ismail DCS architecture 25

More

A. Ismail DCS architecture 26

A. Ismail DCS architecture 27

Operator Console

A. Ismail DCS architecture 28

Process Visualization

A. Ismail 29

A. Ismail DCS architecture

Faceplate

A. Ismail DCS architecture 33

DCS vs. PLC

Advancedregulatory controlcontrol DCS

High-speedPLC

machinecontrol

Digital Analog I/Os

A. Ismail DCS architecture 34