DCS Architecture DCS Architecture
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DCS ArchitectureDCS Architecture
The Feedback Loop
Load change
Controller Final control element
Process
ControlledvariableSetpoint
Manipulatedvariable
element
Sensor &Sensor &Transmitter
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Transmitter & Valve
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The Feedback Loop
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PID Controller Implementation
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Traditional Feedback Loops
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Traditional Control Panel
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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)
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Stand Alone Controller
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DCS
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The Control Station
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PID Controller
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DCS Feedback Loops
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Control Room from 1955
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Control Room from the 80sControl Room from the 80s
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Control Room from 2011
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DCS Architecture
VDU VDUOperators’consolesconsoles
Control network
Control station Additionalcontrollers
Special purposeprocessors
(ESD MCC BMS)I/O I/O I/O
To/from field devices
(ESD, MCC, BMS)
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The Big Picture
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More…
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Operator Console
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Process Visualization
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Faceplate
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DCS vs. PLC
Advancedregulatory controlcontrol DCS
High-speedPLC
machinecontrol
Digital Analog I/Os
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