A distributed control system (DCS) is a control system where control elements are distributed throughout a plant or process. Honeywell and Yokogawa introduced commercial DCS systems in 1975. A DCS includes field devices, controllers, HMIs, historians, and redundancy. It provides a single database, easier redundancy, and mitigation of processor failures, though complex failure diagnosis and cost are limitations. Major DCS vendors include ABB, Emerson, Honeywell, Siemens, and GE.

2. Distributed ControlDistributed Control
SystemSystemSystemSystem

3. FundamentalsFundamentals
 A distributed control system (DCS) is a
control system for a process or plant,
wherein control elements are distributed
throughout the system.throughout the system.
 First industrial control computer system
was built 1959
 Honeywell andYokogawa introduced
commercial DCS’s in 1975

4. Hardware Elements of DCSHardware Elements of DCS
 Field Devices
 Controller
 HMI
 Historian and Alarm System
 Redundancy

5. DCS ArchitectureDCS Architecture
Courtesy: https://distributedcontrolsystem.wikispaces.com

6. DCS Interface:DCS Interface:
 Main Picture Interface
 Faceplate
 Alarms Alarms
 Process History Trend

7. DCS InterfaceDCS Interface

8. Faceplate:Faceplate:

9. Alarm HistoryAlarm History

10. Process HistoryProcess History

11. Merits of DCSMerits of DCS
 Single Database
 Mitigation of Processor Failure
 Easier Redundancy
 OperatorTraining

12. Limitations OF DCSLimitations OF DCS
 Complex failure diagnosis
 Cost
 Dependant on HMI

13. Major DCSVendorsMajor DCSVendors
 ABB Ltd.
 Emerson Electric Co.
 Honeywell International Inc.
 Siemens AG Siemens AG
 General Electric Co.

14. Any Questions ?Any Questions ?
Department of Chemical Engineering,
NFC IET,
Multan, Pakistan.