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1. DCS is process oriented while SCADA is data oriented.
2. DCS concentrates on Control Processes and present the data to user/ operator while SCADA concentrates on requirements of Control Unit.
3. SCADA maintains a database while DCS is always connected to its data source, hence no need of database.
4. DCS has a closed-loop Control system at PCS/RTU level while SCADA does not have it.
> Most DCS and SCADA systems today come with same standard facilities like events, archiving, HMI, reporting, DB management & logging as well as remote Control centers.
for self study in detail please visit:
http://control.com/thread/1365080091
