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SCADA

SCADA. Contents. Introduction Hardware Architecture Software Architecture Functionality Conclusion References. Introduction. What is SCADA? What is data acquisition? Where and why, use of SCADA? Application area :

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SCADA

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  1. SCADA

  2. Contents.. • Introduction • Hardware Architecture • Software Architecture • Functionality • Conclusion • References

  3. Introduction • What is SCADA? • What is data acquisition? • Where and why, use of SCADA? Application area : • Industrial processes : chemical, power generation and distribution, metallurgy, … • Nuclear processes : reactors, nuclear waste, ... • Experimental physics : HEP laboratories • Application size: • 20 k I/O to 450 K I/O, • 1 M I/O under development

  4. Supervisory Data Acquisition Control Distributed database Data Server Data Server PLC’s Field Bus ERP Systems Expert Systems SCADA ? And Archiving, Logging, Access Control, Alarms Graphics and Batch processing ControlPrograms

  5. Architecture • Hardware • Software

  6. Hardware Typical Hardware Architecture

  7. Software Architecture

  8. Software Architecture • Communication Internal Communication Access to Devices • Interfacing H/W • Multiple communication protocols supported in a single system • Support for major PLCs/DCSs but not VME S/W • API • ODBC, DDE and OLE I/F to PC Products • OPC Client and OPC Server • ActiveX Containers • Scalability • Database Configuration DB, alarm DB, Archive DB, log DB and RTDB resides in the memory of the servers

  9. Functionality • Generic SCADA functionality • Access Control, • MMI, • Trending, • Alarm Handling, • Logging, Archiving, • Report Generation, • Automation.

  10. Functionality Contd.. • Access Control Users - allocated to groups group - defined read/write access • MMI multiple screens library of standard graphical symbols dragged and dropped zooming, re-sizing, scrolling... Links - pages to navigate

  11. Functionality Contd.. • Trending based on parameters on specific chart can be predefined or defined on-line more than 8 trended parameters per chart both real-time and historical trending zooming and scrolling • Alarm Handling based on limit and status checking handled centrally E-mailscan be generated

  12. Functionality Contd.. • Logging, Archiving • Data stored in compressed and proprietary format • Logging / Archiving either for a set number of parameters or for a set period of time • Logging / Archiving can be frequency or event driven * • Logging of user actions together with a user ID • VCR facility for playback of stored data • Writing logs into RTDB • Report Generation • Reports created using SQL type queries to the RTDB or logs • Automatic generation, printing and archiving of reports • Use of ‘components’ for report generation

  13. Functionality Contd.. • Automation triggered by events defined in scripting languages send e-mail ,write into RTDB recipes Sequencing

  14. Development Tools • Project editor • Graphics editor • Configuration through parameter templates • Scripting language • Driver Development Tool Kit • And more…

  15. Data Access Mechanism's Alarm Server • Alarm Server typically poll data from the data server ( -> impact on network bandwidth) More advanced techniques like publish / subscribe are available in some cases • Data from field buses are mainly polled Data Server Polling Polling Field Bus

  16. Conclusion • SCADA is a control system with • More frond end functionality • More interfaces and efficient storage • More record or device oriented configuration • but System wide configuration tools are needed • are less expensive than DCS, but offer different functionality than DCS • And finally various applications

  17. References • www.scadanews.com • www.princeton-indiana.com/wastewater/pages/scada/scada-overview.html • www.ref.web.cern.ch/ref/CERN/CNL/2002/003/scada/ • www.sss-mag.com/scada.html • www.scada.com

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