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SCADA SCADA Presentation Transcript

  • SCADA by Prasad Mane (05IT6012) School of Information Technology
  • 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 :
          • 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
  • SCADA ? A nd Graphics and Batch processing Archiving, Logging, Access Control, Alarms Control Programs ERP Systems Expert Systems Data Server S upervisory C ontrol D ata A cquisition Distributed database PLC’s Field Bus Data Server
  • Architecture
    • Hardware
    • Software
  • Hardware Typical Hardware Architecture
  • Software Architecture
  • 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
  • Functionality
    • Generic SCADA functionality
        • Access Control,
        • MMI,
        • Trending,
        • Alarm Handling,
        • Logging, Archiving,
        • Report Generation,
        • Automation.
  • 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
  • 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-mails can be generated
  • 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
  • Functionality Contd..
    • Automation
    • triggered by events
    • defined in scripting languages
    • send e-mail ,write into RTDB
    • recipes
    • Sequencing
  • Development Tools
    • Project editor
    • Graphics editor
    • Configuration through parameter templates
    • Scripting language
    • Driver Development Tool Kit
    • And more…
  • Data Access Mechanism's
    • 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
    Field Bus Data Server Alarm Server Polling Polling
  • 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
  • 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