Scada
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This document discusses supervisory control and data acquisition (SCADA) systems. It describes the typical hardware and software architectures of SCADA, including distributed databases, data servers, programmable logic controllers, and field buses. The document outlines common SCADA functions such as access control, human-machine interface, trending, alarm handling, logging, archiving, report generation, and automation. It also mentions SCADA development tools and data access mechanisms. In conclusion, the document states that SCADA systems offer more front-end functionality, efficient storage, and device-oriented configuration than distributed control systems.
Scada
- 1. SCADA by Prasad Mane (05IT6012) School of Information Technology
- 2. Contents.. Introduction Hardware Architecture Software Architecture Functionality Conclusion References Jul 16, 2009 SCADA 2
- 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 Jul 16, 2009 SCADA 3
- 4. ERP Systems SCADA ? Expert Systems Supervisory Data And Acquisition Control Archiving, Logging, Graphics and Batch processing Access Control, Alarms Distributed database Data Server Data Server PLC’s Field Bus Control Programs Jul 16, 2009 SCADA 4
- 5. Architecture Hardware Software Jul 16, 2009 SCADA 5
- 6. Hardware Typical Hardware Architecture Jul 16, 2009 SCADA 6
- 7. Software Architecture Jul 16, 2009 SCADA 7
- 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 Jul 16, 2009 SCADA 8
- 9. Functionality Generic SCADA functionality Access Control, MMI, Trending, Alarm Handling, Logging, Archiving, Report Generation, Automation. Jul 16, 2009 SCADA 9
- 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 Jul 16, 2009 SCADA 10
- 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-mails can be generated Jul 16, 2009 SCADA 11
- 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 Jul 16, 2009 SCADA 12
- 13. Functionality Contd.. Automation triggered by events defined in scripting languages send e-mail ,write into RTDB recipes Sequencing Jul 16, 2009 SCADA 13
- 14. Development Tools Project editor Graphics editor Configuration through parameter templates Scripting language Driver Development Tool Kit And more… Jul 16, 2009 SCADA 14
- 15. Data Access Mechanism's Alarm Server Alarm Server typically poll data from the data server ( -> impact on network Data Server bandwidth) Polling More advanced techniques like publish / subscribe are available in some cases Po l l in g Data from field buses are mainly polled Field Bus Jul 16, 2009 SCADA 15
- 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 Jul 16, 2009 SCADA 16
- 17. References www.scadanews.com www.princeton-indiana.com/wastewater/pages/scada/scada-overview.h www.ref.web.cern.ch/ref/CERN/CNL/2002/003/scada/ www.sss-mag.com/scada.html www.scada.com Jul 16, 2009 SCADA 17