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- 1. SCADA Systems - What is the scope of this talk? • What are SCADA systems? • What are their structure and main features? • How open are they? • How are they evolving? • How are they being evaluated? • Example System • Conclusions
- 2. What is a SCADA System? • Supervisory Control And Data Acquisition • Sits on top of process controllers (front-ends) • User tools to supervise and control the process • Used extensively in industry and also increasingly at CERN • Current application sizes from a few hundred I/Os to n*100000 I/Os • PC/NT-based
- 3. SCADA Structure • Tag-based (Tag=basic data item) • Distributed Systems • Server/Client over Ethernet (TCP/IP) • Polling of Front-End (Mostly)/Event Driven Internally • Often Proprietary Configuration, RT and Archive DBs
- 4. Basic Features (Development) • Integrated Development Environment – Graphics Editor – Database Editor – Report, Recipe and Script Editors • Toolkits – API – Driver Development
- 5. Basic Features (Run Time) • SC Data Acquisition Including Standard Drivers • Alarm Handling • Data Logging • Data Presentation (Synoptic/Trending) • Access Control • Redundancy • Network Connectivity • Report & Recipe Handling
- 6. Openness • API • OPC Client & Server • ODBC (OLEDB) • COM/DCOM • ActiveX • Web • ASCII/CSV (Configuration) • DDE
- 7. Evolution • Very fast evolution • Towards OO • Internal communication based on DCOM • MMI based on ActiveX • Web-based MMI • OPC for connection to H/W as well as OPC Server for connection to external systems • Increasing Application Size
- 8. Evaluation • Extensive Market Survey • 5 products being evaluated in a hands-on fashion • 2/3 more potentially interesting products • Test-bench • Evaluation findings to be presented at JCOP II Workshop in September http://itcowww.cern.ch/jcop/subprojects/TSurvey/ Shared disk on PCITCO04 (Scada Documents)
- 9. Power Supply Control System (Example) • Provide Suitable Connectivity • Configure Tags – Commands (Enable/Disable, On/Off) – Values (Status bits, Currents, Voltages) • Model Device Behaviour – Derived Parameters – Scripts (Internal Program) – API – PLC/VME • Configure Alarms and Logging • Configure MMI • Configure Automatic Generation of Report • Standard Access from Control Room via MMI • Remotely – Web – Dial-Up – Remote console software
- 10. SCADA Station Field Bus PS or Fan Tray SCADA Station Field Bus PLC PLC Protocol SCADA Station Field Bus PS Field Bus Node PS SCADA Station Field Bus PS Field Bus Node SCADA Station PLC PLC Protocol VME C P U I/ O Option A Option B Option C Option D Option E Ethernet PS or Fan Tray PS or Fan Tray PS or Fan Tray PS or Fan Tray PS or Fan Tray
- 11. Features Generally Not Provided (Currently) • FSM (Batch Management?) • Array Handling • Device Handling • Front-End S/W
- 12. Conclusions • SCADA systems provide many features required by LHC experiments • Are generally open • Are evolving very rapidly • Some features missing • Evaluation goals: – What is covered by SCADA? – Can missing features be easily added? • Results will be presented in JCOP II