1. by Prasad Mane (05IT6012) School of Information Technology
SCADA by
Prasad Mane (05IT6012)
School of Information Technology

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

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
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SCADA

4. SCADA ? Data Supervisory And Acquisition Control Distributed database
ERP Systems
Expert Systems
SCADA ?
Data
Acquisition
Supervisory
Control
And
Archiving, Logging,
Access Control, Alarms
Graphics and Batch processing
Distributed database
(page is self describing while it is updating)
Special: Data server for fieldbus integration
Several drivers for many fieldbuses available
Data Server
Data Server
PLC’s
Field Bus
Control Programs
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5. Architecture
Hardware
Software
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6. Hardware
Typical Hardware Architecture
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7. Software Architecture
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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
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9. Functionality Generic SCADA functionality Access Control, MMI,
Trending,
Alarm Handling,
Logging, Archiving,
Report Generation,
Automation.
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10. Functionality Contd.. Access Control Users - allocated to groups MMI
group - defined read/write access
MMI
multiple screens
library of standard graphical symbols
dragged and dropped
zooming, re-sizing, scrolling...
Links - pages to navigate
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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
s can be generated
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12. Functionality Contd.. Logging, Archiving Report Generation
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
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13. Functionality Contd.. Automation triggered by events
defined in scripting languages
send ,write into RTDB
recipes
Sequencing
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14. Development Tools Project editor Graphics editor
Configuration through parameter templates
Scripting language
Driver Development Tool Kit
And more…
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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
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SCADA

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
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17. References www.scadanews.com
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SCADA