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

Contents.. Introduction Hardware Architecture Software Architecture Functionality Conclusion References 18-Sep-18 SCADA

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 18-Sep-18 SCADA

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 18-Sep-18 SCADA

Architecture Hardware Software 18-Sep-18 SCADA

Hardware Typical Hardware Architecture 18-Sep-18 SCADA

Software Architecture 18-Sep-18 SCADA

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 18-Sep-18 SCADA

Functionality Generic SCADA functionality Access Control, MMI, Trending, Alarm Handling, Logging, Archiving, Report Generation, Automation. 18-Sep-18 SCADA

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 18-Sep-18 SCADA

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 18-Sep-18 SCADA

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 18-Sep-18 SCADA

Functionality Contd.. Automation triggered by events defined in scripting languages send e-mail ,write into RTDB recipes Sequencing 18-Sep-18 SCADA

Development Tools Project editor Graphics editor Configuration through parameter templates Scripting language Driver Development Tool Kit And more… 18-Sep-18 SCADA

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 18-Sep-18 SCADA

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 18-Sep-18 SCADA

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 18-Sep-18 SCADA