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JIET SCHOOL OF ENGINEERING AND TECHNOLOGY FOR GIRLSA SEMINAR ON :PLC AND SCADASUBMITTED TO:PROF. JITENDRA PRAJAPATSUBMITTED BY:DEEPIKA MANGLIYA12EJTEX022Contents:PLCSCADAConclusionPLCWhat is PLC?History of PLCMajor components of PLCOperational sequence of PLCLadder logicExample of starting and stopping of a motorAdvantagesDisadvantages

3 What is PLC? PLC is a digital computer designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. A PLC is an example of a real time system. History of PLCPLC was introduced in late 1960sFirst commercial & successful Programmable Logic Controllers was designed and developed by Modicon as a relay replacer for General Motors.Earlier, it was a machine with thousands of electronic parts.Later ,in late 1970s,the microprocessor became reality & greatly enhanced the role of PLC permitting it to evolve form simply relay to the sophisticated system as it is today. Programming Languages of PLC Most common languages encountered in PLC programming are: 1) Ladder Logic 2) Functional Block Diagram 3) Sequential Function Chart 4) Boolean mnemonicsLadder Logic The ladder logic is the oldest programming language for PLC. It is well suited to express Combinational logic.The main ladder logic symbols represent the elements :

make contactbreak contactrelay coilBlock diagram of a PLC

OutputsLEDsInputs8Advantages of PLCs:

Reliability.Flexibility in programming and reprogramming.Cost effective for controlling complex systems.Small physical size, shorter project time.High speed of operation.Ability to communicate with computer systems in the plant.Ease of maintenance /troubleshooting. Reduced space. Energy saving.

Disadvantages of PLCsPLC devices are proprietary it means that part or software of one manufacturer cant be used in combination with parts of another manufacturer.Limited design and cost optionFixed Circuit Operations.PLCs manufacturers offer only closed architectures.SCADA

IntroductionArchitectureHardwareSoftware architecturefunctionalityDevelopment tools

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 laboratoriesApplication size: 20 k I/O to 450 K I/O, 1 M I/O under development

21-Aug-15SCADA12Architecture Hardware Software 13SCADA architectureThird Generation Networked

Hardware21-Aug-15SCADA15

Typical Hardware Architecture Software Architecture CommunicationInternal CommunicationAccess to DevicesInterfacingH/WMultiple communication protocols supported in a single systemSupport for major PLCs/DCSs but not VME

S/WAPIODBC, DDE and OLE I/F to PC ProductsOPC Client and OPC ServerActiveX ContainersScalability

DatabaseConfiguration DB, alarm DB, Archive DB, log DB and RTDB resides in the memory of the servers 21-Aug-15SCADA16Functionality Generic SCADA functionalityAccess Control,MMI,Trending,Alarm Handling,Logging, Archiving,Report Generation,Automation.

21-Aug-15SCADA17Functionality Contd..Access Control Users - allocated to groups group - defined read/write accessMMI multiple screens library of standard graphical symbols dragged and dropped zooming, re-sizing, scrolling... Links - pages to navigate 21-Aug-15SCADA18Functionality 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

21-Aug-15SCADA19Development ToolsProject editorGraphics editorConfiguration through parameter templatesScripting languageDriver Development Tool KitAnd more21-Aug-15SCADA20Conclusion:Wherever automation is desired the PLCs are best suited to meet the task.

Few examples of industries where PLCs are used : 1) Robots manufacturing and control 2) Car park control 3) Train control station system 4) Food processing 5) Materials handling 6)Machine tools 7)Conveyer system etc.

21-Aug-15SCADA22SCADA is a control system with

More frond end functionalityMore interfaces and efficient storage More record or device oriented configurationbut System wide configuration tools are neededare less expensive than DCS, but offer different functionality than DCSAnd finally various applications

Queries?Thank you