Component based software
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Engineering Cybernetics , NTNU 1 Component based software • Principle • Technologies • Examples Lars Imsland, NTNU [email protected]
description
Principle Technologies Examples. Component based software. Lars Imsland, NTNU [email protected]. “Build software from parts, not from scratch”. Principle. Reuse Pick the best components (“off-the shelf”-components) Use different languages Easy upgrade (precompiled components). Advantages. - PowerPoint PPT Presentation
Transcript of Component based software
Engineering Cybernetics , NTNU
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Component based software
• Principle• Technologies• Examples
Lars Imsland, NTNU
Engineering Cybernetics , NTNU
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Principle
• “Build software from parts, not from scratch”
File Edit Window HelpSales Forecast
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Sales Report
Sales Report: August 1996Territory: South EastUn its sold : 13,000Net Revenue $953,000Direc t Costs $450,000CommentsIncreased rainfall levels during June and Julycaused a surge in deman d for watering robots.Sales are up !
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7349
Cylinder head gasket setfor Ford Mercury Sable
$27.90
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Package PackageNewBuild
NewBuild
Workflow/Assembly
Component Delivery
Componentware
Legacy
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Advantages
• Reuse• Pick the best components (“off-the
shelf”-components)• Use different languages• Easy upgrade (precompiled
components)
Engineering Cybernetics , NTNU
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Technologies
• Microsoft COM (DCOM/COM+)• CORBA
– A specification, not implementation (OMG)– Platform independent
• Javabeans– The component model for Java
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Microsoft COM
• A specification and implementation• Microsoft specific• Most used• Network transparent (DCOM)• Communication specified with interfaces
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OPC - what is it?
• OPC is a specification that sets a standard for integration of real-time devices, PLCs or DCSs with business- or plant- applications
• OPC is based on COM– OPC is a set of COM interfaces
• OPC is network transparent
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OPC specifications
• Data access (v2.0)• Alarms and events• Historical data access• Batch• Windows CE
Engineering Cybernetics , NTNU
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Generalsimulator
Simulationmodel
OPC Server Interface
Communication network
OPC Client Interface
Controller
Estimator
MMI
WEB
Specification,
Criteria,
Reference,
Supervision
Industrial plant:
Communication network
OPC Server Interface
OPC Client Interface
Controller
Estimator
MMI
WEB
Specification,
Criteria,
Reference,
Supervision
Process Control System
IndustrialPlant
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Physical Process
• Refrigeration process• Well known• Suitable for different control strategies• Suitable for modeling and identification• Well instrumented (20 measurements, 4
controls)
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Physical Process II
Expansionvalve
EvaporatorCondenser
Compressor
MMotor
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Communication architecture
PLC
Ethernet
OPC ClientControllerSupervisor
OPC Data Server (NT)PLC softwareLocal MMI
Web-browsersomewhere onthe internet
APIS/SIPPrediktor AS
“Home-made” components
WinCCSiemens
S7-400Siemens
Netscape,Internet
Explorer,etc.
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Infrastructure
Physical Process• Refrigeration process
• Instrumented
Controller• PLC
• PC
• Intranet
Supervision• PC
• Intranet
• Internet
