Contents

• Introduction
• Principles of SOAP Web Services
  • XML - Extended Markup Language
  • XML Schema
  • SOAP - Simple Object Access Protocol
  • WSDL - Web Services Definition Language
  • UDDI - Universal Description, Discovery and Integration
  
  
• Existing Solutions for SOAP Based Fieldbus Access
  • OPC - Object Linking and Embedding for Process Control
  • oBIX - Open Building Information Exchange
  • BACNet/WS - Web Services for Building Automation and Control Networks
  • Echelon i.LON 100 SOAP/XML Interface
  
  
• Representing Information in Different Fieldbus Systems with SOAP
  • Generalized Fieldbus Interfaces
  • Application Specific Interfaces
  • Representing Fieldbus Data and Services with SOAP
  • Handling of Latency and Timing Issues
  • Other Internet/Fieldbus Gateway Issues
  
  
• SOAP Front end Design for the IGUANA Gateway
  • The IGUANA Gateway
  • Encapsulating the IGUANA Protocol into SOAP Messages
  • Representing the IGUANA Interface with an XML compliant OPC standard
  • Web Service Compliant Fieldbus Applications on the IGUANA Gateway
  
  
• Implementation of an OPC XML-DA Compliant SOAP Web Service on the IGUANA Gateway
  • Choosing an Appropriate SOAP Framework
  • Parsing OPC XML-DA Compliant SOAP Messages
  • Implementing OPC Server Functionality
  • Handling of the IGUANA Protocol
  
  
• Analysis of the SOAP Protocol in Internet/Fieldbus Gateways
  • Compatibility and Interoperability of an OPC server on the IGUANA gateway
  • Performance and Scalability of the IGUANA OPC Server
  • Efficiency of the SOAP Protocol in Fieldbus Access
  
  
• Conclusion and Future Work
• Bibliography

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