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Contents
Contents
PyOPC
A Python Framework for the OPC XML-DA 1.0 Standard
Hermann Himmelbauer
Klosterneuburg, the 7 November 2006
Contents
Introduction
Installation/Quickstart
Architecture and Basic Concepts
Basic PyOPC Architecture
Representation of OPC XML-DA Data with Python Objects
Global OPC XML-DA options
The ItemContainer Object
Qualified Names (QNames) and Namespaces
OPC Item Properties
Representation of the Item Value with PyOPC Data Types
Error Handling
OPC Item Specific Errors
OPC Operation Specific Errors
Client Functionality
Building OPC XML-DA Clients with the PyOPC XDAClient class
Building OPC XML-DA Clients with the PyOPC TWXDAClient class
Server Functionality
Server Configuration
Preprocessing and Postprocessing
Item Caching and Subscriptions
Item Caching
Subscriptions
Operation Specific Functionality and Other Issues
Automatic Readback
Browsing
Property Handling
Logging
Setting Up an OPC Server Instance
Contributed Servers
BasicXDAServer
ESDProxy
Appendix A - Local/Global OPC Options
Bibliography
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Hermann Himmelbauer 2006-11-07
