co📁e - XML File Handling

aliazzz hermsen
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co📁e - XML File Handling

A simple yet flexible library to compose or parse XML data in CODESYS based PLC's via the following function blocks;

  • FB_Filecontrol: provides a generic and easy way to open, close, read, write files without hassle.
  • FB_StreamBuffer: provides a generic and easy way to compose file contents, this enables you to build your own file content parser more efficiently.
  • FB_XmlControl: provides a complete solution to read, write, parse and compose xml-based files.

The solution can handle xml-parsing in two ways:

1) Reading an entire XML file into a pre-allocated memory-buffer
2) Read partially chunks into a smaller and optimized buffer

chosen method advantage disadvantage
1 fast and relatively easy to implement Larger PLC memory requirement due to loading the file into a pre-allocated memory-buffer
2 widely applicable due to small memory footprint relative slow parsing of large files. Relatively more complex to implement 
Examples for both parsing methods are provided, which can act as a starting point for your implementation

Download are hosted on github;
https://github.com/HAHermsen/co5e-XML-File-Handling

Basic library idea and coding: H.Hermsen.
bugfixes, testing: i-campbell and Aliazzz.
Additional small memory footprint file parsing: TimvH



co📁e - XML File Handling

https://www.linkedin.com/in/hahermsen

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