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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: 

reading an entire file into a pre defined buffer or

read file chuncks into a smaller and optimized buffer (as long as the buffer allows for parsing).
method pro con
entire file read into buffer fast and relatively easy to implement Larger PLC memory requirement due to loading the file into a pre-allocated memory-buffer
partial read file into buffer 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 be used as starting point for your specific needs.

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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