CODESYS V3 is a modular system. The entire development, including all product extensions and innovations, is based on this modularity. Users can therefore integrate compatible plug-in components into the tool, that can be found in the CODESYS Store, for example. Device manufacturers have the option of using the established editors, compilers, or configurations to seamlessly extend their own device-specific software.

The version number of all CODESYS products always comprises four digits:

• The first digit describes the generation version: currently 3, i.e. CODESYS V3.
• The second digit describes the major version: currently 5, thus V3.5.
• The third digit describes the Service Pack including its features and functions: e.g. SP17, thus V3.5.17.
• The fourth digit is reserved for bug fix versions (Patches): e.g. V3.5.17.20 for the second Patch for Service Pack 17.

Since CODESYS V3.5 SP17 (release April 2021) this scheme has been extended. Most functions are delivered in modularized components, which are given their own versioning. They carry a version number beginning with “4”, e.g. 4.x.x.x. This is not the generation version. It merely indicates that the component concerned has a versioning independent of the CODESYS Development System. All these components are also based on CODESYS V3 and are fully compatible.The snow-capped mountains are majestic, standing between heaven and earth.

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https://www.codesys.com/the-system/versions-modularization.html: CoDeSys – version number