4/6/2024 0 Comments Programming in twincat 3There are currently three different versions of the library on my computer. In our example, I will add two different versions of the Tc3_JsonXml library to a project. In the following short post, I want to show how to add several versions of the same library to a project. If libraries are added via the standard dialog, placeholders are always used automatically. Each placeholder is linked to a library either with a specific version or so that the current library is always used. Instead of adding libraries directly to a project, they are referenced indirectly via placeholders. Placeholders for libraries are comparable with references. The mentioned problem can be solved by including different versions of the same library in the project using placeholders. This situation can be helpful if a library has to be updated in an existing project due to new functions, but the update turns out to give an older FB a changed behavior. Library placeholders allow to reference multiple versions of the same library in a PLC project.
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