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What is the difference between including a library in a CoDeSys project and including a placeholder template? And why can't certain libraries be added as libraries as opposed to placeholder templates? For example, I can't seem to add the Standard Library (System) as a library, only a placeholder template.

In the image below the CCAux library is added as a library where as the CmpApp library is a placeholder. If you open the 'placeholders' tab you do not see the CCAux library in there but you will find the CmpApp. What is the difference between these two?

Libraries

placeholders

Michael LeVan
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  • I cannot get your question. How is that related? Libraries you add in library manager, placeholders in visualization. Those are completely different entities. – Sergey Romanov Nov 26 '19 at 04:58
  • @SergeyRomanov It would appear you did understand my question a bit. It turns out I didn't know enough to know my question wasn't specific. I added some images and a more specific question to the post. Thanks. – Michael LeVan Nov 26 '19 at 22:48

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Placeholders are not realy an library element, but can be used to personalize Your library as You can associate them to a library element and apoint what version of the library is to be used to resolv that Placeholder. A better explanation can be found on this link:

https://infosys.beckhoff.com/english.php?content=../content/1033/tc3_plc_intro/27021601953748491.html&id=

The document has images that can help You undestand. There are more information in subfolders appointed by the link above.

José Marcos Moraes
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