Creating vendor blocks for the application or a library
logi.CAD 3 provides the possibility to create vendor blocks in →C and integrate them in your custom →library. This section contains the best practice how to do this.
The interface for a vendor block
(= vendor →function block or vendor →function)
is created in an ST-object whereas t
he implementation for a vendor block is created in →C.
Usually, a vendor block will be integrated in a custom library. But it is also possible to solely use a vendor block within the project in which the vendor block has been created.
Restrictions: The following variables are not supported in the interface of vendor blocks:
→temporary variables (VAR_TEMP...END)
If you need temporary variables without storing behavior, create them within the implementation functionality.→external variables (VAR_EXTERNAL...END)
Moreover, →methods are not supported for implementing a vendor block.
Knowledge about C-code is essential so that you are able to create the actual content of the vendor blocks.
You might already know the ST-interfaces (= objects with the file extension .iecif ) by which you are able to integrate C-code and/or C++-code into the application. Please note that these ST-interfaces are deprecated and not suited for integration within a custom library.
For integration within a library, create the vendor blocks as described in this section.
Contents of this section: