Before editing the diagram to replace the existing blocks with a corresponding DLL, it is a good idea to verify that the DLL operates correctly.
For example, in following diagram, a DLL is created from the AC Motor (dq) compound block. To verify that the DLL operates correctly, the inputs to the compound block are fed into the DLL. A second plot block, with the same properties as the original plot is placed in the diagram. If both plots register the same results when you simulate the diagram, then the DLL is correct.