Hi Till,
there isn't an out of the box solution for applications that are going to use SAP Plant Connectivity. The connectivity framework in ABAP is located in package S_PCO. There you find all classes that could be used to build your own application. The test report RPCO_BS_INT_TEST is a sample application that we provided. With this test report you can see how you can implement for example queries that read tag values from an OPC server.
If you want to create a measurement document, you have to use the methods as shown in the test report in order to read the tag data and fill the tag data into your measurement documents. The test program can't be used for this purpose.
Best regards, Hans-Jürgen