Hi @Mathias ,
I also think you should post this question to the Siemens forum, or a forum that set topic/zone for Siemens PLC. The tag(sql-server-general) indicates that this is a forum focused on SQL Server technical issues.
Please see if this similar case helps. (The forum may be suitable)
https://stackoverflow.com/questions/62403650/connecting-an-plc-siemens-s7-1500-to-an-sql-server-database