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The last time I looked at it, eDNA had an ODBC (SQL) type of connector to it, and that was about it.
If so, then you could use the ODBC Driver from Geo SCADA Export to retrieve data from eDNA.
Otherwise if the EcoStruxure Web Service stuff is now available out of eDNA then you could use that (if it's available, then it's probably the best option). Configuration side in GeoSCADA Expert should be quite straight forward, how to configure this in eDNA is a different story... and you might have to beat it to death with its own shoe.