Hi Metronet,
VI Logger doesn't support acquiring data from multiple DAQ cards.
VI Logger was a free software tool that came with new DAQ cards up until the end of March. To get customers up and running and acquiring data in the quickest possible time.
VI Logger however is not LabVIEW, and as such cannot use more than 1 DAQ card at any one time. If you want to acquire from multiple cards then you will need to program in LabVIEW, CVI, Visual Basic or Visual C.
I am sorry that I have to inform you of this, but NI has no plans to release VI Logger with support for multiple DAQ cards.
Regards
James
Applications Engineer
NI UK