Hi Joey
You can daisy chain up to eight SCXI-1001 chassis with a E-Series board.
When using multiple chassis you have to know how fast you can scan the channels:
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/b2cbc9df113e20cb86256b7800649ab9?OpenDocument
Another interesting link: http://zone.ni.com/devzone/conceptd.nsf/webmain/9B1223AD8C1E86EC86256B6F00596064?opendocument
Hope this helps
Luca
Regards,
Luca