If you are using the FieldPoint VI's (Open, Create Tag, Read, Write, Advise), you do not have the ability to change the range of a channel. If you have a FP-1000 or FP-1001, you can use the Optomux commands as described in the FP-1000/1001 Programmers Reference Manual (FieldPoint Optomux VI's are available at ftp://ftp.ni.com/support/fieldpoint/LVFPOpto/ ).
Alternatively, if you have an ethernet network module and LabVIEW 6i or later, you can use the ethernet configuration VI's that ship with FieldPoint Explorer 3.0.1.
Regards,
Aaron
LabVIEW Champion, CLA, CPI