Adriana,
Assuming that you are using the Polymorphic version of the FieldPoint VIs, it is likely that the wrong version of the VI was selected. You should be able to right click on the FP Read.vi and choose Select Type. Under Select Type, you should choose either the FP Read (Float)or FP Read (Float Array) if you are using FieldPoint Refnums. If you are using the FieldPoint IO Point tag, you should choose either FP Read (Float -IO) or FP Read (Float Array -IO). For either of the above, you should select Float if you are reading a single channel and Float Array if you are reading multiple channels on the module.
Regards,
Aaron
					
				
			
			
				
	LabVIEW Champion, CLA, CPI