The CAN API from NI-CAN driver can program your CANopen device but unfortunately National Instrument does not have any examples made for CAnopen devices. I googled this topic and found out that there are companies offer LabVIEW code libraries for CANopen device, I will attach the link to some of them below:
http://www.cd-systems.com/Can/pc-sw/CANopen/LvCano2_0/Lv-cano-Gen.htm
http://www.can-cia.org/products/pg2004/html/index-1031.htm