Hi,
One option is to use Omron's OPC Server:
http://oeiweb.omron.com/Products-Software-CXOPC.shtm
However, this may be a pricey option as discussed here:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=50650000000800000015740000&UCATEGORY_0=_9_&UCATEGORY_S=0
You may also want to talk to your NI Sales contact and inform him/her of your need.
Regards,
Khalid