Developer walk-through for the "fpga_global-variable" LabVIEW project available for download at https://learn-cf.ni.com/teach/riodevg... that covers this topic: "Use a global variable to communicate between two parallel process loops contained within different VIs under the same target."
See the "RIO Developer Essentials Guide for Academia" available at https://learn-cf.ni.com/teach/riodevg... for more video tutorials related to programming, architecting, and networking with LabVIEW and NI Academic RIO products.