Using Multiple FPGA VI References for the Same Target (FPGA Interface)
If you want to open references to different FPGA VIs or bitfiles on one target, open only one reference at a time, and close the reference before opening another.
You can have more than one FPGA VI reference simultaneously open on a target, as long as all the references correspond to the same FPGA VI or bitfile on the same target. You can take advantage of this if you want to structure an application so that different parts of the host VI communicate with certain parts of the FPGA VI. The host VI accesses certain resources from the FPGA. The resources can include controls and indicators, logical interrupts, and DMA channels. The best way to partition the host VI is to access one of the FPGA resources using one FPGA VI reference. The only type of access that you can always safely make using multiple FPGA VI references is reading of controls and indicators.