I want to design a PID controller in LabVIEW for target FPGA Device. My FPGA Device is NI Digital Electronic FPGA board SO any hint will be helpful for me thanks.
it is already there for you:
http://zone.ni.com/reference/en-XX/help/371599L-01/lvfpga/fpga_floating_point_pid/
A few examples are available too, shipped with Labview FPGA