Hi,
I have to deal with IRIG B protocol on a compat RIO. It's a 9074 and the IRIG signal is wired on a 9402. I searched on the NI website and found 2 libraries that seems to decode IRIG :
IRIG-B Implementation in LabVIEW FPGA
FPGA Timekeeper
I played with the first one and succeed to get day of...