yes it is a possibility. Depending on how many I/O cards you have installed we really can't tell you exactly where the I/O will show up. Keep in mind you should be looking at EXTERNAL INPUTS/OUTPUTS to confirm if your commuication is working ok. When you view the external in/outs they display alot of i/o at once, not just 8 like the universal in/outs.
Also, do you have a end of line resistor on your d-net network? Are the baud rates matched up? I believe by default, Compact Logix D-net scanner is setup for 125kb.
Let us know if you see the i/o showing up on the externals.
RoboGuru