Check to make sure you have the latest updates for RSLinx. If you see a device, but not the correct Icon, then you need to revise Linx. I don't remember off hand the name of the files, but they are not hard to find.
Also, make sure to set up your driver in RSLinx. If you haven't typed the IP addresses into the table for your driver, you do not have RSLinx correctly set up. (this is for the Ethernet and TCP/IP drivers)
Hope this helps.