In RSLinx Click on Communications > Configure drivers > Highlight the ethernet driver that is configured, then Click Configure. You should then see a list of stations and a list of host names. In the first blank space in the host name column enter the IP address.(like this for instance) 192.168.100.20 or whatever the SLC500 address is. Next, on the next line in the host name column, enter the name of the computer that has the ethernet adapter in it, or, if you were able to manually able to configure the TCP/IP adapter like I posted earlier, enter that IP address in the host name column. Be sure that the first three groups are the same in both IP addresses, but not the last group. If you have the SLC500 IP address then the computer ethernet IP address should be the same, except for that last group. Don't use 0 or 255 but somewhere in-between.
Either IP address or computer name can go in the HOST NAME column.
Just remember, all the different devices, (computer, PLC's etc.) have to be on that HOST NAME list.