Probably Fanuc Robotics RJ3?
We have two of them (Fanuc robot RIO adapters) talking to SLCs via the 1746-SN, so I suspect that you should be able to follow a similar path to add the Fanuc RIO adapter as C-Logix I/O as you would do with other generic adapters...I've never used RIO with Logix, so I would have to let others fill in the details...