BSAP/Modbus
I have pushed my lists to a new Custom Function block and let the Allen Bradley PLC speak Modbus. For some of the MicroLogix (LRP), this is a pre-defined protocol but with ControlLogix, you will need to purchase a bridge. I would suggest a external Prosoft module. They have modules for Ethernet and serial and multi-port/protocol functionality.
The Red Lion is an option as well but their interface is terribly cumbersome and difficult to troubleshoot. I have gotten the BSAP communication to work but ended up using the Modbus gateway instead.