What communications port are you trying to use? Serial or Ethernet?
Serial requires that you have a RS232/485 converter and you flip the two middle dip switches down on the back of the unit. You can then setup the comms in control panel on the HMI.
Native Ethernet/IP driver only supports Logix's native tag address so it won't work with the 177B panels, you must have an MP panel and use an OPC server for SLC 5/05
Regards,
Michael