Setting up an EK9500 as a Generic Device in RS Logix Studio 5000
Configure your Rockwell Hardware accordingly in RS Logix Studio 5000.
Then add a new Generic Module:

Enter a name for your Generic Module (EK9500_1 in the example). Enter the IP Address that was set on the EK9500. The Data type can be set to SINT, INT, DINT or any other optional data type as long as the total number of BYTES is equal to what is shown in the Device Manager EtherNet/IP™ Mapping. Enter the Assembly Instance Numbers (Input: 129, Output: 130, Config: 128). Click OK.

In RS Logix Studio 5000, click to go online and download the configuration to the controller. Communication between the Rockwell hardware and the EK9500 will start up automatically.