I've just installed on of these ProSoft devices in place of a 1761-NET-ENI. I got it to work on a MicroLogix 1500 by putting a 1,1 in the connection path using the MicroLogix driver.
The 1500 isn't really compatible with ignition so you need to check the don't browse processor under the advanced check box. In the designer you will have to manually enter the path for the tags like