Doesn't seem to effect anything but i have a new ecomex in a BX-DM1E-36AR3 and noticed Saturday that i see 2 versions of this plc in the netedit list. The builtin ethernet port is configured to 192.168.0.20 and the ecom is 172.26.56.106 (which is behind our network so we can remote in). I was changing out a dmio-m module and giving it the same ip address as the old 1 when i noticed 2 of the PLC's in the list. I took out the ecom wire and re scanned and then there was only 1, put back in and there was 2.
Doesn't seem to matter as far as operation only that you do a double take when you see 2 PLC's in the netedit list.