There is an inconsistency in what you are saying and the screenshot.
The screenshot showed an EN2T (10.26.240.183). What slot is it? or list out the details of the whole rack.
Assuming it's a ControlLogix system L83 and an ENxT card on the 3rd slot(192.168.1.40) connected to a compactLogix machine (ex. 192.168.1.41).
I'd strongly suggest to set it up with RSLINX first. I was able to set it up in the past.
You can try this:
IP address: 10.26.240.183 or 192.168.1.40
ProcessorSlot: Slot# of EN2T
RoutePath: 1,3,2,192.168.1.41
[ Go through backplane '1' then out of slot '3' and use ethernet network '2' to compact Logix machine at 192.168.1.41]