Hi,
the protocol can be choosen by some parameters when creating a new online connection settings in Automation Studio.
Unfortunately I’m not able to make an example screenshot, because I’m not near my Automation Studio PC before monday.
But could you please check if SDM is active in your PLC? If active, you can open SDM in browser by entering the URL, /sdm, for example http://192.168.5.100/sdm
If SDM is available, please navigate to System → General, and tell us the Version at “Software Versions - Automation Runtime”.
This version helps us to get at least an idea, if ANSL or INA or both online protocols should be available.
Additionaly, in SDM under Hardware, you can check the hardware tree of the PLC (configured hardware versus found hardware at boot).
Best regards!