Hi.
I have PLC with "white" static IP-address and URL (something like as "myplc.mydomain.com")

I want to login in this PLC from CODESYS IDE.

When I use IP-address - all works fine (see screenshot).

But if I use instead IP "myplc.mydomain.com" (just in case: my real URL is different and I'm sure it works because I can open web-visu of PLC with it) - I got timeout error from Gateway.

Is this possible to login PLC using URL?

From your screenshot, if you click Device > Manage Favourite Devices > Add, you will get a blue tip about using "dns:" to prefix your dns address.

you might be able to just type "dns:myplc.mydomain.com" into the Device box, but you won't get the helpful blue tip about the syntax.