I don't know what happened to the answer I posted some 7 hours ago - the status is "Answered by Stefan Stromqvist 7 hrs ago" but there is 0 answers listed?
Looks like AKS ate the answer?
My answer was: there exists no OPC UA support in any version of CHMI nor 800xA as of writing. The upcoming 800xA 6.1.1 release is likely to address that lack. CHMI is typically slightly behind the 800xA release cycle.
Please speak with your regional ABB sales representative for more more details.