|From PLCOpen.org presentation of February 2014|
One event was the announcement today in Control Engineering - Europe entitled OPC-UA client function blocks for IEC 61131-3. In that announcement was the following excerpt "...adding the OPC UA client functionality in the controller by defining a set of Function Blocks for IEC 61131-3. This specification has just been released, making the controller an intelligent part in the IT communication."
The other announcement is even more significant in my book. It's the release of the a new ControlLogix OPC-UA module made by OLDI. I missed the Rockwell webinar about it yesterday and the information on OLDI's site is sparse, but it obviously sits on the CLX backplane so would seem to have access to at least a single controller's tags and maybe even more.
The latter release will likely pressure other PLC manufacturers to do the same, and then I think the snowball really begins.