MMS Communication Error in the online system
Are you able to ping the controller from OPC/AC800M connect server?
Is mms server is up and running in services.msc of Ac800M connect servers?
Is OPC server for Ac800M running with service account?
Is controller in smiley in OPC DA panel in AC800M Connect server?
Whats the controller system load?
Look at the network settings of controller and Control network should be fixed instead autonegotiation.
From the picture attached by you, the controller/hardware part of the Bleaching Project is reserved by somebody else!!
Since the application download is successful, i don't think any issue with controller communication. And also there wouldn't be any issue with firmware of the CI854/CI840 since it is running plant/plant is running well.
Considering the above, I suspect there could be some changes in the hardware of the controller which are not downloaded. Hence it shows complete controller section as error (red color).
Hope this helps you.
By the way, which plant it is APPM/ITC?