800xA and CHMI
To connect to to a AC800M controller the OPC server needs current "Domain files".
These files with the extension .cdo and .rrs are updated by CBM during download to the controller..cdo files will also change due to change in Controller type
I think the last download would have been performed by the 800xA system not CHMI.
That is why you face this issue.
I am not sure if you copy the domain files from 800xA and to CHMI would solve it.Perhaps you can try this option.
Prashanth's answer is correct. During download from CBM to AC800 critical files are generated/updated. When using CBM@800xA the files are stored in the Aspect Server accessible only to nodes within that same system.
There is no outspoken & straight out of the box support for what you are trying to accomplish.
Can you try to use DCOM or an OPC Tunneler (eg Matrikon) to relay the data over to the CHMI system?