Can we communicate Compact HMI 800 Scada with Ac800m controllers using CI873
CI873 is module to connect ac 800m over ethernetip or over devicenet to other devices.
To communicate or display values from ac 800m controller to compact hmi 800 you don't need ci873, you can fetch values to hmi via OPC.
you can check more details on ci873 @ http://www.abb.com/product/us/9aac170435.aspx
Hope that helps.