How to connect 2 Nos. of CI854 of 2 different 800xA DCS with AC800M controller ?
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As mentioned before if you wish to connect ot Masters in a Profibus DP network best is to use a gateway (called DP-DP coupler). The gateway sepearates both networks and so makes available to map the information from one network to another. For each Master the gateway is seen as a slave device. the only company which I know sells this today is siemens.
Best way as mentioned, is to use IAC (Inter Application Communication) or the MMS read and write blocks to interchange information between AC800 Controllers.