Data transmition between AC800M
it is possible to data transmition from one PM861 controller to another PM866 using another communication protocol. we had a communication problem with the control network to avoid this problem when using the PM861 controller with a gateway with another controller.
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Control network is designed for safe communication between AC800M CPUs using IAC communication variables.
Consider using NE870 router to connect 2 separate Control networks.
If you have no other choice you can connect two AC800M controllers through Profibus DP/DP coupler or through Profinet coupler.
In theory it is possible to use also serial Modbus old school way.
CI868 to CI868 IEC61850 goose communication is an another very good option to exchange data between two AC800M controllers.
It's speed also will be starts from 10ms, you can use dedicated IEC61850 network for this communication.
Card redundancy is not applicable for CI868, application redundancy code required for handling redundancy.