Is it possible to transfer datatypes with forward and backward connection using IAC_MMS?
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Yes it's possible. Reading the User Manual: AC 800M 5.1 Feature Pack Communication Protocols ID:3BSE035982-511 on page 56 it says:
For communication variables with structured data types, bidirectional communication is also possible if the
reverse attribute is set on the required components of the data type. The components with reverse attribute communicate in the backward direction, while others communicate in forward direction. For this type of communication, only one server and one client can be connected (1:1).
So the answer is: Yes it's possible, since the Datatypes you ask for is in the cathegory described.