MPI protocol is an internal protocol of Siemens. MPI is a seven-layer network structure model based on OSI (Open Systems Interconnection), which conforms to the PROFIBUS standard defined by European standard EN50 170 and is a token-based network communication protocol.
MPI communication is the interface of SIMATICS7 multipoint communication, and it is a network suitable for communication between a few sites, which is mostly used to connect the upper computer and a few PLCs for short-distance communication.
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MPI communication is a simple and economical communication mode when the communication rate is not high and the communication data is not large. . The communication rate of MPI network is 19.2Kbps~ 12Mbps, and it can connect 32 nodes at most, and the maximum communication distance is 50m, but the length can be extended through repeaters.
S7-200 and S7-200smart support MPI slave stations, S7- 1200 does not support MPI protocol, S7- 1500 does not support MPI protocol, and S7-300,400 supports MPI protocol. In fact, from the product upgrading, we can see that MPI protocol is being eliminated, and profinet is becoming more and more mainstream.
Baidu encyclopedia -MPI