The CP50M1 communications module provides two PROFIBUS DP/MPI interfaces and an 8 MB interprocessor memory for inter-CPU communication. The interfaces can be used as PROFIBUS DP master, slave, as master and slave simultaneously or as MPI node.
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SIMATIC TDC Communication module CP 50M1 with 8 MB buffer module up to 1 MPI interface, up to 2 PROFIBUS DP Interfaces