MPI is a multipoint communication interface integrated into every SIMATIC programmable logic controller(SIMITIC S7/M7 and C7 systems).It can be used for straightforward networks.It can be used to connect multiple programming device and operator panels or SIMATIC programmable logic controlers.

MPI----Multi Point Interface is the programming device interface for SIMATIC S7.It allows simultaneous use of several programming devices,text displays and operator panels on one or more CPUs. The stations connected to MPI are interconnected via a bus system.