The Multi-Point Interface – Siemens (MPI) is a proprietary interface of the programmable logic controller SIMATIC S7 of the company Siemens.
[1] It is used for connecting the stations programming (PC or personal computer), operator consoles, and other devices in the SIMATIC family.
The MPI is based on the standard EIA-485 (formerly RS-485) and works with a speed from 187.5 kBd to 12 MBd.
The network MPI must have resistance at the end of the line and it is generally included in the connector and activated by a simple switch.
Manufacturers using MPI technology offer a range of connections to a PC: MPI cards, PCMCIA cards, USB adapters or Ethernet.