Siemens SIMATIC PC 670 Equipment Manual page 57

Release 04/02
MPI/PROFIBUS-DP network
Up to 32 devices (PCs, programming units or PLCs) can be connected to the
MPI/DP interface to form a network segment. The physical connection to the
MPI/PROFIBUS-DP network is via an isolated RS485 interface, which is an
integral part of the PC's basic board.
Several MPI/PROFIBUS-DP network segments can be connected via repeaters.
The complete MPI/PROFIBUS-DP network can consist of up to 127 nodes. Data
transmission rates of 9.6 Kbits to 12 Mbit/s are possible using the PROFIBUS-DP
MPI network.
Panel PC 670 Computing Unit, Equipment Manual
Connecting and Switching on the Computing Unit
3-23