Siemens SIMATIC Box PC 840 Manual page 53

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Connecting
Via the PROFIBUS/MPI port, you can connect your PC to
S MPI networks (S7-200, S7-300, and S7-400) or
S PROFIBUS DP networks (DP components).
MPI/PROFIBUS-DP Network
Up to 32 devices (PC, programming device, or programmable controller) can be
connected to the PROFIBUS/MPI interface to form a network segment. The physi-
cal connection to the network is via a floating RS485 interface which is a compo-
nent of the PC basic module.
Several network segments can be connected via repeaters. The complete network
can comprise up to 127 stations. Data transmission rates from 9.6 Kbps to
12 Mbps are possible.
SIMATIC Box PC 840 Manual
A5E00085984-04
Setting Up and Operating the SIMATIC Box PC 840
3-21

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