Networking
5-3
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
5.2 Fundamentals
Station = Node
Declaration: All the stations you connect in a network are referred to as nodes in
the following.
Segment
A segment is a bus cable between two terminating resistors. A segment can
contain up to 32 nodes. Furthermore, a segment is limited by the permissible cable
length according to the transmission rate.
Transmission Rate
MPI/DP PROFIBUS DP
19.2 kbps 9.6 kbps 500 kbps
187.5 kbps (default) 19.2 kbps 1.5 Mbps
1.5 Mbps 45.45 kbps 3 Mbps
3 Mbps 93.75 kbps 6 Mbps
6 Mbps 187.5 kbps 12 Mbps
12 Mbps
Note
If you change the parameter assignment of the MPI/DP interface transmission
rate, the new transmission rate remains set even after memory reset, voltage
failure or removing/inserting the CPU.
Connectable Nodes
MPI PROFIBUS DP
Programming devices (PGs) Programming devices (PGs)
Operator panels (OPs), WinCC Operator panels (OPs)*
S7-400/M7-400 PROFIBUS-DP master:
S7-300/M7-300 PROFIBUS-DP slaves
* Not recommended in DP operation
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