Fundamentals - Siemens SIMATIC S7-400 Hardware And Installation Manual

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
19.2 kbps
187.5 kbps (default)
1.5 Mbps
3 Mbps
6 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
Programming devices (PGs)
Operator panels (OPs), WinCC
S7-400/M7-400
S7-300/M7-300
* Not recommended in DP operation
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
www.gkbpx.com
9.6 kbps
19.2 kbps
45.45 kbps
93.75 kbps
187.5 kbps
MPI
Programming devices (PGs)
Operator panels (OPs)*
PROFIBUS-DP master:
PROFIBUS-DP slaves
Networking
PROFIBUS DP
500 kbps
1.5 Mbps
3 Mbps
6 Mbps
12 Mbps
PROFIBUS DP
5-3