Siemens Simatic S7-300 Technical Data Manual page 40

Communication
3.2 Communication services
Routing network nodes: MPI – DP - Ethernet
(e.g. 315-2 DP)
Number of routed connections
The CPUs with DP interface provide a different number of connections for the routing
function:
Table 3-5
CPU
31xC, CPU 31x
317-2 DP
31x-2 PN/DP
3-12
CPU 1
MPI DP
(master)
Subnet 2 (PROFIBUS)
Subnet 1 (MPI)
PG
Number of routing connections for DP CPUs
As of firmware version
2.0.0
2.1.0
2.2.0
CPU 2
(317-2 PN/DP)
MPI/DP PN
(active slave)
Subnet 3 (PROFInet)
CPU 3
(317-2 PN/DP)
PN
Number of connections for routing
Max. 4
Max. 8
Interface X1 configured as:
MPI: Max. 10
•
DP master Max. 24
•
DP slave (active): Max. 14
•
Interface X2 configured as:
PROFINET Max. 24
•
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05