Siemens SIMATIC ET 200AL System Manual page 907

The following figure shows the access from a PG via PROFINET to PROFIBUS. CPU 1 is
the S7 router between S7 subnet 1 and S7 subnet 2; CPU 2 is the S7 router between S7
subnet 2 and S7 subnet 3.
Figure 10-2
S7 routing for HMI connections
You have the option of setting up an S7 connection from an HMI to a CPU via different
subnets (PROFIBUS and PROFINET or Industrial Ethernet). In the following figure, CPU 1 is
the S7 router between S7 subnet 1 and S7 subnet 2.
Figure 10-3
Communication
Function Manual, 12/2017, A5E03735815-AF
S7 routing: PROFINET - PROFIBUS
S7 routing via HMI connections
Routing
10.1 S7 routing
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