Siemens SIMATIC PCS 7 System Manual page 244

Supplementary information
16.6 Communication services
S7 routing gateways: PROFINET IO - DP - PROFINET IO
The following figure shows the access from PROFINET IO to PROFIBUS to PROFINET IO.
CPU 1 is the router between subnet 1 and subnet 2; CPU 2 is the router between subnet 2
and subnet 3.
Figure 16-3
S7 routing: TeleService application example
The following figure shows an application example of the remote maintenance of an S7
station using a PG. The connection to other subnets is set up via modem.
The bottom of the figure shows how this can be configured in STEP 7.
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S7 routing gateways: PROFINET IO - DP - PROFINET IO
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB