Siemens Simatic S7-400 - Page 68

Communication
4.2 Communication services
S7-400 Automation System, CPU Specifications
4-16 Manual, 10/2006, 6ES7498-8AA04-8BA0
Routing: Example of a TeleService application
The following figure shows the example of an application for remote maintenance of an
S7 station using a PG. The connection to other subnets is here established via modem
connection.
The lower section of the figure shows how this can be configured in STEP 7.
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Figure 4-3 Routing: Example of a TeleService application