Siemens SINAUT ST7 System Manual page 75

The following figure shows a different node station variant in which the TIM 4R-IE has a
redundant connection both to the master station and to the subsidiary stations. A variant of
this configuration would be to have a redundant connection only to the master station and to
have single transmission paths to the stations. Which two interfaces are redundant can be
freely selected by the user.
Figure 3-19
Standalone TIM 4R-IE as master station or node station
The following figure shows the use of the TIM 4R-IE in a standalone configuration; in other
words, without an S7-300 CPU. This configuration is found typically in a master station. It
could, however, also be used in a node station if its sole purpose is to interconnect the
various networks over the TIM and no local control or data acquisition is required.
In this configuration, you can see in detail how a station can be connected redundantly. The
example assumes that the main path is implemented as a dedicated line. The alternative
path is via the GPRS mobile phone service and the Internet.
The redundantly connected station has an Ethernet TIM (in this case a
TIM 3V-IE Advanced). To connect to the alternative path, the Ethernet interface is connected
to the GSM router SCALANCE M874 / MD741-1. The data is transferred via GPRS and the
Internet to the TIM in the master/node station using the substitute value. There, a fixed
connection to the Internet is required, for example over a DSL router. To provide security on
the path over GPRS/Internet, a SCALANCE S security module (for example S612) is
inserted between the TIM and DSL router in order to establish a VPN tunnel to the MD741-1.
A SCALANCE M874 router can be used instead of DSL router and SCALANCE S612 A.
SINAUT ST7 - Volume 1
System Manual, 11/2018, C79000-G8976-C178-12
Network structures, configuration examples, installation guidelines
SIMATIC S7-300 with TIM 4R-IE,
1 connection to WAN and 1 connection to Ethernet as redundant routes to the stations
and to the master station
3.3 Installation guidelines and compatible CPUs
75