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Standalone TIM 4R-IE as control center 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 control center. 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 wireless 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 GPRS router MD740-1. The data is transferred via GPRS and the Internet to the TIM
in the control center/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 with which the MD740-1 can establish a VPN tunnel.
Figure 3-10
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
TIM 4R-IE in a control center or node station, redundant connection to subsidiary station;
one path as dedicated line, the second over GPRS and Internet
3.5 Installing the TIM 4R-IE in an S7-300
Master station
or
Node station
GPRS
Station
Installation guide
Internet
129
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