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If a SINAUT modem of the type MD2, MD3 or MD4 is used, this can be installed on a
separate S7-300 rail or on a 35 mm DIN rail (an adapter is available). To save space, it can
also be installed in a free slot of racks 0 to 3. This modem is connected over the RS-232 port
of the TIM using a standard connecting cable, type 6NH7701-xxx.
NOTICE
Since the SINAUT-Modems MD2, MD3 and MD4 do not have an S7-300 backplane bus, an
S7-300 SM, FM or CP module that communicates with the CPU over this backplane bus
must not be inserted to the right of the modem!
Note
In all of the sample configurations of the S7-300, it is assumed that a 24 V power supply is
available for the CPU, the TIMs and the other modules.
S7-300 with access to a classic WAN
To implement classic WAN access for an S7-300, you can use either a TIM 3V-IE or a
TIM 3V-IE Advanced. The following figure shows such a configuration.
Figure 3-1
Other modems with an RS-232 interface can also be used, for example wireless devices or
the SINAUT GSM modem MD720-3.
S7-300 with access to Ethernet-based WAN
To implement Ethernet-based WAN access for an S7-300, you can use either a TIM 3V-IE or
a TIM 3V-IE Advanced.
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
SIMATIC S7-300 with TIM 3V-IE with 1 connection to classic WAN over an external MDx
modem
3.4 Installing the TIM 3V-IE variants in an S7-300
Installation guide
121
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