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S7-300 with two WAN attachments
To achieve two connections to a WAN for an S7-300, in other words, classic WAN access
and Ethernet-based access, a TIM 3V-IE Advanced must be used. A TIM 3V-IE is not
suitable in this case, because only one of its two interfaces can be used. The following figure
shows such a configuration.
Figure 3-5
Instead of the MDx SINAUT modem, 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 maximum configuration
A maximum of one (standard) TIM 3V-IE can be inserted in an S7-300. Only one of the two
interfaces (RS-232, RJ-45) can then be used for SINAUT data transmission.
If a TIM 3V-IE Advanced is used, the maximum number that can be inserted in an S7-300
depends on the resources provided by the CPU. Two connection resources per TIM are
required on the CPU.
Apart from the connection resources, the available work memory on the CPU must also be
taken into consideration. The more TIMs installed and the more stations connected and the
more objects processed per station, the greater the memory requirements of the telecontrol-
specific user program on the CPU. This program is put together with blocks from the
SINAUT TD7 software package. The SINAUT program can run entirely on the CPU
(TD7onCPU), with the TIM 3V-IE variants also on the TIM (TD7onTIM).
ST7cc / ST7sc with the TIM 3V-IE Advanced
A TIM 3V-IE Advanced can be used as a master TIM for the PC of the ST7cc or ST7sc
control center. In this case, the TIM 3V-IE Advanced requires an S7-300 CPU because it
cannot work without a CPU.
In the two cases illustrated below, the maximum number of TIMs in the rack is not limited by
the connection resources of the CPU because they are not required. You should not insert
more than 8 TIMs. Less TIMs per CPU are preferable to achieve better availability. The
greatest availability is achieved when there is only one (1) TIM in the rack connected to the
CPU over the backplane bus.
There are two ways of connecting the CPU/TIM module combination to the PC as illustrated
by the following two configurations.
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
SIMATIC S7-300 with TIM 3V-IE Advanced with 2 connections to a WAN
3.4 Installing the TIM 3V-IE variants in an S7-300
Installation guide
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