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Figure 3-4
S7-300 with two WAN attachments
To achieve two connections to a WAN for an S7-300, in other words, classic WAN access
and IP-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 MD720.
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).
SINAUT ST7 station control system
System Manual, 09/2016, C79000-G8976-C178-10
SIMATIC S7-300 with TIM 3V-IE, 1 GPRS access via MD741-1 router
SIMATIC S7-300 with TIM 3V-IE Advanced with 2 connections to a WAN
3.1 Installing the TIM 3V-IE variants in an S7-300
Installation guide
91
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