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S7-300 with two WAN attachments
If an S7-300 require two connections to classic WAN networks, a TIM 4 can be installed. The
modem integrated in the TIM provides the first connection to a WAN. The second WAN can
be connected over the RS-232/RS-485 port of the TIM 4, for example over a SINAUT MD
modem MD for dedicated line or telephone network. The following figure shows such a
configuration.
Figure 3-18
The following figure shows a configuration in which the modem is installed at the extreme
right in rack 0. To make the situation clearer, TIM and modem are installed next to each
other. The TIM is connected to the module on the left using a bus module connector. There
is no bus module connector between the TIM and modem.
Figure 3-19
In both the examples above, instead of a TIM 4, the TIM 4R can be used with its two
combined RS-232/RS-485 ports for connection of the required external modems or other
transmission equipment instead of an integrated modem.
Instead of the MDx SINAUT modem, other modems with an RS-232 or RS-485 interface can
also be used, for example wireless devices or the SINAUT GSM modem MD720-3.
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
SIMATIC S7-300 with TIM 4,
1 connection to WAN (1) over integrated modem,
1 connection to WAN (2) over external MDx modem (mounted on a separate rail)
SIMATIC S7-300 with TIM 4,
1 connection to WAN (1) over integrated modem,
1 connection to WAN (2) over external MDx modem (installed in rack 0)
3.7 Installation of the TIM 3 / TIM 4 as CP in an S7-300
Installation guide
139
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