Siemens SINAUT ST7 System Manual page 127

S7-400 with two WAN attachments
The TIM 4 and two MD2, MD3 or MD4 SINAUT modems are mounted on a separate S7-300
rail. The TIM 4 is connected to the CPU over its MPI interface. The following figure shows
the configuration described.
Figure 3-19
Suitable modems or other transmission devices can be connected to the combined RS-
232/RS-485 interfaces of the TIM 4. 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.
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
SIMATIC S7-400 with TIM 4 on the MPI bus,
Two connections to WAN via external MDx (1) and MDx (2) modems
3.8 Standalone TIM 4 with an S7-400 or PC
Installation guide
127