Siemens SIMATIC NET SINAUT ST7 System Manual page 145

SINAUT ST7cc / ST7sc and the central controller are then both supplied with parallel data.
Both can receive the same data or data specifically intended for one or the other. The
transfer of commands, setpoints, parameters etc. to the stations in the telecontrol network is
possible from both ST7cc / ST7sc and from the S7-400.
The following figure shows such a configuration with two WAN attachments.
Figure 3-25
Note
The S7-400 is not required as a primary telecontrol master for ST7cc / ST7sc! Both devices
are supplied directly with data by the TIM 4 independent of each other.
The maximum number of TIM 4 modules that can be connected to a SINAUT ST7cc / ST7sc
control center system depends on the MPI interface card used in ST7cc / ST7sc.
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
SINAUT ST7cc / ST7sc control center system and SIMATIC S7-400 with TIM 4 on MPI
bus,
1 connection to WAN (1) over integrated modem,
1 connection to WAN (2) over external MDx modem
3.8 Standalone TIM 4 with an S7-400 or PC
Installation guide
145