Siemens SIMATIC S7-300 CPU Data: CPU 315-T-2 DP - Page 40

Communication with the S7-300
5.3 Communication services on the MPI/DP interface (X1)
Requirements for routing
• The station modules are "capable of routing" (CPUs or CPs).
• The network configuration does not exceed project limits.
• The modules have loaded the configuration data containing the latest "knowledge" of the
entire network configuration of the project.
Reason: All modules participating in the network transition must receive the routing
information defining the paths to other subnets.
• In your network configuration, the PG/PC you want to use to establish a connection via
network node must be assigned to the network it is physically connected to.
Example of an application: TeleService
The figure below shows the example of an application for remote maintenance of an S7
station using a PG. The connection to other subnets is here established via modem
connection.
The lower section of the figure shows how to configure this in
STEP 7 .
&38[7'3
&38[7'3
3*
3*
'3PDVWHU
'3PDVWHU
6XEQHW
352),%86'3'5,9(
5HDOFRQILJXUDWLRQ
&RQILJXULQJLQ67(3
7HOH6HUYLFH
DGDSWHU
6XEQHW
352),%86'3'5,9(
6XEQHWHJ03,
0RGHP0RGHP
6XEQHWHJ03,
'ULYH 'ULYH
'ULYH 'ULYH
Figure 5-3 Routing - example of TeleService application
S7-300 CPU Data: CPU 315T-2 DP
5-12 Manual, 12/2005, A5E00427933-02