Supplementary information
15.6 Communication services
CPU 410-5H Process Automation
246 System Manual, 09/2014, A5E31622160-AB
You can access your S7 stations beyond subnet boundaries using the programming device /
PC. You can use them for the following actions:
● Downloading user programs
● Downloading a hardware configurations
● Performing test and diagnostic functions
● 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 connected to the network gateway must receive routing information
which defines the paths to other subnets.
● In your network configuration, the PG/PC you want to use to set up a connection via
gateway must be assigned to the network to which it is physically connected.
● The CPU must be configured as the master.
S7 routing gateways: PN - DP
Gateways between subnets are routed in a SIMATIC station that is equipped with interfaces
to the respective subnets. The following figure shows CPU 1 (DP master) acting as router for
subnets 1 and 2.
Figure 15-2 S7 routing
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