Supplementary information
18.7 Communication services
CPU 410 Process Automation/CPU 410 SMART
312 System Manual, 05/2017, A5E31622160-AC
S7 communication offers communication functions through configured S7 connections. You
use STEP 7 to configure the connections.
S7 connections with an S7-400 are established when the connection data is downloaded.
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.
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