Communication mechanisms
2.2 Communications options
Configuration - DNP3
26 Configuration Manual, 11/2018, C79000-G8976-C508-01
● DNS server address(es)
You require the DNS server address if you address the master using a name that can be
resolved by DNS.
● Partner number
Stations that communicate with the master require the partner number of the master in
order to assign the data points to be transferred.
With S7-1200 CPs that can only function as stations, the partner number of the master is
assigned by the system.
The two devices of a redundant master have an identical station address.
They only require different IP addresses or host names.
Configurations with connections over the Internet: VPN connections
For connections running via the Internet, dynamic IP addresses can be used.
To allow communication in both directions and to ensure that the data is protected during
transfer, a connection with a VPN tunnel is necessary. For this the security modules of the
SCALANCE S or SCALANCE M series are available.
Remember the following points when configuring:
● You configure the IP address of the master station on the master.
● When configuring the interface of the station module, you configure the IP address of the
router.
● You perform the VPN configuration with SCALANCE S/M both for the station and for the
master station in STEP 7.
Communications options
Communication paths
The following communication channels are possible:
● Connections between master and station
● Redundant connections
If two subscribers can be reached via different networks, you can create a maximum of
two connections between the subscribers to establish path redundancy.
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