Interface Configuration; Network Settings; Ip Address Assignment And Communications Path; Fast Ethernet With The Profinet And Gigabit Interface - Siemens S7-400 Equipment Manual

6.5

Interface configuration

6.5.1

Network settings

6.5.1.1

IP address assignment and communications path

Networking the gigabit interface and PROFINET interface
If the communications partner can be reached via the PROFINET interface and a router, you
should not network the gigabit interface with the subnet of the communications partner at
the same time. Depending on the communications service or physical network configuration
there may otherwise be conflicts.
Example: Gigabit interface networked but not connected
The gigabit interface is, for example, networked with a subnet A, however not physically
connected to subnet A.
The PROFINET interface is networked with a subnet B and communications partner X in
subnet A can be reached via a router.
There is now communication with communications partner A. During operation, based on the
configuration the CP selects the gigabit interface as the direct possible communications path
to communications partner X. Because it is not connected the gigabit interface is actually not
available and communication cannot be established.
Separating the PROFINET and the gigabit interface
It is advisable to separate the PROFINET interface and gigabit interface physically. If the two
interfaces are not separated, problems can occur when establishing an S7 connection using
the ISO protocol under the following conditions:
• If connections to the same partner address were configured via different interfaces.
• if an S7 connection configured at one end needs to be established.
6.5.1.2

Fast Ethernet with the PROFINET and gigabit interface

The common transmission characteristics of the two interfaces are described below. For
information on the transmission speed 1 Gbps of the gigabit interface, see section
Transmission speed of the gigabit interface (Page 61).
The configuration of the network settings "Transmission medium / duplex" is made for both
interfaces in the properties of the port of the relevant interface in the "Port parameters"
parameter group:
• Row "X1P1": Port properties of the gigabit interface
• Row "X2P1/2/3/4": Properties of port 1, 2, 3 or 4 of the PROFINET interface
CP 443-1 Advanced
Equipment Manual, 03/2023, C79000-G8976-C256-07
Configuration and operation
6.5 Interface configuration
59