Siemens SIMATIC S7-1500 Function Manual page 305

Routing
10.5 Virtual interface for IP-based applications
Compared to conventional interfaces, the virtual interface has the following restrictions:
● No access to the web server over the virtual interface.
● Online backup is not possible via a connected programming device with the TIA Portal.
● If the CPU and communication partners are connected via the virtual interface, they
cannot exchange data via LLDP (Link Layer Discovery Protocol).
● The S7 routing service does not use the virtual interface W1.
Requirement
For a CPU service to be accessible via the Ethernet interface of a CP, the following
requirements must be fulfilled:
● S7-1500 CPU firmware V2.8 or higher
● CP 1543-1 firmware V2.2 or higher
R/H CPUs do not support this function because R/H CPUs do not support CPs.
Configuration of the virtual interface W1
In the properties of an S7-1500 CPU as of firmware V2.8, you can assign a plugged
communication module to the virtual interface W1 under "Advanced Configuration > Access
to PLC via communication module". You can then use this for external access to the CPU. If
no CPs are plugged in or the plugged CPs do not support access to the CPU, the selection
is empty.
Figure 10-15 Selecting the CP in the CPU properties
After selecting the CP, the specifications and parameters for the virtual interface are
displayed. Here, you can edit the settings for the IP protocol and the PROFINET parameters.
● The IP subnet is freely selectable, just like with the CP. The IP subnet is entered via the
subnet mask and IP address of the virtual interface.
● When entering the IP subnet for the virtual interface, note that you are not using the same
IP subnet as for the local interfaces of the CPU.
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Function Manual, 11/2019, A5E03735815-AH
Communication