Routing
11.5 Virtual interface for IP-based applications
Communication
Function Manual, 05/2021, A5E03735815-AJ
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Once the IP address is entered, it is shown in the properties dialog of the OPC UA server in the
list of server addresses. These settings provide the CPU with the new virtual interface W1 via
which CPU services like the OPC UA server can be accessed via a communication module. The
corresponding connections and S7 communication (e.g. HMI and BSEND, BRCV) are made via
this interface. The OPC UA server does not allow selection of a specific interface (selection via
an IP address), either all or none are possible.
Note
The IP address of the virtual interface is not listed as W1 in the device display under the
currently displayed local interfaces (Xn) but is available under "Addresses" in the "Settings"
section. The virtual interface is also visible when no CP is plugged or when the virtual
interface is not activated. If no IP suite is available, the IP address and the subnet mask are
0.0.0.0.
If you change the configured and loaded IP address parameters of the virtual interface via
display, T_CONFIG instruction or online, the loaded configuration is active again after the CPU
restarts.
Configuration changes on the CP
A change of the assigned communication module may have an effect on the configuration of
the virtual interface:
•
In the properties of the CPU:
–
Assignment of a different CP: The configuration is used for the new CP.
–
Deselect the assigned CP: The virtual interface W1 is deactivated and the configuration
is lost.
When a CP is assigned again, the configuration must be performed again.
•
On the device:
–
Moving the CP: If the CP is only moved to another slot of the device, the configuration
continues to be valid.
–
Removing the CP: If the CP is deleted or moved to another device, the configuration is
retained. In the drop-down list of the CPU, the CP is displayed as missing and compiling
the configuration indicates an error. The missing CP can be deselected or assigned to
another CP.
Display in the diagnostics and the system constants
The virtual interface W1 is displayed in the diagnostics view under "Online & Diagnostics". The
hardware ID of the virtual interface is displayed in the system constants of the CPU
properties.
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