Routing
10.5 Virtual interface for IP-based applications
Communication
Function Manual, 11/2019, A5E03735815-AH
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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 i
s 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
vated. If no IP suite is available, the IP address and the subnet mask are
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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