You can extend interfaces just like function blocks. The interface is then also given the interface methods and interface properties of the basic interface in addition to its own.
Creation of an interface that extends another interface.
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Select the object “Application” in the device tree.
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Select the command “Project Add Object Interface”.
The dialog box “Add Interface” opens.
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Enter a name for the new interface.
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Activate the option “Extended” and click on the button
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The input assistant opens.
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From the category “Interfaces”, select the interface that is to be extended by the new interface.