When SDx receives the schema, the functionality expands out all the realizes relationships and adds the items into the tag type hierarchy.
In the following example, the tag type hierarchy shows how the class definitions are associated to the tag types. The Process Equipment class definition is related to the Fluid Transfer Equipment enum using an interface definition, which realizes the Blower and Pump tag types. The Pump tag type realizes the Centrifugal pump, Gear pump, and Rotary pump tag types.
Tag Type |
Tag Class |
Tag Type 1 |
Tag Type 2 |
Tag Type 3 |
Tag Type 4 |
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Tag Item |
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Instrument(*) |
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Equipment(*) |
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HVAC Equipment(*) |
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Process Equipment(*) |
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Fluid Transfer Equipment |
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Blower |
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Pump |
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Centrifugal pump |
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Gear pump |
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Rotary pump |
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The items marked with (*) next to them can have either an interface (with properties) or a class definition associated with them.
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All class definitions realize at least one interface definition. However, some class definitions that are associated to an interface definition are still displayed in the tag type hierarchy.