The Hierarchy Templates Root shows the various hierarchy templates that can be used to generate the structure of a plant. A hierarchy is made up of a set of two or more plant group types (formerly called hierarchy items) that are arranged in a tree structure. Examples of plant group types are plants, units, areas, and sites.
A hierarchy (also referred to as a work breakdown structure) is used as a template to create a plant structure and defines the available plant group items for a certain level of the tree. The hierarchy is essentially a set of rules that the plant structure must follow. For example, a plant structure using Hierarchy 1: Plant/Unit with the Allow P&ID Drawings option set on the Unit level allows you to create drawings only under a unit in that plant. Using this hierarchy, you can create a plant structure containing only one plant, then multiple units, and then multiple drawings under each unit.
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Drawings are not allowed in the top-most root item in a hierarchy. Therefore, Allow P&ID Drawings is not available at the root item level in a hierarchy.
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If you use a hierarchy in which Allow P&ID Drawings is not turned on for at least one level, the plant cannot be used in Smart P&ID, but can be used in other associated applications.
The plant structure hierarchy does not reference the hierarchy template after the plant structure is created. Smart Engineering Manager writes a copy of the hierarchy template to the plant database when the new plant is created. This reduces the dependency on the site for the hierarchy definition and allows you to modify the hierarchy template independent of whether any plant structures used it during their creation. You cannot modify a plant structure hierarchy after the plant structure has been created.
During plant structure creation, you can choose to use one of the default hierarchy templates or use a custom hierarchy that you have previously defined. You cannot modify the selected hierarchy template during plant structure creation.