Rockwell-automation FactoryTalk Historian SE ProcessBook 3.2 User Guid Manual de usuario descargar pdf (Pagina 261)

7 ● Data Streams

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 UOM - allows you to select a unit of measure for a given

attribute.

6. [Optional] Click Add Element Name to add the element name of the

current context to the symbol. Select the Use Full Path check box to

show the full path of the current context instead of just the element

name.

7. Click OK to add the selected attribute(s) to your dynamic symbol.

Context Path

A context path relates an AF Attribute to a parent element within an AF

database. An AF Attribute added as a data stream to a dynamic symbol can

point to different underlying FactoryTalk Historian points, depending on

its context path.

Context paths can be used to drive displays created in FactoryTalk

Historian ProcessBook and other FactoryTalk Historian client applications.

Displays that utilize context paths in this manner are referred to as

element-relative because the data displayed for the attribute at any time

depends on the context path that links the attribute to a parent element.

Context paths are used most frequently to change the data displayed by a

symbol based on user selection. For example, based on the selection of AF

Elements or attributes that represent assets in a plant, a display may present

data from parallel assets in a single plant or in different locations.

For example, assume Tanks 1-5 in a plant are all described by the same

measurement attributes of temperature and pressure. Each tank is

represented as an element in the AF database with corresponding

temperature and pressure attributes. A display that references the

temperature attribute could display data for each tank in turn by allowing

the user to specify the context path to any particular tank element.

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Rockwell-automation FactoryTalk Historian SE ProcessBook 3.2 User Guid Manual de usuario Pagina 261