Rockwell-automation FactoryTalk Historian SE ProcessBook 3.2 User Guid Manual de usuario Pagina 268

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FactoryTalk Historian ProcessBook User Guide
250
These functions are fully described in the Performance Equations
chapter of the FactoryTalk Historian Server Applications User
Guide.
FactoryTalk Historian Expression Data Sets
FactoryTalk Historian Expression Data Sets enable you to create your
own function or expression in FactoryTalk Historian Performance
Equation syntax. These expressions can include tag variables with
mathematical and logical operations as described in the Performance
Equations chapter of the FactoryTalk Historian Server Applications
User Guide.
Create a PI Calculation Data Set
To create a calculation data set:
1. Click Tools > Data Sets. The Data Sets (page 246) dialog box
appears.
You can also create a PI calculation data set by clicking the drop-down
arrow next to the Tag Search button in the Define dynamic symbol dialog
box boxes. By accessing the FactoryTalk Historian calculation Data dialog box
this way, you have the additional option of selecting a previously created PI
Calculation Data set, as well as the ability to create a new one as outlined
below.
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