Extensions come in different types to match the data type of the component and the collection method desired. You can add history extensions by dragging them onto your property sheet or into your nav side bar pane from the history palette (see Figure 168). Refer to To add an extension to a component property sheet view: for steps for adding an extension.
Extension types include:
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BooleanChangeOfValue
used to collect boolean values whenever those values change.
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BooleanInterval
used to collect boolean values at specified time intervals.
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NumericChangeOfValue
used to collect numeric values whenever those values change.
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NumericInterval
used to collect numeric values at specified time intervals.
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EnumChangeOfValue
used to collect integer values (enumerations) whenever those values change.
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EnumInterval
used to collect integer values (enumerations) at specified time intervals.
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StringChangeOfValue
used to collect a string of characters whenever the characters change.
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StringInterval
used to collect a string of characters at specified time intervals.
For more details about extension types, refer to Types of history extensions.