TrendStorageReader (FB)

FUNCTION_BLOCK TrendStorageReader EXTENDS TrendFbAbstractTrendStorageReader IMPLEMENTS ITrendStorageAccessReadOperator2

This function block can be used from the application code to access the trend storage. For each trend recording a separate FB instance must be instantiated! This FB holds a permanent connection to the corresponding trend database file for a better performance. Thus it is not possible to switch this instance to another trend instance.

Methods:

AddTrendStorageWriterListener

ContinueReading

GetMinMaxTimestamps

Initialize

Read

RemoveTrendStorageWriterListener

CurveFillingAlphaRead

CurveFillingColorRead

CurveFillingTypeRead

CurveTypeRead

DoContinueReading

GradientAngleRead

GradientBrightnessRead

GradientCenterXRead

GradientCenterYRead

GradientColor1Read

GradientColor2Read

GradientColorBrightnessRead

GradientTranspColor1Read

GradientTranspColor2Read

GradientTypeRead

GradientUseTwoColorsRead

LineStyleRead

LineWidthRead

Structure: