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Read Tag History

Version:
Last Modified: November 14, 2019

Returns the historical values from a single tag. The data type of the tag must match the polymorphic instance.

tag in

Reference to a tag on the server.

Use Open Tag or Query Tags to obtain this reference.

window

Time range you specify to read historical tag values.

The default is set to read all values decimated to 1,000.

error in

Error conditions that occur before this VI runs. The VI responds to this input according to standard error behavior.

next window

Time range you specify to read historical tag values.

The default is set to read all values decimated to 1,000.

tag out

Reference to a specific tag on SystemLink Server or SystemLink Cloud.

Use Open Tag or Query Tags to obtain this reference.

values

Data values of the tag history. Wire this output to a constant or control with the same data type as the polymorphic instance.

time stamps

Dates and times the server obtained the most recent historical data values.

error out

Error information. This VI produces this output according to standard error behavior.

end of data?

Boolean that indicates whether the node read the last of the data for the tag.


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