Table Of Contents
Read Tag History
Returns the historical values from a single tag. The data type of the tag must match the polymorphic instance.
tag in
tag in Reference to a tag on the server.
Use Open Tag or Query Tags to obtain this reference.
window
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.
error in
next window
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
tag out Reference to a specific tag on SystemLink Server or SystemLink Cloud.
Use Open Tag or Query Tags to obtain this reference.
values
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
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.
error out
end of data?
end of data? Boolean that indicates whether the node read the last of the data for the tag.