Read Tag History

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

Historian Functions
Retain historical tag values to review, troubleshoot, or analyze data over time.
Boolean
Returns the historical tags of a single tag. The data type of the tag must be a Boolean.
DBL
Returns the historical values of a single tag. The data type of the tag must be a double-precision, floating-point number.
I32
Returns the historical values from a single tag. The data type of the tag must be a 32-bit integer.
String
Returns the historical values from a single tag. The data type of the tag must be a string.
Timestamp
Returns the historical values of a single tag. The data type of the tag must be a timestamp.
U64
Returns the historical values from a single tag. The data type of the tag must be an unsigned 64-bit integer.
API Reference
G, HTTP, Python, and .NET APIs allow you to programmatically access SystemLink data services outside of NI SystemLink Web Application.
SystemLink Nodes and Functions Reference for NXG and G Web Development Software
Use SystemLink nodes in NXG or G Web Development Software to communicate data between your test and measurement systems and your SystemLink Server account.
Tag Functions
Use tags to read and write data values between systems and SystemLink Server.
Historian Functions
Retain historical tag values to review, troubleshoot, or analyze data over time.