Rockwell Automation FactoryTalk Historian SE 4.0 Live Data Interface User Guide - Manual (Page 21)

Rockwell Automation Publication HSELD-UM024A-EN-E–September 2013 21
Chapter 4
Point Source
The FactoryTalk Historian Live Data Interface uses FTLD as a
point source. A point source is a unique, single- or multi-character
string that is used to identify a Historian point as a point that
belongs to a particular interface.
For example, the string Boiler1 may be used to identify points that
belong to the MyInt Interface. To implement this, the Point Source
attribute would be set to Boiler1 for every Historian Point that is
configured for the MyInt interface. Then, if
/ps=Boiler1 is used on
the start-up command line of the MyInt interface, the interface will
search the Historian Point Database upon startup for every
Historian point that is configured with a Point Source of Boiler1.
Before an interface loads a point, it also examines additional
Historian point attributes to determine whether a particular point is
valid for the interface. For additional information, see
"Command-line Parameters (page 39)".
Several subsystems and applications that are shipped with the PI
System are associated with default Point Source characters:
Subsystem Point Source character
Totalizer T
Alarm G and @
Random R
RampSoak 9
Performance Equations C
Do not use these Point Source characters or change the default Point
Source characters for these applications.
PI 3 Server Node: Reserved
Point Sources