Rockwell Automation FactoryTalk Historian SE 3.0 H2H Interface User Guide - Manual (Page 126)

Interface Diagnostics Configuration
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Snapshot
The Snapshot column holds the snapshot value of each Performance Point that exists in
Historian. The Snapshot column is updated when the Performance Points/Counters tab is
clicked, and when the interface is first loaded. You may have to scroll to the right to see the
snapshots.
Performance Counters Points
When running as a Service or interactively, this Interface exposes performance data via
Windows Performance Counters. Such data include items like:

the amount of time that the interface has been running;

the number of points the interface has added to its point list;

the number of tags that are currently updating among others
There are two types or instances of Performance Counters that can be collected and stored in
Historian Points. The first is (_Total) which is a total for the Performance Counter since the
interface instance was started. The other is for individual Scan Classes (Scan Class x) where
x is a particular scan class defined for the interface instance that is being monitored.
Rockwell Automation‟s Historian Performance Monitor Interface is capable of reading these
performance values and writing them to Historian Points. Please see the Performance
Monitor Interface for more information.
If there is no Historian Performance Monitor Interface registered with the ICU in the Module
Database for the Historian Server the interface is sending its data to, you cannot use the ICU
to create any Interface instance‟s Performance Counters Points:
After installing the Historian Performance Monitor Interface as a service, select this Interface
instance from the Interface drop-down list, then click Performance Counters in the parameter
categories pane, and right-click on the row containing the Performance Counters Point you
wish to create. This will bring up the context menu: