Rockwell Automation 1756-HIST2G FactoryTalk Historian ME 2.2 - Manual (Page 97)

5 • M ANAGING P OINTS
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S NAPSHOT V ALUE P OINT P ROPERTIES
The Snapshot Value section contains the following fields:
„
Value - the current value of the tag, which is based on the tag type.
„
Timestamp - time and date stamp for the current value of the tag.
Configuring Scan Types
The Data Collection service collects points based on scan type and scan rate. You
must ensure scan types and scan rates are correctly configured for the Data Collection
service. Points may be configured automatically using the Add Points Wizard or
manually, using the Edit Points page. In either case, the point scan type must be taken
into consideration.
To configure a point scan type manually, click Manage Points in the top navigation
bar, and then click Edit Points in the left navigation bar. Select a point to edit it. The
scan type setting is located on the Point Property page and described in the “General
Point Properties” section.
To edit a point scan type automatically using the Add Points Wizard, you must ensure
that your XML Rule file properly defines the scan type and scan rate for Data
Collection.
Configuring Trigger Input and Output Points
This section provides basic information about Trigger Input and Output points.
Sample configurations are provided in the “Trigger Point Configuration Examples”
section. The trigger mechanism for input points and output points is the same, but the
data flow is different. For input points, the data flows from a controller to the
FactoryTalk Historian ME archive. For output points, the data flow is to a controller
from the FactoryTalk Historian ME archive.
For information on manually creating individual points, see “Creating Points”. For
information about using the Add Points Wizard to create points, see “Using the Add
Points Wizard”.