Rockwell Automation 1756-HIST2G FactoryTalk Historian ME 2.2 - Manual (Page 93)

5 • M ANAGING P OINTS
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The default selections available through the FactoryTalk Historian ME web interface
include:
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SYSTEM
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BatchAct
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Phases
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Modes
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RABoolean
You can use the FactoryTalk Historian SE System Management Tools to create
additional digital sets. For more information, please refer to the FactoryTalk
Historian SE Introduction to Historian System Management guide.
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Scan Type - determines the scan type for the point.
Selections include:
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Polled - polled tags are scanned and the data event (with value and timestamp)
is sent to the local FactoryTalk Historian ME server at the specified scan time
interval.
In general, polled tags are intended for scan rates greater than 0.5 seconds.
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Advised - advised tags are scanned for new values at timed intervals that are
defined by the scan class. However, a new event happens (becomes available)
only if the value has changed from the previous event.
In general, advised tags are intended for scan rates greater than 0.5 seconds.
The Data Collection interface will not put the point on scan if it is configured
at a rate faster than 0.5 seconds.
If Data Collection rates faster than 0.5 seconds are required, use high speed
tags.