Rockwell Automation FactoryTalk Historian SE 3.0 UniInt Interface User Guide - Manual (Page 52)

Interface Health Points
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tags configured to monitor a particular scan class, the Historian tag attribute Location4 must
be set to a valid scan class. Scan classes are defined with the /f startup parameter. Please
see the list of startup parameters for a description of the /f startup parameter.
Scan Class Point Count
ExDesc Keyword: [UI_SCPOINTCOUNT]
Update Interval: When the associated class is scanned.
 If Location4 is 0, the point monitors the point count for unsolicited tags.
 If Location4 is greater than 0, Location4 specifies the scan class.
Description:
The Scan Class Point Count Tag is the number of tags loaded by the interface for a particular
scan class. The value of this tag is updated after every scan. If there are no points loaded by
the interface for the associated scan class, 0 will be written to the Scan Class Point Count
tag.
Scan Class IO Rate
ExDesc Keyword: [UI_SCIORATE]
Update Interval: At the completion of associated scan class.
 If Location4 is 0, the point monitors the IO Rate for unsolicited tags.
 If Location4 is greater than 0, Location4 specifies the scan class.
Description:
The Scan Class IORate Tag is used to show the health of the input tags defined for a
particular scan class. It is used to indicate the number of events sent to Historian before
exception processing for the given scan class. As long as the current value of the tag is
between zero and the scan class point count inclusive, then the scan class update executed
successfully. If the Scan Class IORate Tag stops updating in Historian, this indicates an error
has occurred and the tags for that scan class are no longer receiving new data. The value of
this tag is updated after the completion of each scan.
Scan Class Bad Value Rate
ExDesc Keyword: [UI_SCBVRATE]
Update Interval: At the completion of associated scan class.
 If Location4 is 0, the point monitors the IO Rate for unsolicited tags.
 If Location4 is greater than 0, Location4 specifies the scan class.