Rockwell Automation FactoryTalk Historian SE 3.0 H2H Interface User Guide - Manual (Page 141)

FactoryTalk Historian To Historian Interface User Guide 135
Click Create to create the ISU tag.
Use the Tag Search button to select a Watchdog Tag. (Recall that the Watchdog Tag is one of
the points for which this Interface collects data.)
Select a Scan frequency from the drop-down list box. This Scan frequency is the interval at
which the ISU monitors the Watchdog Tag. For optimal performance, choose a Scan
frequency that is less frequent than the majority of the scan rates for this Interface‟s points.
For example, if this Interface scans most of its points every 30 seconds, choose a Scan
frequency of 60 seconds. If this Interface scans most of its points every second, choose a Scan
frequency of 10 seconds.
If the Tag Status indicates that the ISU tag is Incorrect , right-click to enable the context
menu and select Correct.
Note: The Historian Interface Status Utility - and not this Interface - is responsible for
updating the ISU tag. So, make sure that the Historian Interface Status Utility is
running correctly.