Rockwell Automation FactoryTalk Historian SE 3.0 Live Data Interface User Guide - Manual (Page 15)

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Principles of Operation
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9
 Servicing output points as events arrive.
 Servicing triggered input points as events arrive.
The Historian Point Database is checked every 2 minutes for points that are
added, edited, and deleted. When point updates are detected, the points are
loaded (or reloaded) by the Interface as appropriate. The 2-minute update
interval can be adjusted with the /updateinterval command-line parameter
discussed in the UniInt Interface User Manual.
The manual is located in the UniInt folder (c:\Program Files\Rockwell
Software\FactoryTalk Historian\Server\PIPC\Interfaces\UniInt).
The Interface processes a maximum of 25 point updates at a time. If more
than 25 points are added, edited, or deleted at one time, the Interface will
process the first 25 points, wait 30 seconds (or the length of time specified
by the /updateinterval parameter, whichever is lower), process the next 25
points, and so on. After all points have been processed, the Interface will
resume checking for updates every 2 minutes (or the length time specified
by the /updateinterval parameter).
All tag edits are performed in the following way: old versions of edited
tags are deleted from the interface, new versions are added in. Therefore, it
is more efficient to stop and restart the interface if a large number of tags
are edited.
FactoryTalk Diagnostics
The FTLD Interface sends messages about its operation to FactoryTalk
Diagnostics.
FactoryTalk Diagnostics provides the following information about the
FTLD Interface:
 Informational messages on the interface startup and shutdown.
 The scan rate of each scan class.