Rockwell Automation FactoryTalk Historian SE 3.0 H2H Interface User Guide - Manual (Page 123)

FactoryTalk Historian To Historian Interface User Guide 117
Chapter 14.
Interface Diagnostics Configuration
The Interface Point Configuration chapter provides information on building Historian Points
for collecting data from the device. This chapter describes the configuration of points related
to interface diagnostics.
Note: The procedure for configuring interface diagnostics is not specific to this
Interface. Thus, for simplicity, the instructions and screenshots that follow refer to an
interface named ModbusE.
Some of the points that follow refer to a “performance summary interval”. This interval is 8
hours by default. You can change this parameter via the Scan performance summary box in
the UniInt - Debug parameter category page:
Scan Class Performance Points
A Scan Class Performance Point measures the amount of time (in seconds) that this Interface
takes to complete a scan. The Interface writes this scan completion time to millisecond
resolution. Scan completion times close to 0 indicate that the interface is performing
optimally. Conversely, long scan completion times indicate an increased risk of missed or
skipped scans. To prevent missed or skipped scans, you should distribute the data collection
points among several scan classes.