User Manual

Operating Reference
Trends
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Description
Time Date/Time of the property value of the object.
Value Value of the trended property of the object.
Unit Unit of the trended property
Status Displays either of the following values:
Good – Value of displayed data is good.
Bad – Value of displayed data is bad as per IOWA standards.
Added – Displayed value is added by user.
Corrected – Displayed value is modified by user.
3.6.3 Offline Trends
Offline trend data is used for the long-term storage and retrieval of historical data
for the analysis of entire plants or single processes. With offline trends, data is
recorded directly in the automation station. You can retrieve the data as needed or
automation stations can automatically upload the data. Offline trend data can be
recorded and saved by Trendlog objects within the automation and control system
even when the management station is not connected. The recorded data can then
be saved in the trend database. Offline trend data can be retrieved and displayed
in the trends.
You can create an offline trend to assign the outside temperature to the Trendlog
object in the automation station if you want to calculate energy consumption and
need the outside air temperature series for measured values. You can then
manually or automatically (periodically) upload the recorded temperature data to
store in the management station.