Operating Instructions

6
Trends
Online / Offline Trend
34
Siemens Desigo™ CC Getting Started A6V10415475_en_a_21
Building Technologies 2015-06-30
6 Trends
A key functionality of a management system is the acquisition and recording of
measured values from the customer site. For example , you might want to track the
readings of:
 a room-temperature sensor over time
 the energy consumption patterns of an air cooling unit
 the status of an air handling unit
This kind of historical data is called a trend. The measured value (such as, a
temperature) that you track in a trend is called a data point.
The Trends application lets you graphically view trends in a chart, called a trend
view. You can assign one or more data points to a trend view to display their trends
together on the same chart. You can also create multiple trend views and save
them for later use.
The management system can acquire trend data in two ways:
 Offline trend data is recorded and stored locally, on the automation station. You
can periodically upload offline trends to view them on the management system.
 Online trend data is instead uploaded continuously to the management system,
and not stored locally on the automation station.
6.1 Online / Offline Trend
Online Trend
An online trend records real-time values from the customer site and displays them
graphically in a trend view. The data values are sent to the Trends application upon
each change of value.
Record Online Trend Data
Trend data is uploaded
continuously to the management
system and not saved locally on
the automation station.