DESIGO building automation system

Trend Viewer
The Trend Viewer application is used to review current process data in real time
(online) and past process data (offline) over a period of time. Trend Viewer is an
easy-to-handle tool used to optimize plant operation and reduce costs.
Trend Viewer tasks:
• Process values and measured values
logged over a period of time.
• Minimum and maximum values retained in
graphs irrespective of time range.
• Monitoring of current plant conditions.
• Plant optimization and fine-tuning.
• Response times appropriate for the support of
large trend databases.
Up to ten process values can be displayed in 2D and 3D graphs in a single trend
view. Both online and offline data can be displayed simultaneously in separate
windows, enabling the user to compare past and current situations.
Drag
Drop
Drag & drop in Trend Viewer
Trend logging
Essentially, trend data can be displayed in three different modes:
• Online trend logging: Displays real-time process data which is updated whenever
a change of value (COV) occurs, or as the result of a time-based scan.
• Offline trend logging: Displays past process data which has been uploaded to a
database at the management level.
• Archive data: Displays older data which has been moved from the trend database
into archive files.
The trend views can be saved and retrieved at a later date. Online trend data is
continuously logged and stored in the trend database.
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Siemens DESIGO Building automation and control system CM110660en_03
Building Technologies
System description