Datasheet

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Siemens Switzerland Ltd http://www.siemens.com/buildingtechnologies-productcatalog 2014
Building Technologies Division
Fully integrated trend data processing allows effortless evaluation and analysis of real-time (online) data and (ofine) historical data.
The trend feature facilitates the monitoring and ne-tuning of the plant. In the Desigo system, this feature is implemented in the form of
Trendlog and TrendlogMultiple objects, in compliance with the BACnet standard.
Trend logging options Sampling options
• Continuous logging • Polling
• Single run • COV polling (Change of Value)
• Logging over a specied period • Event-driven polling
Trend graphs can be displayed on the management station. In addition, the touch panels PXM40/PXM50 and operator units PXM20 as
well as PX-Web can display Desigo PX trend graphs. The management station also allows displays in color and in 2D or 3D.
Trend display for example on the Desigo Insight management station and on the touch panels PXM40/PXM50
Online trend features Ofine trend features
• Real-time display of process data • Ofine data display – no permanent connection required
• Longer periods of time (days, months)
• Based on changes in the value of a data point (COVs) or on
periodic sampling by Trend Viewer (times can be congured)
• Data acquisition in the automation system
• Data are uploaded to the management level at regular
intervals or as needed
System functions
Trend and history function