User Guide

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Siemens User Guide Version 2.1
A6V10415471_en_a_21
Building Technologies 2015-07-15
8 Trends
A key functionality in a building automation and control system includes acquiring
measured values from workflows and processes. This chapter includes all
information required to operate and analyze trends (historical data acquisition).
What is Trend?
All available process data of a system can be recorded and applied to operational
optimization. This allows you to record information on plant states, temperature
curves, switching states, and counter values in a form that is suitable for your
purposes. The measured value data can be displayed and evaluated graphically.
Trends can be conducted short-term as online trends, or over an extended
timeframe using offline trend functions.
Trend Examples
Control monitoring for optimization purposes.
Room temperature measurements relating to the entered setpoint temperature.
Temperature and humidity trends in Pharma.
Trend Functions
Create, delete, and edit Trend View.
Record, analyze, compare, save, print, export any trend data.
Display trend curves.
Display data quality using the appropriate quality symbols.
Trend curve display in 2D.
Time range displayed in absolute/relative time or selectable using a
scrollbar.
Freely zoom in/out.
Manually scale or automatically define individual trend axes.
Freely define the display type for each trend curve (color, font, and so on).