User Guide

Trends
Trends Reference
7
205 | 393
Siemens
User Guide Version 3.0
A6V10415471
Building Technologies
2017-11-30
● Triggered
Refers to the BACnet reference names of the selected trigger from reaction,
scheduler or the BACnet reference.
NOTE:
The Trends application is covered by a license. In order to access the Trends
application, you must ensure that the Trends license is available in your system.
7.2.2 Trends in Distributed Systems
When working with trends in a distributed environment, you must understand the
details of the following applicable conditions:
● System Name column - A column named System Name has been added as an
additional column to the Trends application. It displays the name of the system
to which the source object belongs. You can select this column by right-clicking
the column header on the legend and selecting System Name from the menu
options.
● A Trend log multiple object cannot have objects from multiple systems.
● A Trend log or Trend log multiple object can be created only on that system
where the selected trended object belongs.
● You can create a Trend View Definition with objects from multiple systems.
7.2.3 Online and Offline Trends
Online Trend
Real-time values from online trend records of your plant display graphically in a
Trend View. The data values are sent to the Trend application upon each change
of value. The measured values are temporary and can be stored continuously in
the Trend database (online Trendlog object) for later queries. Online trends can be
used for real-time visualization of one or more process variables, usually for
analysis or diagnosis.
You can create the online trend if the room temperature is too low and record data
for specified period and analyze measured values in a trend curve directly on the
management station.
Record Online Trend Data
Trend data are uploaded
continuously to the management
station and are not saved in the
automation station.
70.0°F
71.0°F
72.0°F
73.0°F
1
70.0°F
1
70.8°F
2
70.3°F
3
70.8°F
4
72.5°F
2
71.0°F
3
72.0°F
4
71.0°F
5
72.0°F
6
71.0°F
Time
interval
based
COV
based
= 1.0
Room temperature
Interval
64°F
64°F
64°F
Trend DB
Management Station
Automation
Station