Data Sheet for Product

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Siemens Web Server OZW772... V8.0 CE1N5701en
Building Technologies 2018-03-15
The trend function can be defined directly in the web server OZW772… as of ver-
sion 5.0.
Any number of data points for connected devices can be logged at a selectable
sample rate and queried using the trend function.
Data points for devices integrated via KNX S-Mode are also available for the trend
function.
5 trend channels are available: Each trend channel can include up to 100 data
points. The trend channel can be labeled using a plain text name.
The sample rate can be created individually for each trend channel. Sample rates
from 1 second to 25 hours are available.
The shortest possible sample rate over all 5 trend channels is 1 data point per se-
cond.
Memory determines the possible trend period of a trend channel. The trend period
varies with the number of selected data points and their sample rate.
Examples for various trend channels:
Interval
Data points
Trend period
Channel 1
Channel 2…5
1 sec
1
14 days
1.8 days
5 sec
5
30 days
4.3 days
1 min
10
210 days
30 days
15 min
100
371 days
53 days
Memory that is 7 times greater is available in trend channel 1 for long-term trending
with a lot of data points, or short sample intervals.
Trends are synchronized to simply the evaluation of trend data. The various query
intervals for the trends are set up on one interval grid.
A web browser or the ACS tool creates and manages trend functions.
The trend data can be downloaded for each channel using a web browser and
viewed in a spreadsheet program or text editor. The calendar function permits limit-
ing the trend data to a desired time period within the trend.
Users can access the web server either local or remote via the Internet.
Trend function
Trend channels
Sample rate
Trend period
Synchronization
Operation
Data query per web
browser