L-DALI User Manual
219
LOYTEC
Version 5.2
LOYTEC electronics GmbH
7.13 Local Trending
7.13.1 Create a Local Trend
The value of a data point can be logged over time. This is referred to as trend data. To
generate trend data a trend object has to be created. The trend data is stored in a data logger
file. This file can be downloaded via FTP in binary or CSV format (see Section 8.1.2).
Trend objects can generate trend logs for single and multiple data points and can be
operated in one of the following modes:
Interval Mode
: In this mode a snapshot of all trended data points is logged into the
data logger file. Aligned log intervals can be configured.
COV Mode
: In this mode, each of the trended data points is logged separately, if and
only if its value changes. For analog data points, a specific COV increment can be
configured in the data point configuration properties of the trended data point.
Trigger Mode
: In this mode a snapshot of all trended data points is logged each time a
trigger condition fires. The trigger condition is applied to a trigger data point.
To Create a Trend Object
1.
Select the
Trend
folder of the device.
2.
In the data point list right-click and select
New Trend …
from the context menu.
3.
In the
Create New Trend Object
dialog (shown in Figure 199) enter a name and
optionally a description for the trend log object.
Figure 199: Basic Trend Object Configuration.