Echelon SmartServer 2.2 - Manual (Page 430)

SmartServer 2.2 User’s Guide 431
The Data Logger: View Web page includes a trend graph and a log that chart and list the data
point updates that have been recorded by the data logger.
3. The trend graph charts all the data point updates recorded by the selected Data Logger. For
multiple data points to be scaled accurately on the trend graph at the same time, they must have
the same Unit String property. You can add a unit string to a data point or edit the one defined
for it in the Configure - Data Points Web page on the SmartServer. In addition, if the selected
points have structured data types, the same fields must be selected.
You can move the mouse pointer over one of the plotted data point updates to show a ToolTip.
The ToolTip lists the date and time of the update and the value and state of the data point at the
time the update was recorded.
4. The log lists the first to last data point updates recorded by the selected data logger in descending
chronological order. You can sort the data point updates by clicking a property header. This Web
page displays the following properties for each data point update recorded in a data logger:
Selected Time
Interval Displays the user-specified interval, which determines the data points
currently shown on the Web page. The default interval is the time from the
first to last data point recorded by the data loggers on your SmartServer.

Click Clear Log Interval to clear the currently selected range of data
points from the Web page. Note that the Web page only shows the first
60 entries in the range, but the entire range will be deleted.

Click Clear Entire Log to clear all the selected data points from the
Web page.
Time Displays the date and time when the data point update occurred.
Name Displays the name of the data point that was updated using the following
format: <network>/<channel>/<device>/<functional block>/<data point>.
This is also the location of the data point in the SmartServer tree.
Value Displays the value of the data point at the time of the update. If the data
point is set to a preset value, the preset name will be displayed instead of the
actual value.
Unit Displays the unit string of the data point.
Status Displays the status of the data point at the time of the update.
In some cases, there may be more log entries within the selected range than can be displayed on
the screen at once. In this case, a warning message will be displayed, and you can use the slide
bar to browse the log entries.
5. You can use the slide bar at the top to browse the first to last updates recorded for the selected data
point. Move the slider bar to the left to display older sets of values, or move it to the right to
display the more recent values. If there are too many values within the selected range to be
displayed, a warning message appears informing you that only a subset of the data points is being
displayed.
6. You can specify the time interval for which recorded data point updates are listed in the log and
displayed in the trend graph using the drop-down list directly below the slider. The default is
Entire Range, which means that the log lists the first to last data point updates recorded in the
data loggers on the SmartServer and the trend graph plots the first to last updates recorded for a
selected data point.
For example, select 1 hour to have the log list the data point updates that have been recorded in
the last 1 hour. You can still browse the updates beyond the specified time interval using the
slider.
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