Echelon LonPoint Application and Plug-In - Manual (Page 184)

13-18 Data Logger Functional Block
The data source information will be included in the tagname for that network
variable if the Source Addr option is selected in the Data Logger plug-in's
Input Options
tab. If the source network variable belongs to a L ON M ARK
object then the object name is included, otherwise the device name is included. If
the Include NV Name option is selected in Formatting Preferences (described
earlier in this chapter), the source network variable name is included.
If the Source Addr option is cleared on the Data Logger plug-in's Input
Options
tab, the DL-10 device’s Data input network variable's name will be
used.
If a list separator is found anywhere in a tagname, it is substituted with an
underscore.
Tagnames are built with object names separated by a colon “:”. The tagname is
formatted using one of the following:
LonMarkObjectName
LonMarkObjectName:OutputNVName
DeviceName:LonMarkObjectName:OutputNVName
DeviceName
DeviceName:OutputNVName
DL10Input:NVName
The order in which these unique data columns appear in the CSV text file is
determined by the order in which the unique data sources first appear in the log
file. For example, the first data column will be the first data source found in the
log file.
Data Lines
The first two fields of any data line are the Date and Time fields. If there are no
timestamped data points at all in the log file then an artificial date and time are
presented as values ascending by one second per line, starting at 01/01/90
00:00:01.
A new data line is included for each of the following:
•
Each unique timestamp in the data log.
•
Each new data point for the same data source in the data log.
For example, if two unique data points appear with the same timestamp then
that line will contain a single timestamp and two columns containing data. If
two unique data points appear with different timestamps then two separate lines
will be generated, one with one data point in one column, and another with the
other data point in another column.
If the Fill Missing Data option is selected in the Data Logger Utility's
Formatting Preferences page, a data point is included in every column of the
data line. If you choose this option then previous data points will be used to fill
out each column. If this is not the choice then the missing data is shown as an