Echelon LonPoint Application and Plug-In - Manual (Page 180)

13-14 Data Logger Functional Block
Include NV Name Adds the Network Variable name, if available, to the
end of the tagname (see Tagnames, later in this
chapter).
4 Digit / 2 Digit Year Selects one of two year formats for timestamped data
(see Timestamp in the Input Options tab of the Data
Logger functional block).
Fill Missing Data If selected, the previous value of any columns without
updated values will be included in each data line.
Floating Point Format Select Best Fit for a 5 digit plus decimal point
display. Select Scientific-notation for a full
mantissa plus exponent display.
Monitoring Preferences
The Data Logger Utility can obtain Network Variable updates from the Data
Logger functional block's Full network variables using either Polled or Bound
monitoring. Which one you should use depends on how you are using this
applicaton.
Polling the level output network variables in the DL-10 device results in a
quicker start-up and shut-down of the Data Logger Utility in many cases. If you
are running the Data Logger Utility as a scheduled job where you want to start
it up, process any log files as required, and shut it down, then polling is the best
choice. If the utility is left up and running is will periodically poll the Full
network variables.
Bound network variables result in less network traffic if you plan on
continuously running the Data Logger Utility as a background task. The levels
are only updated in the utility when they cross the configurable Full % values
set in the Log Options tab of the Data Logger functional block, and these
updates occur immediately rather than at a poll interval. Bound network
variables can also be used with remote hosts that are periodically attached via
an SLTA-10 network interface. In this case, the binding should be left in place so
a network variable update event from a DL-10 device will cause the SLTA-10
network interface to dial-out to the remote host.
The bound network variable case can add time to the utility's start-up since the
binding must take place at that time if it is not already in place. If you do not
select the Disconnect NVs on close option then start-up and shut-down times will
be shorter since the connections are left in place.
When bound network variables are used, these connections can be re-used for
each selected Network:Subsystem combination. When monitoring a new set of
DL-10 devices from a given Network:Subsystem combination, network variables
must be re-bound. In this case the previous connections are removed by the
utility and a new set is created.