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Echelon i.LON SmartServer Technical Information Page 73

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i.LON SmartServer 2.0 Programmer’s Reference
5-8
Property Description
214,748,364.0 seconds. The Data Logger will check for
updates to the data point at this interval. If you do not want
to poll data before updates to the log are possible, you should
set this to a value greater than or equal to the value specified
for the <UCPTlogMinDeltaTime> property.
If you use the default poll rate of 0 seconds, the Data Logger
will record each update to the data points it is monitoring into
the log, assuming that the time period defined by the
<UCPTlogMinDeltaTime> property has elapsed and the
change in value specified by the <UCPTlogMinDeltaValue>
property has been met by the update.
You should note that other SmartServer applications may
cause the Data Server to poll this data point’s value as well.
The poll rate specified by these applications should be
compatible with each other. For example, if an Alarm
Generator is polling a data point every 15 seconds, and a Data
Logger is polling the same data point every 10 seconds, then
the Data Server will have to poll the value of the data point
every five seconds to ensure that each application gets a
current value for each poll.
It is important to note this as you set poll rates for various
applications, as you may end up causing more polls than is
efficient on your network. For example, if an Alarm
Generator is polling a data point every 9 seconds and a Data
Logger is polling a data point every 10 seconds, the Data
Server would choose the greatest common divisor and
therefore would have to poll the data point every second to
ensure that each application polls for a current value. This
may create a significant amount of undesired traffic.
5.3.3
Using the Set Function on a Data Logger
Use the Set function to create new Data Loggers, or to overwrite the configuration of existing Data
Loggers. The Data Loggers to be created or written are signified by a list of <Item> elements in the
input parameters supplied to the function. The properties you must define within each <Item> element
are the same, whether you are creating a new Data Logger or modifying an existing Data Logger. The
previous section,
Using the Get Function on a Data Logger, describes these properties.
Note: If you specify a data logger with the <UCPTname> element, the Set function deletes the
specified data logger before the specified parameters are set. If the <UCPTname> element is not
specified, a new data logger is created.
When modifying an existing Data Logger, any optional properties left out of the input will be erased.
Old values will not be preserved, so you must fill in every property when writing to a Data Logger,
even if you are not changing all of the values.
The first invocation of the Set function will generate the #8000010128000000[4].UFPTdataLogger.xml
file in the root/config/network/<network>/<channel>/iLONApp ||<device> directory of the
SmartServer, if the file does not already exist.
When creating or modifying a Data Logger with the Set function, you may want to use output from the
Get function as the basis for your input. You would then only need to modify the values of each
property to match the new configuration you want, as opposed to re-creating an entire string like the
one shown below.
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