Logging 9810 series - User manual
235 7EN05-0390-08
You may want to use this configuration if you are logging critical data (for example, revenue logs)
or logging data at frequent intervals (for example, intervals less than 60 seconds). However, it is
important to note that this configuration uses the most short-term memory, or RAM (the meter has
a maximum 10 MB of RAM available for the log buffer depth).
Partially buffered logs
A partially buffered log (e.g., for a Data Recorder or Waveform Recorder module) is one where
the value of the Buffer Depth setup register is less than the Depth setup register. This means the
buffer (short-term memory) is set up to use only a portion of the available long-term memory
allocated for that log. This configuration allows for a larger log size (i.e., number of records).
However this does not ensure that the buffer does not run out before all the records are replicated
to the long-term memory (e.g., in the case of high-speed recording).
You may want to use this configuration for logs with intervals greater than 60 seconds or with less
critical data. Because the records are partially replicated, this configuration uses less of the
meter’s short-term memory, or RAM, in a log that is otherwise configured the same. This allows
you to make more RAM available for other logs with a higher logging frequency or more critical
data.
However, depending on your configuration, there may be instances where the log buffer fills up
faster than it can replicate records to long-term memory. In this case, you may lose records and
see gaps in your data.
NOTE: The Insert Outage Records functionality does not work if the data recorder is configured
as partially buffered. In order to use this functionality, you must configure the data recorder to be
fully buffered. See ION Reference, available from www.usa.siemens.com/pds, for more
information about configuring the Data Recorder module.
Example: Fully buffered log records replicated from short-term to
long-term memory
In the following example, the log buffer equals the log depth and all the records are replicated in
both the short-term memory and the long-term memory.
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