Siemens 9810 Series, User Manual, Page: 171 / 218

Logging
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 the Data
Recorder module description in the
ION Reference , available for download
from www.usa.siemens.com/pds, for more information on Insert Outage
Records functionality.
Example: fully buffered log records replicated from short-term to long-term
memory
8:46:30.000
8:47:30.000
9:02:30.000
9:03:30.000
9:04:30.000
8:45:30.000
8:46:30.000
8:47:30.000
9:02:30.000
9:03:30.000
9:04:30.000
8:45:30.000
A. Log buffer
B. Long-term memory
C. Total available space
in the log buffer (for
example, 20 records)
In this 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.
Example: Partially buffered log records replicated from short-term memory
to long-term memory
A. Log buffer
B. Long-term memory
C. Total available space
in the log buffer (for
example, 20 records)
In this example, the buffer depth equals 20. The first record has already replicated
to the long-term memory, making room in the log buffer for the new records
(including the newest record, in gray).
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