Siemens US2:9810RC - Log Buffer Configuration

A
Circular (FIFO) logging mode: when the log is full, a new record
overwrites the oldest record
B
Stop-when-full logging mode: when the log is full, any new records are
not logged
Log buffer configuration
The log buffer depth is the maximum number of records that can be stored in the meter’s short-
term memory (RAM) for a particular log.
After records are captured in the log buffer in the meter’s short-term memory, they are replicated
to the long-term memory. Because of inherent differences between short-term (volatile) and long-
term (non-volatile) memory, records can be added more quickly to the short-term memory than
they can be copied to long-term memory.
The logs in the default logging framework have their log buffer depths pre-configured to a value
suitable for most applications. But you can configure the log buffer depth for your applications, if
required (for example, to help ensure the continuity of critical data in high-speed logging
scenarios or to optimize usage of your meter’s memory for your particular logging configuration).
If you are logging data at high speeds, it is important to review your logging needs, and find the
right balance between data retention and memory optimization for your particular situation.
NOTE: If you get a message that you do not have sufficient memory when you try to create a
new log or change the configuration of an existing log, you may need to reduce the log buffer
depths of other logs in order to make memory available for the new log.
Fully buffered logs
A fully buffered log (e.g., a Data Recorder or Waveform Recorder module) is one where the value
of the Buffer Depth setup register is the same as the Depth setup register. This means the buffer
(short-term memory) is set up to use all the available long-term memory allocated for that log. This
ensures the buffer does not run out of space before all the records are replicated to the long-term
memory, regardless of the recording speed (i.e., the rate of record captures).
9810 series - User manual Logging
7EN05-0390-08 234