Emerson Micro Motion 3711, Руководство по конфигурации и использованию, Страница: 96 / 234

88 Micro Motion
®
Model 3711 Gas Flow Computers
Managing History, Events, and Alarms
8. Repeat Step 6 to assign archive points and archive types to extended history points as required.
Figure 8-3 History Setup window – Extended History panel
8.3.1 Archive types
Archive Type controls how the logged value is calculated. Archive Types available for selection are
listed and defined in Table 8-1.
In addition, the Archive Types displayed for the first eight predefined history points depend on the
configured Averaging Technique (see Table 6-1). The Archive Type for these points cannot be
changed here.
Table 8-1 Archive types
Option Description
Avg – Linear One-second samples are averaged to compute minute, periodic, and daily values for
archiving.
Accumulate – Second One-second samples of a rate value, in EUs per second, are summed over the logging
interval to compute the archived value.
Accumulate – Minute One-second samples of a rate value in EUs per minute are converted to a rate value in
EUs per second, then summed over the logging interval to compute the archived value.
Accumulate – Hour One-second samples of a rate value in EUs per hour are converted to a rate value in
EUs per second, then summed over the logging interval to compute the archived value.
Accumulate – Day One-second samples of a rate value in EUs per day are converted to a rate value in
EUs per second, then summed over the logging interval to compute the archived value.
Current Value The current sampled value is archived.
Totalize The difference between the current sampled value and the sampled value at the last
logging interval is archived. The value being totalized should be an accumulation value
that rolls over at a specific value (e.g., the discrete input ON Counter) rather than at a
specific time (such as Today’s Total or Yesterday’s Total).