Product specifications

History Configuration
3BDS011222-510 B 345
value added to the log must be greater or equal to 70.35 or less or equal to
63.65.
The data in a log is reduced by several methods without losing the process critical
information because of limited storage capacity in a log. Also refer to Figure 212.
• If a sample is received more often than the minimal storage interval of the log
(For example, 1s), the log stores the latest of all values of the interval.
• If a received variable only is changed by a value more than the exception
deviation (For example, 5%, analog values only), this is stored in the log.
• If a variable is changed by a value less than the exception deviation, it may be
forced into the log after the logs maximum storage interval (For example, 4s) is
elapsed. A latest sample received will stored to the log when the Max time is
reached. This does not store the previously stored good value if different from
the latest sample.
Figure 212. An example describing the storage capacity of a log
Table 19. Aggregates
Aggregate Description
Interpolated The interpolated values.
Total The time integral of the data over the re-sample interval.
Average The average data over the re-sample interval.
Timeaverage The time weighted average data over the re-sample interval.