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The Sampling Tables.
Sampling tables use ‘Periodical’ recording (minimum period = 1 second).
Recording in Sampling tables happens at regular intervals and does not depend on signal
variations; it uses the clock of the CPU to determine the recording.
Only the date and time of the last recording are stored, and they therefore require less
memory than do chronologies.
Example of ‘periodical recording’:
Each Tag is recorded into a separate table. There is no practical limit in the number of
tables, but the size of each table is limited.
The database information recorded in
TB
OX
MS
can be retrieved with the use of SCADA
software such as
T
or other HMI package with ‘TComm.dll’ based driver (please call
your distributor).
tem
p
erature
9 :30 9 :45 10 :00 10 :15 10 :30 10 :45
t
By doing a compilation you can check the space
of memory available (see chapter 6.6.2).
Recording into chronologies happens ‘ on event ’, but the
minimum resolution in timestamp is the second .
The sampling for Tags used in Ladder/Basic depends on the
cycle of the process .
For other Tags, sampling is executed every second .
In case of recording using Ladder/BASIC, with several records
during the same second, the data is sorted with the chronological
order (latest at the top) but with the same second.