semaphore TBOX LT2-530 Series, Руководство пользователя, Страница: 132 / 197

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The Sampling Tables.
Sampling tables use ‘Periodical’ recording, with a minimum period of 1 second.
Recording in sampling tables happens at fixed intervals and does not depend on signal variations; it uses
the clock of the CPU to determine the recording.
Date and time of only the last record is stored. This mechanism requires less memory than chronology
does. Timestamps are re-built when data is generated (by report or by polling)
Example of ‘periodic recording’:
Each Tag is recorded into a separate table. The maximum number of tables is 2000 and the size of each
table is of maximum 65535 records. To increase quantity of data recorded, recording on micro SD card can
be considered (see Chapter 7.6.3. RTU properties -> Sampling Tables)
The database information recorded in
TB
OX
LT2
can be displayed directly on WebForm or retrieved with
the use of SCADA software such as TView or other HMI package running ‘TComm.dll’ based driver (please
call your distributor).
By doing a compilation you can check the space of memory available (see chapter 5.10.2).
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