semaphore TBOX LT2-530 Series User Manual page 135

In case you wish to make recording every day, or even with a longer period, the options are:
The hour of the day, the day of the week and/or the month are defined once for all sampling
tables in the RTU Advanced properties (see chapter 7.6.3)
Size: The size can be expressed on two ways:
Size: the number of records of the table.
The recording works on the FIFO principle. According to the size, the duration is
updated automatically (see next).
The size can be of maximum 65535 records, with a total of 1 Mbytes in SRAM and 8
Gbytes on micro SD card (optional).
Duration : you may prefer to enter a number of days and hours, in this case the size is
automatically updated.
To adjust the sizes check the available memory with the compile option. See chapter
5.10.2: Compiling a program.
Trigger:
Synchronize each sample on external clock: recording of the value is executed on the positive edge of
the Tag selected, and not with the clock of the CPU.
The period between 2 pulses of the Trigger must correspond to the period selected
between 2 recordings (see above). The period selected with the timestamp of the last
record to rebuild the table.
Example of use of external Trigger: quarter - hour management.
In some industries, every 15 minutes (may vary slightly), your electric company sends a pulse
which is used to calculate the consumption, based on average consumption during 15 minutes.
You will be charged based on the highest consumption.
In order to analyze your consumption and prevent from peaks, you can use this pulse as Trigger.
Recording will be done each time the pulse arrives, but when retrieving data, the calculation of
timestamp will be computed from the time stamp of the last recording and the period.
This means it can only be used if the period between pulses corresponds to a period between 2
recordings (see above).
No sampling if trigger = 0:
only possible when the Tag Trigger is in "high state". When it is negative, recording stops. On
the positive edge of the Tag, the table is erased and a new recording starts.
Reset Tag after sampling:
been recorded.
Version : 1.09

daily: recording once a day

weekly: recording once a week

monthly: recording once per month.
the CPU clock is used to record data (see period above), but recording is
if this option is checked, the RTU automatically resets the register that has
This option works only with registers, NOT I/O !
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