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Optimisation of old values processing coming from communication (automatically or as a result of TELL command GETOLDVAL) or values of remote tags (as a result of TELL command GETOLDVAL).
If the checkbox is checked, during processing of old value the archive database is queried whether the value is already present there. If it exists, the value is discarded (and recalcs of statistical or calculated archived values which use this primary archive value are not performed either).
Note: Optimisation is useful e.g. for archiving of I/O tags from communication using the protocol IEC62056-21:2002 File I/O. Its communication files contain several historical values (which KOM process sends as old values) and one new value for every I/O tag.
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Definition of a D2000 system object, values of which are to be archived. The object may be defined either by typing its name into the input edit field or selecting from the list of object. To open the list of object click the button right from the input field.
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The maximum history depth is 999 months, 31 days and 23 hours800 months (approximately 66 years).
Stored time
For periodical data archiving, it is defined, what time data with the value for the given period will be stored into the archive. The time data can present the begin time - Period begin option or the end time of the interval (period) - Period end option.
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