Omron CX-SUPERVISOR - V2.0, Руководство пользователя

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OMRON CHAPTER 11 – Data Logging
Release 2.0 Page 177
Data Set Properties
The Data Set Name field enables the Data Set to be referenced with a meaningful description both in
the Workspace view, and also from the script language. It also forms the prefix for the file name. A
maximum of 26 characters is allowed.
The Period fields allow a period to be entered in Hours, Days, or Months and defines the period of
data to be grouped into a single file. For example, if the Period is set to 1 month, any data logged for
the current month is saved to the same data file, even when the system is stopped and restarted.
When logging spans a Month boundary the data file is closed, and a new file started and given
sequential file name. This allows easy archiving and backup of the logged data. The start of a new
data file is always synchronised to a natural boundary, e.g. for months - the 1st of the month, for days
– 24.00 hours and for hours - on the hour.
The No. Of Files to Keep entry determines the maximum number of data files that are to be kept.
Once the number of files kept has reached the value entered, as each new file is created the oldest file
is deleted. For example, to keep process data for 2 years, you could keep 24 files of 1 month period.
The file names are generated automatically based on the Data Set name, plus a suffix which is
incremented by one as each new file is generated.
If the Keep all Files option is checked the data files management is disabled and no files will be
deleted.
The Start Logging on Application Startup checkbox controls the logging of the Data Set. When
selected, all the Items in the Data Set start logging when the system is started, and stop logging when
the system is stopped. If this option is not selected, then logging must be controlled by the Start/Stop
logging script functions as required by the developer.
Editing Item Properties
The Add/Modify Item properties dialog is shown when adding a new Item , or editing an existing
one.