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Base class files

Base class files hold historical data processed by the system on the basis of the seven built-in formulas (Average, Minimum, Maximum, Sum, Actual, Change and Difference).

The basis for the calculations made by the system are the data scanned in from the PLC specified by the Scan Interval on the Data Management tab of the object properties dialog box.

There are four default base intervals with which calculations may be made. The default intervals may be changed in the System Configuration program. Each base interval is called a ‘base class’ and result in a separate file.

The lowest base class (the lowest calculation interval) is called base class 2 and the highest is called base class 5

Examples of base class file names:

g2970128.bcl

g3970128.bcl

g4970128.bcl

g5970128.bcl

The second character in the file name is the base class, the ensuing six characters form the date when the files were created and the extension is an abbreviation of ‘base class’.

When all four calculation intervals are used in a configuration, there will be four files for each day.

The base class files are located in the report directory.

The base class files may be saved on the hard disk for as long as the user wishes.

Data in the base class files are used for

• historical graph display when

there are no log files for the selected object

there are no log files for the specified time period for the graph

• calculating the hourly values for the standard daily reports

Tips

• The base class files are saved in the Report subfolder of the configuration root folder. If you want to save these files on a file server, you simply specify that location in the System Configuration program.
• You can limit the number of base class files that are saved on the Files tab in the System Configuration program and specify automatic deleting of older base class files.

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