Definition: Archive

An archive defines where and how the trends belonging to the archive are saved. A trend must belong to an archive.

Once you have created an archive, you can define the parameters for the archive either in the table editor or on the properties pages.

The parameters are grouped on the following tabs on the properties pages:

• General

  This tab contains general parameters such as name and text.

• File settings

  The parameters on this tab define, for example, where (file path) and when (file change event) archive files are generated.

• Recording

  The parameters on this tab determine how often data is recorded, e.g. sampling start and sampling time.

Parameter name	Description
Sample mode	Determines which event archives process variable values.
Sample time	Determines the cycle in which the process variable values are archived if the sample type is set accordingly.
Definition active	Determines whether the object definition is valid.
File name	Name of the archive file
File path	Specifies the directory in which the files are to be saved.
File change event	Defines the event that leads to the creation of a new archive file.
Comment	Optional commentary on the object.
Max. count per file	Sets the maximum number of datasets per file
Max. file count	Limits the amount of archive data
Max. file size	Limits the amount of archive data
Max. size of cache	Defines the maximum number of datasets in the buffer.
Name	Name of the object.
Text	Localisable text for the object.
Flush time of cache	Defines after how many minutes the content of the buffer is saved in the archive file.

• Trend