Storage recording is performed as follows:

•After defining a table, data is recorded according to these configurations. If there is a variation on Tag's quality, data is also recorded

•Data is not recorded only if this variation occurs on a period shorter than the minimum programmed

As new data is retrieved for the variables, an algorithm for record checking interprets this sequence and decides whether each point is stored or not.

This check, however, only occurs for analog fields. For text and digital fields, any value or quality change is enough for recording.

For each type of magnitude stored, a set of tables is generated, one for analog Tags, another set for text Tags, and a third set for digital Tags. Thus, each Storage can manage up to seven tables (backup), in case users specify that these three types of Tags must be stored:

•<TableName>_Fields

•<TableName>

•<TableName>_Text

•<TableName>_Bit