Historian tags

Tags - List of all tags in the selected file in alphabetical order.

Search - Type any part of a tag name in the field to filter the list of tags below.

Properties - When a tag is selected the Properties panel displays tag information. Clicking the Property will show any history.

Description - A string value describing the tag.

Eng Units - A string value of the type of units.

High Limit - The default high value used by trending clients supporting limits.

Low Limit - The default low value used by trending clients supporting limits.

Sample Interval - The minimum number of milliseconds between changing values.

Default High Scale - The default value for the high scale of a trend.

Default Low Scale - The default value for the low scale of a trend.

Annotations - Appears and displays the first annotation if contained within the current file. Clicking the annotation will display all the annotations for the current tag within this file.

Arrow down - Changes the panel to File Options.

Rename - Brings up a dialog to allow the tag name to be changed in:

• This File Only

• Entire DataSet

• This File and all Older Files

• This File and all Newer Files

Range Selector - When a tag is first selected the Range Selector will go to the end of the file and the scroll bar will go to the bottom, showing the most recent record at the bottom of the tag record grid. Tick marks are displayed above the selector indicating the beginning of a vector. Dragging to or clicking near one of these tick marks will snap the single grip to this location. The date/time of the vector at this location is displayed in a tool tip to help locate the time of a record.

Tag Records - Lists the updates stored by the Historian. The Historian is an update by exception type of database. If the value or quality of an update change from the previously stored value a new update will be stored. No compression is done on the data.

Row - Update numbering by vector.

Timestamp - Date\time converted to the time zone and locale of the system.

Value - Value of the type defined in the Type column.

Quality - OPC quality.

Type - Data type of the value.

Vector - A group of updates named with the first timestamp in the group and sized by requested space allocation of the Historian.

Trend - Button to displays a basic trend of the data in the current file for the selected tag. View only (no controls).

Refresh - Button to retrieve any updates to the selected tag since it was expanded for viewing. Available only when viewing the most recent file.