A pen is the plotted data from a tag.  The pen group selector drop-down list displays the names of the pen groups that have been configured for your application, and enables you to re-load a group by selecting it.

Instructions on adding, loading and modifying pen groups can be found in the topic Pen Groups.

The Tag Selector button in the tool bar can be clicked to open the Tag Selector dialog, from which you can select the tags whose data you wish to plot. Additionally, the Tag Selector enables you to perform the following tasks:

•    Add one or more pens (tag values) to the graph

•    Remove pens from the graph

•    Save pen groups

•    Delete pen groups

•    Edit the parameters for a selected pen

•    Preview the expanded tag list

•    Filter available tags by a variety of criteria

A detailed description of the Tag Selector is provided in the topic: HDV Tag Selector Dialog.

The Export Wizard button enables you to export data for the tags currently being plotted on the Historical Data Viewer page to an ODBC-compliant database, or to a comma-separated value (CSV) file.  See: Exporting Data.

The duration selector drop-down list allows you to select from a variety of preset time periods or durations for the data being plotted on the graphs. These durations apply to all pens plotting data on both the analog and digital graphs. You may choose a preset duration ranging from 1 second to 5 years to change the time scale below the graph(s).

See: Changing the Time Duration Displayed on the Graph

The Select Start Date button launches a calendar that you can use to select a month and day on which you wish to see historical data for the pens in the pen legend.

Instructions on using the calendar can be found in Selecting a Date.

The Zoom In X-axis button enables you to change the time scale on the x-axis to display a shorter time period on the graph(s).

See: Changing the Time Duration Displayed on the Graph.

The Zoom Out X-axis button enables you to change the time scale on the x-axis to display a longer time period on the graph(s).

Instructions on using the Zoom Out X-axis button are provided in Changing the Time Duration Displayed on the Graph.

The Zoom In Y-axis (Analogs Only) button enables you to change the y-axis to display a lower minimum scale range on the analog graph.

The Zoom Out Y-axis (Analogs Only) button enables you to change the y-axis to display a higher maximum scale range on the analog graph.

The Shift Y-axis (Analogs Only) button enables you to shift the position of a selected analog pen on the graph so that it is not obscured by (or does not obscure) the other plots on the graph.

Instructions on shifting analog plots are provided in Shifting an Analog Pen's Scale Range on the Graph

The Reset Y-axis (Analogs Only) button enables you to reset shifted scale ranges and zoomed analog scale ranges to their original state.

The Add Note button enables you to add a note to a selected notebook. The notebook must be part of the pen list and must be selected before the Add Note button will work.

Sends the currently displayed data to the printer.