HDV Pen Legend

The pen legend appears to the left of the Historical Data Viewer page. It acts both as a guide to the pens that are plotting data on the graph, and as a means of displaying additional relevant data for each. An example of the pen legend is displayed below:

Analog plots are indicated in the pen legend by the  symbol; digital plots are indicated in the pen legend by the  symbol; and notebooks are indicated in the pen legend by the  symbol.

A pen that is selected in the pen legend appears with a rectangle around it (e.g. the first pen in the example above is selected). To select a pen, click it in the legend. To deselect all pens, click the currently selected pen again.

The amount of data that is displayed for each pen is dependent upon the properties you have configured for each. To access the properties for any given pen, select it in the pen legend, and then right-click. Information on modifying pen properties can be found in Pen Properties.

The operator can move the cursor across the graph in order to see a detailed view of the data for any point currently displayed.  The Time at Cursor indicates the point in time currently indicated by the mouse pointer.   The Show Marker checkbox allows you to specify whether or not you wish a vertical line to be attached to the mouse pointer to help guide you as you move it. If the Show Marker checkbox is selected, a vertical line will be attached to the mouse pointer; if the Show Marker checkbox is not selected, a vertical line will not be attached to the mouse pointer to help guide you as you move it.

For each tag, the value displayed on the graph at the indicated point in time will be shown. Units are provided to help interpret the information.