System information

General Reference Guide Monitoring Web Interface
RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 149
6.1.4 Historical window
A check box may also appear in the first column of the View I/O screen meaning that you can choose this Tag to view its historical trend. It
appears only if the historical logging has been enabled in the Tag description (see chapter “Tag Setup” on page 67).
6.2 Historical Trending screen
Warning: depending on the eWON's version - c.f. table at the end of this manual.
From the real time screen, users can select Tags (providing that the historical logging has been enabled for those Tags) by clicking on the related
checkbox and request a graph for these Tags by clicking on the Show Graph for selection link above the real time tabs. Up to 4 Tags can be
selected at the same time to be plotted on the graph.
Figure 112: eWON historical trend configuration - 1
The user has then to select the correct time range for the Tag's selection and click on the Update graph link to obtain a historical trend. The
common axis checkbox allows visualizing all the Tag names on the same axis. If the scales are different, it is clearer to display each curve with its
own scale (by unchecking the Common Axis checkbox).
Figure 113: eWON historical trend configuration - 2