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eWON Family - eWON Support

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6.1.4 Historical window<br />

General Reference Guide Monitoring Web Interface<br />

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<br />

appears only if the historical logging has been enabled in the Tag description (see chapter “Tag Setup” on page 67).<br />

6.2 Historical Trending screen<br />

Warning: depending on the <strong>eWON</strong>'s version - c.f. table at the end of this manual.<br />

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<br />

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<br />

selected at the same time to be plotted on the graph.<br />

Figure 112: <strong>eWON</strong> historical trend configuration - 1<br />

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<br />

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<br />

own scale (by unchecking the Common Axis checkbox).<br />

Figure 113: <strong>eWON</strong> historical trend configuration - 2<br />

RG-001-0-EN ver 1.6 <strong>eWON</strong>® - 22/06/2009 - ©ACT'L sa Page 149

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