Changing the Minimum and Maximum Range

If the Auto Range checkbox is not selected, you can change the minimum and maximum range. The trend area will update the scale and the trend will be plotted with the new scale.

• For a selected row, click on the Min Range and Max Range fields in the top header and enter the new value.

The scale of the pen in the trend area will be updated.

When the tag value is beyond the minimum and maximum range the trend line will be truncated to the minimum and maximum range value. The cursor readout always shows the actual value. In the below image even though the tag value is 58, since the maximum range is 46, the trend is truncated to 46 and the cursor readout is showing the actual value 58.

To view the trend line without truncation and see the actual value in the cursor readout, select the Auto Range checkbox. If the minimum and maximum range values specified for a pen are equal, then it is considered as an Auto Range condition and it will ignore the values specified for a pen. In the below image since the Auto Range check box is selected, the trend line is not truncated and cursor readout is showing the actual value.

For more information on Auto Range, refer to the Enable auto range topic.