Options on the Y-Axis tab
The following table shows the options on the
Y-Axis
tab.Options | Descriptions |
|---|---|
Minimum/maximum value options | This set of options determines the minimum and maximum values for the vertical lines on the chart. |
Automatic (best fit based on actual data) | The lowest data reading serves as the minimum value and the highest data reading serves as the maximum. As the chart acquires new data, the y-axis may re-scale to fit. Tip: We recommend you not select this option if you specify the lower or upper shading boundary in the Pens tab. Otherwise, the shading may not show correctly. |
Preset (use min/max setting from Pens tab) | The lowest and highest minimum and maximum tag values, set up on the Pens tab, serve as the y-axis scale. As the chart acquires new data, the y-axis does not re-scale. When specifying Automatic , or Preset with an overlay, click All pens on same scale (bottom right area of this tab). This ensures that the overlay will be shown on the same scale as the trend chart. If you do not click All pens on same scale, the overlay may be smaller or larger than the shown chart. |
Custom | Specifies minimum and maximum values that serve as the y-axis scale. Tip: If you have a pen with the logarithmic scale enabled, set positive values as the minimum and maximum values of y-axis. |
Minimum / Maximum value | |
Actual minimum value/Actual maximum value | Type an unchanging value as the actual minimum and/or actual maximum value on the y-axis scale. |
Minimum value tag\expr./Maximum value tag\expr. | Select a tag whose values will serve as the minimum or maximum value. |
Display options | |
Isolated graphing | Isolated graphing places each pen in a separate band of the chart. To allow pens to overlap, clear the check box. |
% isolation | Controls the distance between bands when using isolated graphing. (Use a range from 0% to 10%). |
Display scale | Determines whether the y-axis legend is shown on the left side of the chart. |
Decimal places | Controls the number of decimal places included on the y-axis legend. (Specify from 0 to 8). If the number of decimal places is set to anything other than zero, numbers cannot be accurately converted to octal or hexadecimal. In order to provide accurate data, the trend object displays the numbers as decimals, even if Octal or Hexadecimal is specified as the Chart Radix on the Display tab. |
Display grid lines | Determines whether horizontal grid lines show on the chart. |
Major grid lines | Specify from 0 to 30 solid major grid lines. |
Minor grid lines | Specify from 0 to 10 dashed minor grid lines. |
Grid color | Determines the color of the horizontal grid lines. To change the color, click the color square and then click a color from the palette. |
Scale options | These options determine how multiple pens with different minimum and maximum ranges scale together on a chart. |
All pens on same scale | Displays all the pens relative to the same scale. The minimum scale value is the lowest minimum value of all pens; the maximum scale value is the highest maximum value of all pens. |
Each pen on independent scale | Scales each pen independently using the pen's minimum and maximum values as the range. At runtime, operators can click a pen on the line legend to show the scale for that pen. |
Scale using pen | Uses the same scale for all pens on the chart, based on the minimum and maximum values set up for the specified pen. Set up minimum and maximum values on the Pens tab. |
Scale as percentage | Represents y-axis values as a percentage of the minimum and maximum range. The values in the value bar and in the current value legend are also displayed as percentages of the minimum/maximum range. So that operators can reference the actual vertical scale values, the minimum /maximum values shown in the line legend remain as set and do not convert to percentages. |
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