Y-Axis page (TrendPro)

How do I open the Y-Axis page (Properties dialog box)?
  1. On the
    Properties
    dialog box, click the
    Traces
     tab.
  2. Click the tag name in the left pane.
  3. Click the
    Y-Axis
     radio button.
Y-axis properties allow you to define how the y-axis displays information for the current trend. The properties are applied immediately to the current trend.
TIP:
You can add a new trace or a parameter to the trend by clicking Add trace icon. Parameters accept a format of #
number
, such as #1.
The following options are available:
Property
Description
Label
The options to include in the axis label. The following options are available:
  • Click the
    Include engineering units
    check box to append the short form of the engineering unit to the label such as lbs or m
    3
    .
  • Click the
    Use default text
     check box to display the short name of the tag.
  • In the
    Text
     box, enter custom text after clearing the
    Use default text
     check box.
Axis
The display options for the axis. Select from the following options:
  • Click the
    Visible
     check box to show the axis.
  • Click the
    Show grid lines
    check box to show a set of grid lines at each point on the axis.
  • Click
    Font
     to modify the font style, size, and other font related effects.
  • Click
    Line Style
     to modify the line color, style, and width.
Scale
The scale used to determine the best display of data. Select one of the following options:
  • Select
    Automatic
    to automatically scale the analog tags. For discrete, string, and time tags, this option resets to a default scale (the scale from a brand new trace for tags of those types).
    If logarithmic mode is enabled, automatic scaling sets the minimum and maximum major tick marks to immediately bounding values for the specified logarithmic base; this is the next lower logarithmic value smaller than the minimum, and the next higher logarithmic value larger than the maximum. Examples of this are:
    Data Range
    Base
    Tick Marks
    1-101
    2
    1, 2, 4, 8, 16, 32, 64, 128
    2-101
    10
    1, 10, 100, 1000
    500-600
    2
    256, 512, 1024
    500-600
    10
    100, 1000
  • Select
    Min / Max
     to calculate values based on the actual minimum and maximum properties set on the tag. A 10% padding is added to both the min and max to provide a "frame" around the trace. For example, if the tag min and max is 1 and 10 respectively, the calculated value of the Axis Min and Axis Max will be -1 and 11. You can also manually set the minimum and maximum values for the y-axis.
    If logarithmic mode is enabled, the axis minimum defaults to the smallest number above zero that matches the currently specified precision (i.e., 0.01 for a precision of 2). The axis maximum uses the lower-bound of the smallest number above zero that matches the currently specified precision. Examples of this are:
    Specified Range
    Base
    Tick Marks
    5-101
    2
    5, 10, 20, 40, 80, 160
    5-101
    10
    5, 50, 500
    500-600
    2
    500, 1000
    500-600
    10
    500, 5000
  • Select
    Use tag Min and Max properties
    to force the scale to match the minimum and maximum values dictated by the tag Min and Max properties.
    Note:
    This option only supports Historian tags.
  • Select
    Use tag value
     to force the scale to match the minimum and maximum values specified by the tags. Enter a tag placeholder or click to select a tag.
    Tip:
     You can use the extended tag properties
    .@Min
     and
    .@Max
     for ControlLogix direct reference tags.
You can quickly switch between the automatic and min/max settings by toggling
Automatic Scales
 in the toolbar.
Mode
The scale to use for numeric types. Select from the following options:
  • Click the
    Logarithmic
    check box to apply a logarithmic (nonlinear) scale for numeric types.
    Note:
    If the value on the axis is a type other than numeric, this option is disabled.
  • In the
    Base
    box, type a value between 2 and 1000 for the base.
Tick marks
The short lines along the axis line that specify value divisions. Select one of the following options:
  • In the
    Major\Major every
     box, type the number of major tick marks that display on the y-axis line. Typing zero in this box displays two major tick marks on the y-axis. If automatic scaling is set on the axis, it automatically determines the best number of major and minor tick marks to use. You can override the number of minor tick marks, but not the number of major tick marks.
  • In the
    Minor
     box, type the number of unlabeled value divisions along the y-axis. Typing zero in this box displays two minor tick marks between each mark on the axis.
    Note:
     If
    Logarithmic
     mode is enabled, tick marks are disabled.
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