Hardware manual

XBar-R Chart Impact Reference Guide
Datalogic Automation Inc. 4-98
XBar-R Chart
The XBar-R Chart control graphs statistical information on the Control Panel. It is used to show both the
mean value (XBar) and the range (R) of a data set. The XBar portion of the chart shows any changes in the
mean value of the process while the R portion shows any changes in the dispersion of the process.
This chart is particularly useful because it shows changes in the mean value and dispersion of the process at
the same time, making it a very effective method for checking abnormalities in the process. A data set con-
sists of a minimum, mean, and maximum value, separated by commas. Vertical bars represent the data set's
minimum and maximum values. The "XBar" appears as a square at the data set's mean value. When the
number of data sets is greater than the visible chart range, the data set at the beginning of the chart is
dropped and data set is added at the end of the chart.
Property Name What it is
Chart Setup When you click in the value field, the chart setup dialog is displayed. (See
“Edit XBar-R Chart Properties” on page 4-99 for details.)
ToolTip Text Text displayed when the cursor is held over the control in Run mode.
X The X coordinate of the control’s left edge.
Y The Y coordinate of the control’s top edge.
Width The control’s width.
Height The control’s height.
Enabled If True, the control is enabled.
Visible If True, the control is visible.
Chart Title The name displayed at the top of the chart. It may also be edited in the
chart property editor.
Minimum Range
Marker
The "R" minimum for the range, shown as a horizontal line.
Maximum Range
Marker
The "R" maximum for the range, shown as a horizontal line.
Data The display data. A data set consists of a minimum, mean, and maximum
value. The data can be a String, Real list, or Integer list. Values in a String
must be separated by the Data Delimiter character defined on the Data
Tab in Chart Setup.
Run on Data
Change
If True, the control will run when any data value changes
Mean Calculated: Mean of all data pair mean values.
Minimum Calculated: Minimum of all data pair minimum values.
Maximum Calculated: Maximum of all data pair maximum values.
Deviation of
Means
Calculated: Standard deviation of all data pair mean values.