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14.3 Displaying and Entering Data
Figure 14.1
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Example Screen
Multiple objects are provided for displaying data such as virtual panel lights, push buttons,
numeric value displays, bar graphs, meters, graphs and animated bitmaps. On the XL4/XL4
Prime, these graphical objects (through ladder manipulation of attribute bits) can change
color, flash, or change visibility to attract operator attention.
On objects that accept user input, the input is provided by touching the object or alternately
changing an OCS register (i.e. function key registers). Objects that allow input generally have
a raised 3D appearance. An exception is the binary type objects, such as buttons, which are
shown in a depressed 3D appearance when in the ON state. Objects that normally accept
touch input may be disabled through program control (through ladder manipulation of an
attribute bit). If an object is disabled, the object’s representation changes to a 2D appearance.
On objects that represent non-discrete information, more action may be required beyond that
of simply touching the object. For example, the slider object requires the operator to touch
and slide the control in the direction desired. Alternately, alpha-numeric entry objects invoke
a pop-up alpha-numeric keypad for additional user input. The alpha-numeric keypad is
discussed below.
NOTE: If the numeric entry object displays >>>>>>>, the value is too big to display in the field or
is above the maximum for an editable field. Likewise, if the numeric entry object displays
<<<<<<< in a numeric field, the value is too small to display or is below the minimum for an
editable field.
