B&B Electronics VFG3000 - Manual - Manual (Page 126)

P RIMITIVE D ESCRIPTIONS V LINX F IELDBUS G ATEWAY M ANAGER U SER M ANUAL
P AGE 110
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• The Value property is used to indicate from where the data for this primitive
should be obtained. You may select a tag, a register in a communications device,
or an expression that combines a number of such items.
• The Data Entry property is used to indicate whether or not you want the user of
the virtual HMI to be able to change the underlying value via this primitive.
Selecting Local will enable data entry, but prevent access via the virtual HMI
facility of the web server. For data entry to be enabled, the expression entered for
the value property must be capable of being changed. For example, if a formula
is entered, data entry will not be permitted.
• The Type property is used to indicate the type of slider to be displayed. The three
types of sliders allow data entry via buttons, via direct manipulation, or via both
methods. You should note that direct manipulation can be somewhat risky, in
that accidental touches may result in large changes to process values.
• The Get From Tag property is used to indicate whether the data format should be
obtained from the controlling value, or from the Format page. Note that most of
the format values are unused, save the minimum and maximum values.
• The Line Format properties are used to define the style of the primitive’s outline.
• The Fill Format properties are used to define the color and style of the
primitive’s background and of the slider itself. The background is drawn in Fill
Color 2, while the slider is drawn in either Fill Color 1, or the combination of the
two colors that is specified by the Fill Style.