Rockwell Automation 2711E-ND1 PanelBuilder 1400E Reference Manual - Manual (Page 63)

56 Numerics
Publication 2711E-820 – January 1998
Field Meaning
Decimal Display (con’t) Implicit—The value from the Displayed Value control will be
displayed as it is, without any external decimal manipulation.
For example, a value of “1” is displayed as “1”. A value of “1.3”
is displayed as “1.3.” If the number of digits following the
decimal point is too large to fit in the display, the fraction is
rounded off to fit the number of digits. For example, if the
display has four digits, and the value is “1.237,” the display will
show “1.24.” If an integer value or the integer portion of a
number can’t be displayed fully, asterisks (***) are displayed
instead.
PLC Controlled—Select this item if you want the position of the
decimal point to be determined by the PLC. This means that the
decimal point is not in a fixed position, and the PLC controls the
number of digits after the decimal point. If the Displayed Value
control is a fractional number and has fewer than the specified
number of digits to the right of the decimal point, the value will
be padded with zeroes. If the value has more than the number
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be padded with zeroes. If the value has more than the number
of digits, the value will be rounded off. The PLC Controlled
decimal position can display 1 to 15 decimal digits. If the value
returned by the Decimal Point Position control is outside this
range, the display field is filled with asterisks (***). If you check
this button, define the Decimal Point Position control.
Fixed Position—Select this item if you want the decimal point
to appear always in the same position. See Digits after Decimal
Point, next.
Tip: Use Fixed Position with an analog tag that has scale and
offset defined to achieve the version 5.10 Scaled Numeric Data
Display capability. Or, define an expression so that it will
manipulate the PLC output to achieve the same effect.
If the Displayed Value control is a fractional number and has
fewer than the specified number of digits to the right of the
decimal point, the value is padded with zeroes. If the value has
more than the number of digits, the value is rounded off.
Digits after Decimal
Point If you specify the decimal point as Fixed Position, enter the
number of digits that will appear after the decimal point. The
maximum is 15.
Control The Numeric Data Display uses the following controls. You can
assign a tag or expression to each control.
Displayed Value contains the value to be displayed. If the
control uses a tag with a float address or a non-standard scale
and offset value, the object can display a fractional value.
Important: If you assign the Polarity control, when you define
the Displayed Value control use a digital or analog tag with any
of the following unsigned data types: byte, binary, bit position,
or 1 to 8 BCD. If you use a signed data type, do not assign the
Polarity control unless you want to override the value’s own
polarity.
Decimal Point Position determines the position of the decimal
point. Define this control if you specified the Decimal Display
field as PLC Controlled. The value of this control determines the
number of digits after the decimal point.
Polarity determines whether or not a minus sign is displayed. If
the Polarity control’s value is other than 0, the minus sign is
always displayed; if it is 0, the sign is never displayed. If this
control is assigned, it overrides the Displayed Value control’s
polarity. Remember to account for the minus sign in the number
of digits you assign.