Rockwell-automation 2711-ND3 PanelBuilder v2.60 Software User Manual Manual de usuario Pagina 51

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3–9Planning an Application
Publication 2711-6.0
Value Data
Value data occupies a word (2 bytes or 16 bits) that represents a
numeric value. No matter how large or small the value, a whole
word must be assigned unless it is a bit array.
Address N7:2
= 277
0000000100010101
124816326412825651210242048409681921638432768
Floating point values occupy 4 bytes or 32 bits.
PanelView (Tag) Formats
The PanelView terminal recognizes and transfers 7 data formats.
Data Format Range
Bit 0 or 1
Unsigned Integer 0 to 65535
Signed Integer -32768 to +32767
IEEE Floating Point –99,999,997,952 to 999,999,995,904
4BCD 0 to 9999
Bit Array 0 to 65535
Character Array Protocol Dependent
Bit
A bit data type occupies one bit of memory. Its address is given not
as a word (N7:2), but as a bit (N7:2/10). A bit is a location, and
depends on its position in the word. It can be set or reset.
Signed and Unsigned Integers
Signed and unsigned integer values occupy one word (2 bytes or 16
bits) of memory, no matter how small the value.
Every bit has a value that depends on its position in the word. The
value encoded is the sum of the bits that are sent.
111111101110101
Signed Integer
(-277)
124816326412825651210242048409681921638432768
0000000100010101
Unsigned Integer
(277)
124816326412825651210242048409681921638432768
Sign Bit
1 = Negative
0 = Positive
1
-256 + -16 + -4 = -277 (2’s Complement)
Data entered as 277
256 16 4 1
-1 +
D
ata
F
ormats
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