Rockwell Automation 2711-ND3 PanelBuilder v2.60 Software User Manual - Manual (Page 51)

3–9 Planning 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
0 0 0 0 0 0 0 1 0 0 0 1 0 1 0 1
1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768
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.
1 1 1 1 1 1 1 0 1 1 1 0 1 0 1
Signed Integer
(-277)
1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768
0 0 0 0 0 0 0 1 0 0 0 1 0 1 0 1
Unsigned Integer
(277)
1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768
Sign Bit
1 = Negative
0 = Positive
1
-256 + -16 + -4 = -277 (2’s Complement)
Data entered as 277
256 16 4 1
-1 +
Data Formats