Rockwell Automation 5370 CVIM Communications Manual User Manual
Page 18
Chapter 2
Introduction
2–6
When you communicate through the Pyramid Integrator backplane all of the
data words are numbered consecutively and grouped in blocks. When you
use the Remote I/O port, you select a specific block and the first word in
each block is word #0.
Example of Addressing Results Block 1
Word Number
Pyramid Integrator Backplane
RS–232 and Remote I/O
Toolset 1
Toolset 2
24-87
288-351
0–63
In addition, PLC I/O bit numbers are entered in octal format when
referencing 1771 I/O, while PLC files and backplane communications
specify a decimal bit number. Figure 2.2 illustrates how bits are numbered.
Figure 2.2
Bit Numbering
Bit Number if Accessing Data Through
Remote I/O as a 1771 I/O Rack. (Octal Value)
Bit Number if Accessing Data Through the Backplane
or Remote I/O Port Using Integer Files. (Decimal Value)
15
14 13
12 11
10 9
8
7
6
5
4
3
2
1
0
17
16 15
14 13
12 11
10 7
6
5
4
3
2
1
0
1
0 0
0 1
0 0
0 0
1 0
0 1
1 0
1
Example
Word
Memory Addressing (cont’d)