
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.
Table 2.A
Example of Addressing Results Block 1
Word Number
Pyramid Integrator
Backplane
RS–232 and
Remote I/O
32–95 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
1000100001001101
Example
Word
Memory Addressing (cont’d)
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