User Manual

3–8 Addressing Modes for Your I/O
Publication 1771-6.5.124 – August 1997
When the 1771-ACN15/ACNR15 ControlNet adapter module
addresses a 1-slot I/O group containing a 32-point I/O module, the
adapter module uses the unused word assigned to the adjacent I/O
module slot. For example, the adapter module uses the unused input
word associated with I/O slot 1 (because that slot must hold an
output module and does not use its input word).
Figure 3.7 illustrates the concept of 1-slot addressing with two
32-point I/O modules.
Figure 3.7
1-slot I/O Group Concept With 32-point I/O Modules
32–point I/O Modules
Input Word 0
Output Word 0
Image Table
Words Allocated
for I/O Group 0
Input Word 1
Output Word 1
Image Table
Words Allocated
for I/O Group 1
Slot 0
Input Module
I/O Group 0
Slot 1
Output Module
I/O Group 1
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