Rockwell Automation 1771-ACNR15 CONTROLNET ADAPTER MODUL - Manual (Page 32)

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
3 2 –p o in t I/O M o d ules
In pu t W o rd 0
O u tp u t W o rd 0
Im a g e T a b le
W ord s A llo ca te d
fo r I/O G ro u p 0
In pu t W o rd 1
O u tp u t W o rd 1
Im a g e T a b le
W ord s A llo ca te d
fo r I/O G ro u p 1
S lo t 0
Inp u t M o d u le
I/O G ro u p 0
S lo t 1
O u tp u t M o d u le
I/O G rou p 1
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