Rockwell Automation 1772-LP3 PLC - 2/30 Programmable Controller Programming and Operations Manual - Manual (Page 313)

Addressing
Appendix A
AĆ6
Using 16ĆPoint I/O Modules
High-Density (16-point) I/O modules provide 16 input terminals or 16
output terminals. 16-point I/O modules use a full word in the input or
output image table. Two 16-point modules (one input and one output) can
be used in a 2-slot I/O group (Figure A.4).
Figure A.4
Illustration of 2Ćslot Addressing with 16Ćpoint Input and Output Modules
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Input
Terminals Output
Terminals
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Output image table word corresponding
to the I/O group (all bits used).
Input image table word corresponding
to the I/O group (all bits used).
2Ćslot
I/O Group
NOTE: 16Ćpoint input and output
modules use two words (one input,
one output) of the image table.
Because these modules use a full word in the image table, the only type of
module you can use in a 2-slot I/O group with a 16-point module is one