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Rockwell Automation Publication ICSTT-RM448J-EN-P - April 2018
Chapter 4
Before You Begin
I/O base units. Base units are secured in place by top and bottom clips that are
inserted into the slots on each base unit.
Figure 12 - Connecting Base Units with Expansion Cables
The expansion bus accessed from the right hand edge of the 9100 processor
base unit is designated I/O Bus 1, while the bus accessed from the left hand
edge is designated I/O Bus 2. The module positions (slots) in the I/O base
units are numbered from 01 to 24, the left most position being slot 01. Any
