54 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 2 Installation Instructions
The adapter and base units are DIN-rail mounted and connections are chained
together from left to right.
Base Units
The adapter base unit is always the leftmost base unit in the connection chain.
The total length of the base unit backplane length, including all expansion
cables cannot exceed 10 m (32.81 ft).
A base slot (adapter or I/O) consumes an address whether it is full or empty.
The first adapter in the pair occupies slot 0 and is on the left, the second
adapter occupies slot 1 and is on the right. Only adapters can occupy the slots
of the adapter base.
An adapter base unit can support up to 8 I/O base units (up to 24 I/O modules)
on its right side.
Module positions within the I/O base units are numbered from 2…25, the
leftmost position being slot 2.
The total number of slot positions in the system is 26; adapters occupy slots
0…1 and I/O modules occupy slots 2…25.
Expansion cables can be used to connect base units, as shown here.
This illustration is only an example and is for illustrative purposes only.
Item Description
1 Adapter base unit
2 Adapter A module
3 Adapter B module
4I/O base unit
5 Simplex I/O module
6 Duplex I/O module - first in pair
7 Duplex I/O module - second in pair
8I/O base unit
9 Simplex I/O module
10 Duplex I/O module - first in pair
11 Duplex I/O module - second in pair
12 Power connections
13 Ethernet connections
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