Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 56)

56 Rockwell Automation Publication 1715-UM001C-EN-P - March 2014
Chapter 2 Installation Instructions
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; 0…1 are occupied by
adapters and 2…25 are occupied by I/O modules.
Expansion cables can be used to connect base units, as shown here.