Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 67)

Rockwell Automation Publication 1715-UM001C-EN-P - March 2014 67
Installation Instructions Chapter 2
Install Termination Assembly
to I/O Base Unit
I/O termination assemblies determine the type of I/O modules that can be
installed in a particular slot. The I/O termination assemblies provide the
mechanism to connect the field wiring specific to the I/O module type to the
back of one or more installed I/O modules. I/O termination assemblies are
available in single-width and double-width varieties. A single-width I/O
termination assembly connects the field wiring to a single I/O module slot for
simplex operation, where a double-width I/O termination assembly connects the
field wiring to two I/O module slots for duplex/redundant operation. I/O
termination assemblies can span I/O base unit boundaries, though the I/O base
units must be connected directly. I/O termination assemblies are keyed so that
only I/O modules appropriate to the termination assembly type can be installed.
Each redundant I/O subsystem supports a maximum of 24 I/O module slots,
which can be configured with 24 simplex I/O termination assemblies, 12 duplex
I/O termination assemblies, or any combination in between.
Once the base units and termination assemblies have been installed, the insertion
and removal of modules does not disturb other electrical connections.