Rockwell Automation AADvance Controller Solutions Handbook - Manual (Page 86)

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5-6 Document: 553631
(ICSTT-RM447J_EN_P) Issue: 09:
Solutions Handbook (AADvance Controller)
Redundancy and Fault Tolerance
A significant advantage of the AADvance design is the option to add redundant
modules to increase fault tolerance as an when they are required. Redundant
configurations allow you to replace faulty modules without affecting the system
operation.
This flexibility and operational persistence is made possible by Termination Assemblies
that provide redundant I/O module capacity. By installing a triple termination assembly
you can configure the I/O and use it in a simplex, dual or triple redundant
arrangement.
The AADvance controller therefore provides an economical solution for redundancy
and fault tolerance expansion. You can install the termination assemblies and base units
for additional future capacity, then add the extra I/O modules only when you actually
need them.
Expansion using Distributed Controllers
You can expand any AADvance system by adding extra controllers. The internal
protocols used by the controller do not place limits on the number of controllers you
can have in a system. The AADvance Discover (Discovery and Configuration utility)
enables you to connect to external controllers.