82 Rockwell Automation Publication ICSTT-RM447M-EN-P - July 2019
Chapter 4 AADvance System Architectures
Mixed I/O Architectures
An application could readily justify dual I/O for some field circuits, but not for
all. It is easy and economical to configure one controller to offer a solution to
cover both options. Consider a dual processor system that needs 16 inputs and
16 outputs, half of which must be duplicated and half of which can be simplex.
This can be fulfilled by controller architecture like this.
Figure 19 - Mixed I/O System Equation
Mixed Safety Integrity Levels
Such is the flexibility of AADvance that a single controller can support mixed
safety integrity levels, for example, if a system needs SIL 3 energize to trip
outputs alongside SIL 2 outputs.
The following example shows how a small a viable controller for mixed
integrity levels can be when built from AADvance modules. There are 16
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