Rockwell Automation AADvance Controller Solutions Handbook - Manual (Page 73)

 
Document: 553631
(ICSTT-RM447J_EN_P) Issue: 09:
4-1
It is straightforward to implement single, dual and triple I/O architectures for a
controller. This can provide a mixed level of redundancy, fault tolerance and safety
integrity level an application needs, without over-specifying some of the I/O or the
need to provide a second controller.
In This Chapter
Example Controllers .......................................................................................... 4-1
Mixed I/O Architectures ................................................................................... 4-3
Mixed Safety Integrity Levels ........................................................................... 4-4
Distributed Architectures ................................................................................. 4-5
Typical Network Applications ......................................................................... 4-6
Example Controllers
The following example shows a process protected by one distributed AADvance
system. It uses an 8000 Series Trusted controller to handle bulk I/O, and four
AADvance controllers for other parts of the plant.
Controllers 1 and 2 represent two similar controllers applied to identical, duplicated
areas of plant. The duplication of plant (represented by the two compressors K1 and
K2) in this system allows controllers 1 and 2 to be fail safe designs.
The parts of the plant managed by Controllers 3 and 5 are assumed (for the sake of
this illustration) to need safety instrumented systems certified to a mixture of SIL2 and
SIL3. Controller 3 exploits the flexibility of the AADvance system to provide mixed
SILs within one controller.
Controller 4 manages the fire and gas system throughout the plant. The example uses
an 8000 Series Trusted controller here in a role which uses a large quantity of field
devices. The 8000 Series Trusted controller is completely integrated into the system
and shares the applications with the AADvance controllers.
Chapter 4
Mixed Architectures