Rockwell Automation AADvance Controller Solutions Handbook - Manual (Page 40)

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(ICSTT-RM447J_EN_P) Issue: 09:
Solutions Handbook (AADvance Controller)
Technical Features
TUV Approved Operating System
The AADvance system runs an IEC 61508 approved operating system and the overall
system is certified to IEC 61508, Part 1-7: 19T98 - 2000 SIL3.
Internal Diagnostics
The AADvance controller contains comprehensive internal diagnostic systems to
identify faults that develop during operation and raise appropriate alarm and status
indications. The diagnostic systems run automatically and check for system faults
associated with the controller, and field faults associated with field I/O circuits.
Serious problems are reported immediately, but faults on non-essential items are
filtered to avoid spurious alarms. The diagnostic systems monitor such non-essential
items only periodically, and need a number of occurrences of a potential fault before
reporting it as a problem.
The diagnostic systems use simple LED status indications to report a problem. The
LED indications identify the module and can also identify the channel where the fault
has occurred. There is also a summary system healthy indication for the whole
controller.
The application software uses its variable structures to report a problem; these
variables proved status reports and are configured using the AADvance Workbench.
A Fault Reset button on each processor module serves to clear a fault indication.
However, the diagnostic systems will report a serious problem again so quickly there
will be no visible change in the status indications. Pressing the Fault Reset button when
no fault is indicated has no effect.
Controller Internal Bus Structure
Internal communication between the processor modules and I/O modules is supported
by command and response busses that are routed through the processor and I/O base
units.
The processor modules acts like a communications master, sending commands to its
I/O modules and processing their returned responses. The two command busses IO
Bus 1 and IO Bus 2 carry the commands from the processor to the I/O modules on a
multi-drop basis. An inter-processor link (IPL) provides the communication links
between dual or triple processor modules.
Each I/O module has a dedicated response line back to the processor. The unique
response line for each I/O module provides an unambiguous identification of the
source of the I/O data and assists with fault containment.