Rockwell Automation Publication ICSTT-RM448M-EN-P - February 2021 45
Chapter 2 The AADvance Safety Controller
Internal Diagnostics and Fault Reset
The AADvance controller contains comprehensive internal diagnostic systems
to identify faults that occur during operation and trigger warnings and status
indications. The diagnostic systems run automatically and test the system for
faults related to the controller, and field faults related to field I/O circuits.
Serious problems are reported immediately, but faults that are not on non-
critical items are filtered to help prevent spurious alarms. The diagnostic
systems monitor such items at regular times, and need a number of
occurrences of a possible 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 all of the controller. The application software uses its variable
structures to report a fault problem; these variables give status reports and are
configured using the AADvance Workbench software or AADvance-Trusted
SIS Workstation software.
Faults in the processor modules are none latching. The controller will recover
automatically and the fault indication will clear once the fault condition has
been removed. Faults in the I/O modules are latched. To clear them a fault reset
signal is sent from the processor module by pressing the Fault Reset button on
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