Rockwell Automation CS300 Trusted CS300 Bridge Module - Manual (Page 32)

Trusted
TM
CS300 Bridge Module
Issue 01 Apr 08 PD-8162 32
5. Fault Finding and Maintenance
The Trusted TM TMR Processor provides fault monitoring, self test and diagnostics functions.
Fault Detection within a Trusted TM / CS300 system can be categorised into four regions –
Trusted
TM
TMR Processor and Expander Hardware
CS300 Bridge Hardware
CS300 I/O Hardware
User Application
Using current Trusted
TM methods for detection of faults, the TMR Processor can monitor for failures up
to the Expander section. The MP is also able to separate Bridge hardware faults from CS300 I/O
module faults. The CS300 I/O modules carry out on-board diagnostic tests which are relayed back to
the TMR Processor via the Bridge module.
The user application can also be programmed to read error flags in the I/O module fault registers to
annunciate the detection of module faults. Second faults that leave the system unable to confirm
healthy operation will result in the TMR Processor stopping all communication with the 8162 bridge
modules, ensuring that critical outputs go to a safe state when the internal watchdogs time out.