Rockwell Automation T8311 Trusted Expander Interface - Manual (Page 24)

Trusted
TM
Module T8311
Issue 12 Mar 07 PD-T8311 24
5. Fault Finding and Maintenance
5.1. PCBS and Connectors
The TMR Expander Interface Module comprises a single PCB assembly fitted with two connectors,
one each for the Expander Chassis IMB (SK1) and Expander Bus (PL4). These are detailed below.
5.2. Troubleshooting
Symptom Possible Cause Solution
All front
panel
indicators off Lack of power If all other modules within the chassis also show no
indicators, check the power distribution and connection to
the chassis.
Front panel
interface (FCR D)
failure Check if other modules within the chassis have LEDs
illuminated.
Check if it is possible to communicate with other modules
within the chassis – using either the chassis board type
(T8300) or the diagnostic utility. If communications is
possible and this is the only Expander Processor installed,
the failure is within FCRD and the module should be
replaced,
If another Expander Processor module is installed, check its
status indication. If the other module is indicating active
mode, check if communications with the potentially faulty
module is possible (again using either the Expander Chassis
board or diagnostic utility). If communications is possible,
note the information returned as part of the Expander
Processor board and then initiate the module replacement.
Single FCR
indicator
flashing RED Single main FCR
failure. The module will continue to provide communications
between the expander bus and the modules within the
chassis. However, the module should be replaced as soon
as practical.
Multiple FCR
indicating
flashing RED Multiple failure. This condition may be indicated briefly during module
power-up, but in other circumstances, this indicates a failure
beyond the modules fault tolerant capabilities.
If the failed module is not the active module, it should be
removed immediately. A replacement module should be
installed as soon as practical.
If the module was the active module, the system will attempt
to switch to the standby, if it is installed and if the failures do
not occur simultaneously.
Flashing
standby
indicator Software
detected fault This indicates that the TMR Processor has detected a fault
within the module and has switched to the previously
standby module. The faulted module should be removed as
soon as possible and a replacement installed as soon as
practical.