Rockwell Automation T8310 Trusted Expander Processor - Manual (Page 24)

Trusted
TM
Module T8310
Issue 12 Dec 06 PD-T8310 24
5. Fault Finding and Maintenance
5.1. Fault Reporting
Input module faults are reported to the user through visual indicators (LEDs) on the front panel of the
module. Faults are also reported via status variables which may be automatically monitored in the
application programs, and external system communications interfaces. There are generally two types
of faults that must be remedied by the user; external wiring and module faults. External wiring faults
require corrective action in the field to repair the fault condition. Module faults require replacement of
the module.
5.2. Companion Slot
The Expander Processor operates in a Companion Slot configuration. Two adjacent slots in a
Trusted
TM
Chassis are configured for the same module function. One slot is the primary slot and the
other a unique secondary (or spare) slot. The two slots are joined at the rear of the Trusted TM Chassis
with a double-width Interface Cable that connects both slots to common IMB connections. During
normal operations, the primary slot contains the active module as indicated by the Active indicator on
the front panel of the module. The secondary slot is available for a spare module that will normally be
the standby module as indicated by the Standby indicator on the front panel of the module.
Depending on the installation, a hot-spare module may already be installed, or a module blank will be
installed in the standby slot. If a hot-spare module is already installed, transfer to the standby module
occurs automatically if a module fault is detected in the active module. If a hot spare is not installed,
the system continues operating from the active module until a spare module is installed