Rockwell Automation T8471 Trusted TMR 120V dc Digital Output Module - 32 Channel - Manual (Page 29)

Trusted
TM
Module T8471
Issue 14 Apr 10 PD-T8471 29
5.4. Companion Slot
For a Companion Slot configuration, two adjacent slots in a Trusted TM Chassis are configured for the
same input 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-wide I/O Interface
Cable that connects both slots to common field wiring terminations. 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 when 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.
De-energised short-circuit templates are only supported on the newer 3.3V modules, and not on the
earlier 5V modules. If a module has been configured with a de-energised short circuit template and an
attempt is made to swap to a 5V module, the swap may appear to be successful but the standby
module has actually rejected the swap. 5V modules have hardware revision B.
5.5. Cold Start
If an I/O module has shut down (due, for example, to two existing faults), the three Healthy LEDs will
be red, the Active and Standby LEDs will be flashing red and the Educated LED will be flashing amber.
The I/O functions provided by this module will have been lost if a hot swap partner has not taken over
control. The module can only be restarted by removing it from its slot and re-inserting it.
If an I/O module is inserted into a functional system slot which previously had no active module (e.g.
removing and reinserting as above), then the processor will educate the module once it has booted.
Once educated, the Educated LED will be steady green and the Active LED will be red flashing.
Input modules will now be reading and reporting their inputs. Output modules have not yet energised
their outputs. To activate outputs and to set the module’s Active LED and the processor’s System
Healthy LED steady green, press the processor Reset pushbutton.