Rockwell Automation T8433 Trusted TMR Isolated Analogue Input Module - Manual

SDS-8433
Trusted TM Industrial Control System
Trusted TM TMR Isolated Analogue Input Module-T8433
Issue 3 Aug 2006
FRONT PANEL
DESCRIPTION
The
Trusted TM TMR Isolated
Analogue Input module interfaces to
20 single-ended or differential
current loop transmitters. The
module is normally used with the
T8833 FTA, which provides power to
the isolated input circuits from the
field loop. The module may also be
used for many other current loop
configurations.
Comprehensive
diagnostic tests are performed on
each input channel, including tests
for out of range values and stuck at
failures.
Fault tolerance is achieved through
Triple Modular Redundancy (TMR)
within the same module for each of
the 20 input channels.
The module can apply a digital filter
to each input channel. Individual
channels can be configured for high
noise immunity (50Hz or 60Hz
rejection), low noise immunity (fast
response),
or pass-through
operation (no filtering).
Each input channel has four
configurable state thresholds, which
may be assigned to SOE reporting.
A change of state triggers an SOE
entry. The on-board Sequence of
Events (SOE) reporting has a
resolution of 1ms.
Each triplicated section of the
module, referred to as a slice,
conditions and measures each
channel independently. Each slice
is opto-isolated up to 2500V dc.
Each slice sends its data to a safety
layer hardware voter that presents
the information from all three slices
to the Trusted
TM TMR Processor.
When a fault is detected on a slice
of the module, the Trusted
TM TMR
Processor will flag the error,
indicating the need to replace the
module. The Trusted
TM TMR
Processor will continue to use the
information
provided by the
remaining two slices until a
replacement module is available.
Replacement modules can be
located in a standby slot next to the
module or in a designated SmartSlot
with a temporary connection to the
same
Trusted TM Termination
Assembly.
Modules may be placed in any I/O
module
slot in a Trusted TM
Processor Chassis or Expander
chassis. Once the I/O module
configuration is set, mechanical
keying is available on all I/O
modules to prevent inserting a
module into an incorrect slot.
Configuration of the module is
carried out using the Trusted
TM
Toolset running on an Engineering
Workstation. Once configured and
loaded into the Trusted
TM Controller,
replacement modules are on-line
educated by the TMR Processor.
FEATURES
20 TMR isolated input
channels per module
Comprehensive diagnostics
and self-test
2500V dc Opto-Isolation
Digital signal filtering on a per
channel basis
Four user configurable
thresholds per channel
On-board 1ms resolution
Sequence of Events reporting
Hot replaceable
Front panel status LEDs for
each channel
Module fault and status
indicators
IEC 61508, SIL 3 safety
applications