Rockwell Automation T8431 Trusted TMR Analogue Input Module - Manual

SDS-8431
Trusted TM Industrial Control System
Trusted TM TMR Analogue Input Module-T8431
Issue 5 Jan 2006
FRONT PANEL
DESCRIPTION
The Trusted
TM TMR Analogue Input
module interfaces to 40 single-ended
field input devices. A wide input
range and programmable thresholds
allow the module to be used in most
voltage or current 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 40 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
40 TMR 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