Rockwell Automation T8424 Trusted TMR 120V ac Digital Input Module - Manual

SDS-8424
Trusted TM Industrial Control System
Trusted TM TMR 120V ac Digital Input Module-T8424
Issue 2 Jan 2006
FRONT PANEL
DESCRIPTION
The Trusted
TM TMR 120Vac Digital
Input module interfaces to 40 field
input devices. The module has broad
voltage
thresholds defined to
IEC61131-2 and is designed to be
used with Field Termination Assembly
T8823 which provides a current
sourcing interface. Comprehensive
diagnostic tests are performed on
each input channel, including tests for
stuck on and stuck off failures. Fault
tolerance is achieved through Triple
Modular Redundancy (TMR) within
the same module for each of the 40
input channels.
The module provides on-board
Sequence of Events (SOE) reporting
with a resolution of 1ms. A change of
state triggers an SOE entry.
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
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
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