Rockwell Automation T8451 Trusted Industrial Control System - Manual

SDS-8451
Trusted TM Industrial Control System
Trusted TM TMR 24Vdc Digital Output Module-T8451
Issue 9 Sep 2006
FRONT PANEL
DESCRIPTION
The Trusted
TM TMR 24V dc Digital
Output Module interfaces to 40 field
output devices. Outputs are arranged
in five groups of eight outputs. All
outputs in a group share a common
power source and return. Fault
tolerance is achieved through Triple
Modular Redundancy (TMR) within
the same module for each of the 40
output channels.
The module provides on-board
Sequence of Events (SOE) reporting
with a resolution of 1ms. The “event”
is the actual sensing of the field
device loop current.
Each triplicated section (slice) of the
module, receives output data from the
Trusted
TM TMR Processor and sends
its data to an internal safety layer
hardware voter. Each slice uses the
voted data to control the outputs.
Every output channel consists of a
six-element voted array. The output
switch array provides fault tolerant,
uninterrupted control under an output
switch failure condition. Output
switching
and fault diagnostics
comply with the demanding
requirements of IEC-61508 SIL-3 for
First Fault - Fault Tolerant, and
Second Fault - Fail Safe outputs.
When a module fault is detected, the
Trusted
TM TMR Processor will flag the
unhealthy condition, indicating the
need to replace the module. Control
continues
until a replacement
(healthy) 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.
Each output is user configurable to
perform line monitoring of the
connected field devices to detect field
wiring and load failures. Automatic
over-current protection is inherent in
every output circuit which eliminates
the need for fuses.
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 output channels per
module
Five isolated groups of eight
outputs each
Six-element voted output array
Comprehensive diagnostics
and self-test
Guaranteed, First fault – Fault
Tolerant, Second fault – Fail
Safe
Line monitoring on a per
channel basis
Automatic over-current
protection – no fuses required
2500V dc Opto-Isolation
Hot replaceable
Front panel status LEDs for
each channel
Module fault and status
indicators
IEC 61508, SIL 3 safety
applications
On-board 1 ms resolution
Sequence of Events reporting
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