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SDS-8424
ed TMR 120 Vac Digital Input
Trusted
TM
Industrial Control System
TrustedTM TMR 120V ac Digital Input Module-T8424
FRONT PANEL
T8424 Trust
DESCRIPTION
The Trusted
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.
TM
TMR 120Vac Digital
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
fault is detected on a slice of the
module, the Trusted
Processor will flag the error,
indicating the need to replace the
module. The Trusted
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
Termination Assembly.
Modules may be placed in any I/O
module slot in a Trusted
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
running on an Engineering
Workstation. Once configured and
loaded into the Trusted
replacement modules are on-line
educated by the TMR Processor.
TM
TMR Processor. When a
M
T
TM
TMR
TM
Processor
TM
Toolset
TM
Controller,
TMR
TM
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
Issue 2 Jan 2006
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SDS-8424
Trusted
TM
Industrial Control System
TrustedTM TMR 120V ac Digital Input Module-T8424
FTA
Input
Field
Device
VAC
Field Termination Unit (FTU)
FIU
A/D
CONVERTER
SLICE A
SLICE B
SLICE C
FRONT PANEL
SERIAL DISPLAY LATCHES
VOTED STATUS DISPLAY LEDs
FIELD LOGIC
CONTROL
HOUSEKEEPING
SLICE POWER
SUPPLY
ISOLATION BARRIER
FRONT PANEL
VOTING LOGIC
HEALTH
INDICATORS
HIU
SLICE CONTROL A
TIME STAMP
SLICE B
SLICE C
BUS INTERFACE
HOUSEKEEPING
MODULE TEMP
SUPPLY DIAG
DSP REFERENCE
HIU POWERFIU POWER
REDUNDANT
SUPPLY
24V1 24V2
BLOCK DIAGRAM
ELECTRICAL SPECIFICATION
Number of Inputs
Field Common Isolation
Sustained Working ±250V dc
Maximum Withstanding ±2.5kV dc
Input Voltage
Measurement Range 150V ac
Maximum Withstanding 250V ac RMS or dc
Channel Input Resistance
Power Consumption
Sample Update Interval (no
filter)
Self-Test Interval
Sequence of Events
Event Resolution 1ms
Time-stamp Accuracy ±0.5ms
Thresholds
Turn-on Voltage 82V ±10%
Turn-off Voltage 26V ±10%
Fusing
Intrinsic Safety
Circuit Type
40 Channels
25k:
15 to 18W
5ms
2 minutes
50mA on T8823 FTA
External barrier
Fault tolerant, fully triplicated
IMB A
IMB B
IMB C
MECHANICAL
SPECIFICATION
Dimensions (HxWxD):
241mm x 30mm x 300mm
(9.5ins x 1.2ins x 11.8ins)
Weight:
1.13kg
(2.5lbs)
ENVIRONMENTAL
Operating Temperature:
-5°C to 60°C
(23°F to 140°F)
Operating Humidity:
5 to 95%, noncondensing
Vibration:
10 to 57Hz ±0.075mm
57 to 150Hz 1.0g
Shock:
15g, ½ sine wave, 11ms
EMI (IEC 801):
ESD
Air discharge to 15kV
Contact discharge to 8kV
Radiated Fields
10V/m, 27MHz to
500MHz
Transients and Bursts
2kV, 2.5kHz for
t=60 seconds
ICS Triplex
Technical data sheets are intended for
information and guidance. The Company
has a policy of continual product
development and improvement.
Specifications are subject to change
without notice. For latest information, visit
our Websi te:- www. icst ripl ex.co m