Rockwell Automation T8424 Trusted TMR 120Vac Digital Input Module - Manual (Page 6)

Trusted TM Module T8424
Issue 8 Sep 11 PD-T8424 6
1. Description
The Trusted TM TMR 120VAC Digital Input is a member of the Trusted TM range of Input/Output (I/O)
modules. All Trusted TM I/O modules share common functionality and form. At the most general level,
all I/O modules interface to the Inter-Module Bus (IMB) which provides power and allows
communication with the Trusted
TM TMR Processor. In addition, all modules have a field interface that
is used to connect to module specific signals in the field. All modules are Triple Modular Redundant
(TMR).
Figure 1 Module Architecture
The Trusted TM TMR 120VAC Digital Input comprises of five sections: AC Digital Input Field
Termination Assembly (T8824), Host Interface Unit (HIU), the Field Interface Unit (FIU), the Field
Termination Unit (FTU) and the Front Panel Unit (or FPU). The T8824 is external to the module,
connecting to it via a FTA cable, but it provides an integral part of the module functionality.
120VAC
FTA
Input
Field
Device
F
ie
ld
T
e
rm
in
a
ti
o
n
U
n
it
(F
T
U
)
FCR A
FIU
PWR SUPPLY
FIELD
INTERFACE
UNIT (FIU)
IS
O
L
A
T
IO
N
HIU
PWR SUPPLY
HOST
INTERFACE
UNIT (HIU)
IMB(A)
FCR
INTERCONNECT
BUS
FCR B
FIU
PWR SUPPLY
FIELD
INTERFACE
UNIT (FIU)
IS
O
L
A
T
IO
N
HIU
PWR SUPPLY
HOST
INTERFACE
UNIT (HIU)
IMB(B)
V1
V2
V1
V2
FCR C
FIU
PWR SUPPLY
FIELD
INTERFACE
UNIT (FIU)
IS
O
L
A
T
IO
N
HIU
PWR SUPPLY
HOST
INTERFACE
UNIT (HIU)
IMB(C)
V1
V2
FRONT PANEL
UNIT
LEDs
FCR D
ISOLATOR
ISOLATOR
24V1
24V2
V1 V2