Rockwell Automation T8424 Trusted TMR 120Vac Digital Input Module - Manual (Page 7)

Trusted TM Module T8424
Issue 8 Sep 11 PD-T8424 7
Figure 2 shows a simplified functional block diagram of the Trusted TM TMR 120VAC Digital Input
Module.
Figure 2 Functional Block Diagram
1.1. Field Termination Unit (FTU)
The Field Termination Unit (FTU) is the section of the I/O module that connects all three FIUs to a
single field interface. When installed in a Trusted
TM Controller or Expander Chassis, the FTU field
connector interconnects to the I/O cable assembly attached at the rear of the chassis.
The SmartSlot link is passed from the HIU to the field connections via the FTU. These signals go
directly to the field connector and maintain isolation from the I/O signals on the FTU. The SmartSlot
link is the intelligent connection between active and standby modules for co-ordination during module
replacement.
FTA
Input
Field
Device
F
ie
ld
T
e
rm
in
a
ti
o
n
U
n
it
(F
T
U
)
SLICE A
IMB A
FRONT PANEL
A/D
CONVERTER
FIELD LOGIC
CONTROL
IS
O
L
A
T
IO
N
B
A
R
R
IE
R
SLICE POWER
SUPPLY
HOUSEKEEPING
FIU
SLICE CONTROL A
TIME STAMP
BUS INTERFACE
HOUSEKEEPING
MODULE TEMP
SUPPLY DIAG
DSP REFERENCE
REDUNDANT
SUPPLY
24V1 24V2
HIU POWER FIU POWER
FRONT PANEL
VOTING LOGIC
SLICE B
SLICE C
SERIAL DISPLAY LATCHES
VOTED STATUS DISPLAY LEDs HEALTH
INDICATORS
SLICE B
SLICE C
IMB B
IMB C
HIU
VAC