Rockwell Automation T8433 Trusted TMR Isolated 4-20 mA Analogue Input Module - 20 Channel - Manual (Page 9)

Trusted
TM
Module T8433
Issue 11 Apr 10 PD-T8433 9
Figure 2 shows a simplified functional block diagram of the Trusted TM 4-20 mA Isolated Analogue Input
module in a typical installation.
Figure 2 Functional Block Diagram
DISTANT
FIELD
DEVICE
DISTANT
FIELD
DEVICE
A/D
CONVERTER
ARRAY
FIELD LOGIC
CONTROL
HOUSEKEEPING
SLICE POWER
SUPPLY
FRONT PANEL VOTING
LOGIC
HEALTH INDICATORS
VOTED STATUS DISPLAY LEDS
SERIAL DISPLAY LATCHES
IS
O
LA
T
IO
N
B
A
R
R
IE
R
SLICE A
CONTROL
BUS
INTERFACE
HOUSEKEEPING
MODULE TEMP
SUPPLY DIAGS
DSP REFERENCE
IIFTU IFIU
IFIU A
FPIU
FPDU
FRONT PANEL DISPLAY UNIT
TIME STAMP
B
C
HIU
HIU POWER
IMB A
IMB B
IMB C
B C
REDUNDANT
SUPPLY
ISOLATION
FIU POWER B C
B C A
IFIU B
IFIU C
TMR
ISOLATION
AMPLIFIER
1 T
M
R
B
U
F
F
E
R
A
R
R
A
Y
TMR
ISOLATION
AMPLIFIER
20
ISOLATED INPUT FIELD
TERMINATION UNIT
INPUT FIELD INTERFACE UNIT - SLICE A
24V1
24V2
HOST INTERFACE UNIT
FRONT PANEL INTERFACE UNIT
DIAGNOSTIC
D/A ARRAY
A
A
B
C
A
B
C
A
B
C
FTA
T8833
FIELD
TERMINATION
ASSEMBLY
FIELD CABLE
TRUSTED I/O CABLE ASSEMBLY
4-20 m A
V1+
V1-
V20+
V20-
T8433 TMR ISOLATED 4-20 mA ANALOG INPUT MODULE
250 VRMS
WORKING
VOLTAGE
2.5 KV
TRANSIENT
IMB
BACK-
PLANE
4-20 m A
FIELD CABLE
VPOWER[1]
COMMON[1]
VSENSE[1]
VPOWER[20]
VSENSE[20]
COMMON[20]