Rockwell Automation 1746-INT4 Thermocouple/MV Isolated/ User Manual - Manual (Page 15)

Publication 1746-UM614B-EN-P - September 2007
Module Overview 15
Block Diagram of
Isolated-Channel Input
Circuits This illustration shows a block diagram for the analog input circuitry.
Block Diagram
+
±
+
±
+
±
+
±
+
±
+
±
2
4
6
8
10
12
14
16
18
Channel 0
Wire Braid
I/O Chassis
Ground
CJCA Sensor
Terminal Block Module Circuitry
Open-circuit
Detection
Multiplexer
Analog to
Digital
Converter
Analog to
Digital
Converter
Analog to
Digital
Converter
Analog to
Digital
Converter
Multiplexer
Digital Value
Channel 0 &
CJC Sensor
Signal
Digital Value
Channel 1
Digital Value
Channel 2
Digital Value
Channel 3 &
CJC Sensor
Signal
8 Hz
Digital
Filter
8 Hz
Digital
Filter
8 Hz
Digital
Filter
8 Hz
Digital
Filter
I/O Chassis
Ground
CJCB Sensor