Rockwell Automation 1746-NT8 SLC 500 Thermocouple/mV Analog Input Module User Manual - Manual (Page 16)

Publication 1746-UM022B-EN-P - January 2005
1-6 Module Overview
Block Diagram
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
Terminal Block Module Circuitry
C JC A Sensor
Shield
Shield
Shield
Shield
C JC B Sensor
User Selected
Filter F requency
Digital
Value
Analog to
Digital
C onverter
Digital
Filter
multiplexer
Analog
Ground
Wit hin
12.5V
ungrounded
thermocouple
grounded
thermocouple
IMPORTANT
When using multiple thermocouples, the potential
between any two channels cannot exceed the
channel-to-channel differential voltage (12.5 volts).
For more information, see Appendix B.