Rockwell Automation 1794-IRT8XT FLEX I/O Thermocouple/RTD /Millivolt Input Module User Manual - Manual (Page 30)

Publication 1794-6.5.12 - September 2011
18 Install Your FLEX I/O Input Module
Wiring Connections for the FLEX I/O Input Module
Connect the following:
Input types H L + -
Shield
(1)
(1) Terminals 37, 38 and 39 and 46, 47 and 48 are for cold junction compensation, with 38 and 47
as chassis GND.
RTD – 2-wire 1 2
RTD – 3-wire 3 1 2
RTD – 4-wire 1a 2a 1 2
Thermocouple 1 2
Millivolt 1 2
CJC Sensor
Input + Chassis
Ground -
CJC Tail
(1)
(1) Terminals 37, 38, and 39, and 46, 47, and 48 are for cold junction compensation, with 38
and 47 as chassis GND. Connect the tail of CJC1 to terminal 5 and CJC2 to terminal 12
if channels 0…3 or 0…7 are configured for thermocouples. Connect the tail of CJC1 to
terminal 22 and CJC2 to 29 if channels 4…7 are configured for thermocouples.
CJC1 C-37 C- 38 C- 39 A-5 (B-22)
CJC2 C-46 C- 47 C- 48 A-12 (B-29)
Terminal Base Unit Wiring Connections
1794-TB3G, 1794-TB3GK, and 1794-TB3GS Terminal
Base Units
(1)
(1) Terminals 37, 38, and 39, and 46, 47 and 48 are for cold junction compensation. Terminals 16, 33
and 40…45 are chassis ground. Connect tail of CJC1 to terminal 5 and CJC2 to 12 if channels
0…3 or 0…7 are thermocouples. Connect tail of CJC1 to terminal 22 and CJC2 to 29 only if
channels 4…7 are used.
RTD or TC
Channel High Signal
Terminal (H) Low
Signal
Terminal (L) RTD Source
Current (+) Signal
Return (-)
0 A-1 A-2 A-0 A-3
1 A-5 A-6 A-4 A-7
2 A-9 A-10 A-8 A-11
3 A-13 A-14 A-12 A-15
4 B-18 B-19 B-17 B-20
5 B-22 B-23 B-21 B-24
6 B-26 B-27 B-25 B-28
7 B-30 B-31 B-29 B-32
+24V DC Power 34 and 50
24V DC Common 35 and 51
1
2
1
3
2
1
1a
2
2a
1
2
1
2
2-wire
3-wire
4-wire
Thermocouple
RTD
Millivolt
+
-
mV
45332
45359