Publication 1794-6.5.12 - November 1997
How to Install Your Thermocouple/RTD/mV Input Module
2
-11
Wiring connections for the 1794-IRT8 TC/RTD/mV Input Module
Type of Input
Connect the following:
H
L
+
–
Shield
1
RTD – 2-wire
1
2
RTD – 3-wire
3
1
2
RTD – 4-wire
1a
2a
1
2
Thermocouple
1
2
Millivolt
1
2
1
Terminals 37, 38 and 39 and 46, 47 and 48 are for cold junction compensation (with 38
and 47 chassis GND).
RTD or
Thermocouple
Channel
1794-TB3G and -TB3GS Terminal Base Units
High Signal
Terminal (H)
Low Signal
Terminal (L)
RTD Source
Current (+)
Signal Return
1
(–)
0
1
2
0
3
1
5
6
4
7
2
9
10
8
11
3
13
14
12
15
4
18
19
17
20
5
22
23
21
24
6
26
27
25
28
7
30
31
29
32
+24V dc Power
34 and 50
24V dc Common
35 and 51
1
Terminals 37, 38 and 39 and 46, 47 and 48 are for cold junction compensation (with 38 and 47
chassis GND). Connect CJC1 to terminal 5 or 21; CJC2 to terminal 12 or 29.
2
Terminals 16, 33 and 40 thru 45 are chassis ground.
+
-
mV
1
2
1
3
2
1
1a
2
2a
1
2
1
2
2-wire
3-wire
4-wire
Thermocouple
RTD
Millivolt
!
ATTENTION: Total current draw through the terminal
base unit is limited to 10A. Separate power connections to
the terminal base unit may be necessary.
