Spectrum Controls 1794sc-IRT8I User Manual page 22

2-12 Flex™ IO Isolated RTD/Thermocouple Module
User's Manual Pub. 0300242‐01 Rev. A
RTD/Resistance
2-wire
1
Jumper
0
Numbers 0, 1, 2, and 3 are wiring numbers of the
2
3-wire
sensor used. For terminal numbers corresponding to
1
R, IN+, IN-, I, refer to Terminal Base Unit Wiring
0
Connections below.
2
1
Thermocouple
+
1
2
-
mV Source
1
+
mV
-
2
Table 2-2
Input
+
CJC1 C37
CJC2 C-46
1
Terminals 37, 38, and 39, and 46, 47, and 48 are for cold junction
compensation (with 38 and 47 chassis GND). Connect the tail of CJC 1 to
terminal 1 and CJC2 to terminal 31 if channels 0...3 or 0...7 are configured
for thermocouples.
Table 2-3
1794-TB3G and 1794-TB3GS Terminal Base Units
Signal Return (R)
Channel Number
0 A-0
1 A-4
2 A-8
3 A-12
4 B-17
5 B-21
6 B-25
7 B-29
1Terminals 16, 33, and 40...45 are chassis ground.
CJC Sensor
Chassis -
Ground
C38 C39
C-47 C-48
Input +
(IN+)
A-1
A-5
A-9
A-13
B-18
B-22
B-26
B-30
CJC
1
Tail
A1
B31
Input I Return
(-) (-)
A-2 A-3
A-6 A-7
A-10 A-11
A-14 A-15
B-19 B-20
B-23 B-24
B-27 B-28
B-31 B-32