Technical data

Publication 1794-2.1 - January 2000
126 24V dc Thermocouple/RTD Input Module Cat. No. 1794-IRT8 FLEX I/O and FLEX Integra Product Data
24V dc Thermocouple/RTD Input Module Cat. No. 1794-IRT8
Wiring.
Recommended
Terminal Base
Compatible
Terminal Base(s)
1794-IRT8
T/C-RTD INPUT 8 CHANNEL
FFF F
3
FF FF
IN0 IN1 IN2 IN3
IN4 IN5 IN6 IN7
PWR
40865
TB3G TB3GS
40951
Simplified Schematic
Input Device
Shielded
Twisted Pair
Cable
3-Wire RTD Example
I
24V
Power Supply
+5V
-5V
dc/dc
Converter
MUX
Gain
Amp
V
ref
Voltage
Reference
A/D
Converter
Micro
Processor
Flexbus
Interface
+5V
+5V
+5V
+5V
A-1
A-3
+
C34
A-10
A-2
C-35
-
40620
C
onnect
i
ons
f
or
1794-TB3G shown
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
+HL-+HL-+HL-+HL-
+HL-+HL-+HL-+HL-
Chassis Gnd Chassis Gnd
Channel 0 Channel 1 Channel 2 Channel 3
Channel 4 Channel 5 Channel 6 Channel 7
+V COM
Chassis Gnd
6 Chassis Ground
for Shields
Chassis Gnd
+V COM
24V dc
Supply In
24V dc
Supply Out
CJC CJC
0-15
16-33
34-51
A
B
C