Calibration setups, Wiring connections for the thermocouple module, Using a precision voltage source – Rockwell Automation 1794-IT8,D17946.5.7 Thermocouple/Millivolt Input Module User Manual
Page 47
6–5
Calibrating Your Module
Publication 1794-6.5.7 – April 1997
Calibration Setups
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
10
11
12
13 14
15
0
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
34
1794-TB2, -TB3
0 –15
34–51
16–33
A
B
C
Precision Voltage Source
Using a Precision Voltage Source
CJC
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
10
11
12
13 14
15
0
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
34
1794-TB3T
0 –15
34–51
16–33
A
B
C
Precision Voltage Source
CJC
CJC
Note 2: CJC not required if using thermocouple for resistance only.
Note: Use 1794-TB2 and -TB3 terminal base units for millivolt inputs only.
These terminals not on 1794-TB2
Wiring Connections for the Thermocouple Module
Thermocouple
1794-TB2, -TB3 Terminal Base Units
1794-TB3T Terminal Base Unit
2
Thermocouple
Channel
High Signal
Terminal (+)
Low Signal
Terminal (–)
Shield
Return
High Signal
Terminal (+)
Low Signal
Terminal (–)
Shield
Return
1
0
0
1
17
0
1
39
1
2
3
19
2
3
40
2
4
5
21
4
5
41
3
6
7
23
6
7
42
4
8
9
25
8
9
43
5
10
11
27
10
11
44
6
12
13
29
12
13
45
7
14
15
31
14
15
46
24V dc Common
16 thru 33
16, 17, 19, 21, 23, 25, 27, 29, 31 and 33
+24V dc power
1794-TB2 – 34 and 51; 1794-TB3 – 34 thru 51
34, 35, 50 and 51
1
Terminals 39 to 46 are chassis ground.
2
Terminals 36, 37, 38 and 47, 48, 49 are cold
junction compensator connections.