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Chapter 5
Calibrate Your Module
Use precision resistors -
for 383 and 100 calibration
Use precision voltage source –
for offset and gain calibration
Precision voltage source
RTD
4-wire
Millivolt
1
+
mV
-
2
36
To calibrate the module manually:
1. Apply a reference to the desired inputs.
2. Send a message to the module to indicate which inputs to read and what calibration step is
being performed (offset).
The module returns a response which echoes the message sent to the module. The module
stores this input data.
3. Apply a second reference signal to the module.
4. Send a second message to indicate which inputs to read and what calibration step is being
performed (gain).
The module computes the new calibration values for the inputs and returns a response
which echoes back the message sent to the module. If the calibration cannot be completed,
the module returns a fault message.
Calibration Setup
0
0
16
34
0
0
+
-
16
17
34
Connect + to terminals 2, 6, 10, 14, 19, 23, 27, and 31
Connect - to terminals 3, 7, 11, 15, 20, 24, 28 and 32
Connect one 10 k, 0.5% resistor across terminals 37 and 39 and another across 46 and 48.
Table 11 - Wiring Connections for Calibrating the Thermocouple and RTD Input Module
Type of Input
RTD – 4-wire
Millivolt
1
W
Table 12 - Wiring to the 1794-TB3G and 1794-TB3GS Terminal Base Units
1a
2a
RTD or
2
Thermocouple
Channel
0
1
2
3
4
5
Rockwell Automation Publication 1794-UM012D-EN-P - March 2023
2
4
5
6
7
1
3
1
2
3
4
5
6
7
17
18
19
20
21
22
23
35
36
37
38
39
40
41
1
2
3
4
5
6
7
1
2
3
4
5
6
7
18
19
20
21
22
23
24
35
36
37
38
39
40
41
Connect the Following:
H
L
1a
2a
1
1794-TB3G and 1794-TB3GS Terminal Base Units
High Signal Terminal (H) Low Signal Terminal (L) RTD Source Current (+) Signal Return (-)
1
2
5
6
9
10
13
14
18
19
22
23
8
9
10
11
12
13 14
8
9
10
11
12
13
14
24
25
26
27
28
29
30
31
42
43
44
45
46
47
48
8
9
10
11
12
13
14
8
9
10
11
12
13
14
25
26
27
28
29
30
31
42
43
44
45
46
47
48
1794-TB3G
+
-
1
2
2
(1)
0
4
8
12
17
21
15
15
32
33
49
50
51
15
15
32
33
49
50
51
Shield
3
7
11
15
20
24
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