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Rockwell Automation Publication 1794-IN092F-EN-P - November 2021
FLEX I/O Terminal Base Units Installation Instructions
Wire Connections
Wire Connections for 1794-TB32, 1794-TB32K, 1794-TB32S, 1794-TB32SK Terminal Bases
Wire Connections for 1794-TB2, 1794-TB2K, 1794-TB3, 1794-TB3K, 1794-TB3S, 1794-TB3S Terminal Bases
Wire Connections for 1794-TB3G, 1794-TB3GK, 1794-TB3GS, 1794-TB3GSK Terminal Bases
Wire Connections for 1794-TB3G, 1794-TB3GK, 1794-TB3GS, 1794-TB3GSK Terminal Bases
NC
Inputs/Outputs
Inputs/Outputs
+V1 COM1
+V1 COM1
+V1 C OM1
+V1 COM1
+V2 COM2
+V2 COM2
+V2 COM2
+V2 COM2
NC
NC
NC
A
B
C
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
1794-TB32 shown
+V1 = Terminals 35, 37, 39, 41
+V2 = Terminals 43, 45, 47, 49
COM1 = Terminals 36, 38, 40, 42
COM2 = Terminals 44, 46, 48, 50
NC = No connections (terminals 16, 33, 34, 51)
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
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
34
Inputs
Commons
-V
Voltage
In +V
Voltage
Out +V
Voltage
Terminals 35… 50 not available on 1794-TB2
A
B
C
Common
-V
Common
1794-TB3 shown
-V (Common) = Terminals B-16 and B-33
+V (Voltage In) = Terminals C-34 and C-51
For daisy-chaining: Supply in - C-34 (+) and B-16 (-)
Supply out - C-51 (+) and B-33 (-)
Inputs/Outputs
Inputs/Outputs
Chassis
Ground
Chassis
Ground
+V
COM
24V DC
Supply In
+V
COM
24V DC
Supply Out
Chassis Grounds for Shields
Chassis
Ground
Chassis
Ground
I/O
I/O
NC
NC
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
A
B
C
1794-TB3G shown
+24V DC = Terminals C-34, C-50
COM = C-35, C-51
Chassis Ground = Terminals B-16, B-33, C-38, C-40...45, C-47
NC = No connection
For daisy chaining: Supply in - C-34 (+), C-35 (-)
Supply out - C-50 (+) and C-51 (-)
16
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
51
33
34
+V
COM
+V
COM
B
C
Even Numbered I/O Terminals 0 to 14
Odd Numbered I/O Terminals 1 to 15
1794-TBN shown
+V = Terminals C-34, C-51
COM (-V) = Terminals B-16, B-33
