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Overview
The FLEX™ I/O Digital DC Output module mounts on a 1794 terminal base.
Description
1
Flexbus connectors
2
Latching mechanism
3
Keyswitch
4
Terminal base
Install Your Module
ATTENTION: During mounting of all devices, be sure that all debris (metal chips, wire strands, and so on) is kept from falling into the module. Debris
that falls into the module could cause damage on power-up.
1.
Rotate the keyswitch (3) on the terminal base (4) clockwise to position 2 as required for this type of module.
2.
Make sure the Flexbus connector (1) is pushed all the way to the left to connect with the neighboring terminal base or adapter. You cannot install the module
unless the connector is fully extended.
3.
Make sure the pins on the bottom of the module are straight so they align properly with the connector in the terminal base.
4.
Position the module (7) with its alignment bar (6) aligned with the groove (5) on the terminal base.
5.
Press firmly and evenly to seat the module in the terminal base unit. The module is seated when the latching mechanism (2) is locked into the module.
Connect Wiring for 1794-OB8, 1794-OB8EP, 1794-OB16, and 1794-OB16P
1.
Connect individual output wiring to numbered terminals on the 0...15 row (A) as indicated in
1794-OB8 – Terminals 0...7; 1794-OB16 and 1794-OB16P – terminals 0...15; 1794-OB8EP – even numbered terminals 0...14.
2.
Connect the associated -V output common to the corresponding terminal on the 16...33 row (B) for each output as indicated
connected together.
1794-OB8EP – connect associated output common to odd-numbered terminals on row A or associated terminals on row (B).
3.
Connect +V DC power to terminal 34 on the 34...51 row (C).
4.
Connect DC common to terminal 16 on the 16...33 row (B).
5.
If daisy chaining power to the next terminal base, connect a jumper from terminal 51 (+V DC) on this base unit to terminal 34 on the next base unit.
6.
If continuing DC common to the next base unit, connect a jumper from terminal 33 (common) on this base unit to terminal 16 on the next base unit.
Figure 1 - Connect Wiring for 1794-TB2, 1794-TB3, and 1794-TB3S
Connect -V (Supply Common) to terminal B-16.
Use B-33 and C-51 for daisy chaining to next terminal base unit.
Total current draw through the terminal base is limited to 10 A.
Separate power connections to each terminal base may be necessary.
1
7
0
17
16
-V
Common
34
Voltage
In +V
Rockwell Automation Publication 1794-IN094F-EN-P - July 2023
FLEX I/O Digital DC Output Modules Installation Instructions
2
3
4
5
6
Description
5
Groove
6
Alignment bar
7
Module
Table
1.
Outputs
1
2
3
4
5
6
7
8
9
10
18
19
20
21
22
23
24
25
26
27
Commons
35
36
37
38
39
40
41
42
43
44
Terminals 35...50 not available on 1794-TB2
Voltage
inTable
1. Commons are internally
11
12
13
14
15
A
28
29
30
31
32
33
B
-V
Common
45
46
47
48
49
50
51
C
Voltage
Out +V
(1794-TB3 shown)
5
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