Allen-Bradley 1794-OA8K User manual

Installation Instructions
FLEX I/O AC Digital Output Modules
Catalog numbers 1794-OA8, 1794-OA8K, 1794-OA8I, 1794-OA16
Table of Contents
Topic Page
Important User Information 2
Environment and Enclosure 3
Preventing Electrostatic Discharge 3
European Hazardous Location Approval 5
North American Hazardous Location Approval 7
Install Your FLEX I/O AC Digital Output Module 8
Configure the FLEX I/O AC Output Module 15
Specifications 17

2FLEX I/O AC Digital Output Modules
Publication 1794-IN103D-EN-P - July 2018
Important User Information
Solid state equipment has operational characteristics differing from those of electromechanical
equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls
(Publication SGI-1.1 available from your local Rockwell Automation sales office or online at
http://www.rockwellautomation.com/literature/) describes some important differences between solid
state equipment and hard-wired electromechanical devices. Because of this difference, and also because
of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment
must satisfy themselves that each intended application of this equipment is acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages
resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the
many variables and requirements associated with any particular installation, Rockwell Automation, Inc.
cannot assume responsibility or liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits,
equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell
Automation, Inc. is prohibited.
Throughout this manual we use notes to make you aware of safety considerations.
WARNING: Identifies information about practices or circumstances that can cause an
explosion in a hazardous environment, which may lead to personal injury or death,
property damage, or economic loss.
ATTENTION: Identifies information about practices or circumstances that can lead to
personal injury or death, property damage, or economic loss. Attentions help you
identify a hazard, avoid a hazard, or recognize the consequence.
IMPORTANT Identifies information that is critical for successful application and understanding of
the product.

FLEX I/O AC Digital Output Modules 3
Publication 1794-IN103D-EN-P - July 2018
Environment and Enclosure
Preventing Electrostatic Discharge
ATTENTION: This equipment is intended for use in a Pollution Degree 2
industrial environment, in overvoltage Category II applications (as defined in
EN/IEC 60664-1), at altitudes up to 2000 m (6562 ft) without derating.
This equipment is not intended for use in residential environments and may not
provide adequate protection to radio communication services in such
environments.
This equipment is supplied as open-type equipment for indoor use. It must be
mounted within an enclosure that is suitably designed for those specific
environmental conditions that will be present and appropriately designed to
prevent personal injury resulting from accessibility to live parts. The enclosure
must have suitable flame-retardant properties to prevent or minimize the spread
of flame, complying with a flame spread rating of 5VA or be approved for the
application if nonmetallic. The interior of the enclosure must be accessible only
by the use of a tool. Subsequent sections of this publication may contain more
information regarding specific enclosure type ratings that are required to
comply with certain product safety certifications.
In addition to this publication, see the following:
• Industrial Automation Wiring and Grounding Guidelines, publication
1770-4.1, for more installation requirements.
• NEMA Standard 250 and EN/IEC 60529, as applicable, for explanations of
the degrees of protection provided by enclosures.
ATTENTION: This equipment is sensitive to electrostatic discharge, which can
cause internal damage and affect normal operation. Follow these guidelines
when you handle this equipment:
• Touch a grounded object to discharge potential static.
• Wear an approved grounding wriststrap.
• Do not touch connectors or pins on component boards.
• Do not touch circuit components inside the equipment.
• Use a static-safe workstation, if available.
• Store the equipment in appropriate static-safe packaging when not in use.

4FLEX I/O AC Digital Output Modules
Publication 1794-IN103D-EN-P - July 2018
ATTENTION: This product is grounded through the DIN rail to chassis ground.
Use zinc plated chromate-passivated steel DIN rail to assure proper grounding.
The use of other DIN rail materials (for example, aluminum or plastic) that can
corrode, oxidize, or are poor conductors, can result in improper or intermittent
grounding. Secure DIN rail to mounting surface approximately every 200 mm
(7.8 in.) and use end-anchors appropriately. Be sure to ground the DIN rail
properly.
Refer to Industrial Automation Wiring and Grounding Guidelines, Rockwell
Automation publication 1770-4.1, for more information
ATTENTION: If this equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.
ATTENTION: If this equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.
ATTENTION: Read this document and the documents listed in the Additional
Resources section about installation, configuration, and operation of this
equipment before you install, configure, operate, or maintain this product.
Users are required to familiarize themselves with installation and wiring
instructions in addition to requirements of all applicable codes, laws, and
standards.
ATTENTION: Installation, adjustments, putting into service, use, assembly,
disassembly, and maintenance are required to be carried out by suitably
trained personnel in accordance with applicable code of practice.
In case of malfunction or damage, no attempts at repair should be made. The
module should be returned to the manufacturer for repair.
Do not dismantle the module.
ATTENTION: Use only a soft dry anti-static cloth to wipe down equipment. Do
not use any cleaning agents.

FLEX I/O AC Digital Output Modules 5
Publication 1794-IN103D-EN-P - July 2018
European Hazardous Location Approval
Approved for the 1794-OA8K module only.
WARNING: When you insert or remove the module while backplane power
is on, an electric arc can occur. This could cause an explosion in hazardous
location installations.
Be sure that power is removed or the area is nonhazardous before
proceeding. Repeated electric arcing causes excessive wear to contacts on
both the module and its mating connector. Worn contacts may create
electrical resistance that can affect module operation.
WARNING: If you insert or remove the module while backplane power is on,
an electric arc can occur. This could cause an explosion in hazardous location
installations.
Be sure that power is removed or the area is nonhazardous before
proceeding.
The following applies to products marked II 3 G:
Are Equipment Group II, Equipment Category 3, and comply with the Essential Health and
Safety Requirements relating to the design and construction of such equipment given in
Annex II to EU Directive 2014/34/EU. See the EU Declaration of Conformity at
http://www.rockwellautomation.com/global/certification/overview.page for details. The
type of protection is II 3G Ex nA IIC T3 Gc according to EN 60079-15.
Comply to Standards EN 60079-0:2012, EN 60079-15:2010, reference certificate number
LCIE 01 ATEX 6020 X.
Are intended for use in areas in which explosive atmospheres caused by gases, vapors,
mists, or air are unlikely to occur, or are likely to occur only infrequently and for short
periods. Such locations correspond to Zone 2 classification according to ATEX directive
2014/34/EU.

6FLEX I/O AC Digital Output Modules
Publication 1794-IN103D-EN-P - July 2018
WARNING: Observe the following additional certification
requirements:
• This equipment is not resistant to sunlight or other sources of UV
radiation.
• This equipment shall be mounted in an ATEX/IECEx Zone 2 certified
enclosure with a minimum ingress protection rating of at least IP54 (in
accordance with EN/IEC 60079-15) and used in an environment of not
more than Pollution Degree 2 (as defined in EN/IEC 60664-1) when
applied in Zone 2 environments. The enclosure must be accessible only
by the use of a tool.
• This equipment shall be used within its specified ratings defined by
Rockwell Automation.
• The instructions in the user manual shall be observed.
• This equipment must be used only with ATEX certified Rockwell
Automation backplanes.
• Earthing is accomplished through mounting of modules on rail.
• Devices shall be used in an environment of not more than Pollution
Degree 2.
• Enclosure must be marked with the following: "Warning - Do not open
when energized." After installation of equipment into the enclosure,
access to termination compartments shall be dimensioned so that
conductors can be readily connected.

FLEX I/O AC Digital Output Modules 7
Publication 1794-IN103D-EN-P - July 2018
North American Hazardous Location Approval
The following modules are North American Hazardous Location approved: 1794-OA8,
1794-OA8K, 1794-OA8I, 1794-OA16.
The following information applies when
operating this equipment in hazardous
locations:
Informations sur l’utilisation de cet
équipement en environnements dangereux:
Products marked "CL I, DIV 2, GP A, B, C, D" are suitable for
use in Class I Division 2 Groups A, B, C, D, Hazardous
Locations and nonhazardous locations only. Each product is
supplied with markings on the rating nameplate indicating
the hazardous location temperature code. When combining
products within a system, the most adverse temperature code
(lowest "T" number) may be used to help determine the
overall temperature code of the system. Combinations of
equipment in your system are subject to investigation by the
local Authority Having Jurisdiction at the time of installation.
Les produits marqués "CL I, DIV 2, GP A, B, C, D" ne
conviennent qu'à une utilisation en environnements de
Classe I Division 2 Groupes A, B, C, D dangereux et non
dangereux. Chaque produit est livré avec des marquages
sur sa plaque d'identification qui indiquent le code de
température pour les environnements dangereux. Lorsque
plusieurs produits sont combinés dans un système, le code
de température le plus défavorable (code de température le
plus faible) peut être utilisé pour déterminer le code de
température global du système. Les combinaisons
d'équipements dans le système sont sujettes à inspection
par les autorités locales qualifiées au moment de
l'installation.
EXPLOSION HAZARD
• Do not disconnect equipment unless power
has been removed or the area is known to be
nonhazardous.
• Do not disconnect connections to this
equipment unless power has been removed
or the area is known to be nonhazardous.
Secure any external connections that mate
to this equipment by using screws, sliding
latches, threaded connectors, or other
means provided with this product.
• Substitution of components may impair
suitability for Class I, Division 2.
• If this product contains batteries, they must
only be changed in an area known to be
nonhazardous.
RISQUE D’EXPLOSION
• Couper le courant ou s'assurer que
l'environnement est classé non dangereux
avant de débrancher l'équipement.
• Couper le courant ou s'assurer que
l'environnement est classé non dangereux
avant de débrancher les connecteurs.
Fixer tous les connecteurs externes reliés
à cet équipement à l'aide de vis, loquets
coulissants, connecteurs filetés ou autres
moyens fournis avec ce produit.
• La substitution de composants peut
rendre cet équipement inadapté à une
utilisation en environnement de Classe I,
Division 2.
• S'assurer que l'environnement est classé
non dangereux avant de changer les piles.

8FLEX I/O AC Digital Output Modules
Publication 1794-IN103D-EN-P - July 2018
Install Your FLEX I/O AC Digital Output Module
The module mounts on a 1794 terminal base.
1. Rotate the keyswitch (3) on the terminal base (4) clockwise to position 8as
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/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 will 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.
Description Description
1 Flexbus connector 5 Groove
2 Latching mechanism 6 Alignment bar
3 Keyswitch 7 Module
4 Terminal base
WARNING: 1794-TBNF and 1794-TBNFK are not approved for Class I
Division 2 Applications.
2
3
4
5
6
7
1
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FLEX I/O AC Digital Output Modules 9
Publication 1794-IN103D-EN-P - July 2018
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.
Connecting Wiring for the 1794-OA8 or 1794-OA8K
1. For 1794-TB2, 1794-TB3, or 1794-TB3S – Connect individual output wiring
to even numbered terminals on the 0…15 row (A) as indicated in the Wiring
Connections for 1794-OA8 and 1794-OA8K table.
2. For 1794-TBN or 1794-TBNF – Connect individual output wiring to even
numbered terminals on the 16…33 row (B) as indicated in the Wiring
Connections for 1794-OA8 and 1794-OA8K table.
3. For 1794-TB2, 1794-TB3, or 1794-TB3S – Connect the associated V AC
common (L2) lead of the output device to the corresponding odd numbered
terminal on the 0…15 row (A) for each output as indicated in the Wiring
Connections for 1794-OA8 and 1794-OA8K table; or to the corresponding
terminal on the 16…33 row (B). The V AC common (L2) terminals of row (B)
and the odd numbered terminals of row (A) are internally connected together.
For 1794-TBN or 1794-TBNF – Connect the associated V AC common (L2)
lead of the output device to the corresponding odd numbered terminal on the
34…51 row (C) for each output as indicated in the Wiring Connections for
1794-OA8 and 1794-OA8K table. The odd numbered terminals of row (C) are
internally connected together to V AC L2 common.
4. Connect V AC power L1 to terminal 34 on the 34…51 row (C).
5. Connect V AC common L2 to terminal 16 on the 16…33 row (B).
6. If daisychaining V AC power (L1) to the next terminal base, connect a jumper
from terminal 51 (V AC L1) on this base unit to terminal 34 on the next base
unit.
7. If continuing V AC common (L2) to the next base unit, connect a jumper from
terminal 33 (V common L2) on this base unit to terminal 16 on the next base
unit.
IMPORTANT
Total current draw through terminal base connection is limited to 10 A.
Separate power connections to each terminal base may be necessary.
ATTENTION: If multiple power sources are used for 1794-OA8I, do not exceed
the specified isolation voltage.

10 FLEX I/O AC Digital Output Modules
Publication 1794-IN103D-EN-P - July 2018
1794-TB2, 1794-TB3, and 1794-TB3S Terminal Base Wiring for 1794-OA8
Wiring Connections for 1794-OA8 and 1794-OA8K
1794-TB2, 1794-TB3, 1794-TB3S 1794-TBN, 1794-TBNF
Output(1) Output Terminal Common
Terminal (L2)(1)
(1) A-1, 3, 5, 7, 9, 11, 13, and 15 on the 1794-TB2, 1794-TB3, and 1794-TB3S are internally connected in the module to 120V
AC common (L2).
Output Terminal Common
Terminal (L2)(2)
(2) C-1, 3, 5, 7, 9, 11, 13, and 15 on the 1794-TBN and 1794-TBNF are internally connected in the module to 120V AC
common (L2).
0 A-0 A-1/B-17 B-0 C-1
1 A-2 A-3/B-19 B-2 C-3
2 A-4 A-5/B-21 B-4 C-5
3 A-6 A-7/B-23 B-6 C-7
4 A-8 A-9/B-25 B-8 C-9
5 A-10 A-11/B-27 B-10 C-11
6 A-12 A-13/B-29 B-12 C-13
7 A-14 A-15/B-31 B-14 C-15
A = Output terminals (Even numbered terminals 0...14)
B = Common terminals
C = Power terminals (C-34 and C-51 on 1794-TB2;
C-34...C-51 on 1794-TB3 and 1794-TB3S)
B = Even numbered output terminals 0...14,
AC common terminals 16 and 33
C = Power terminals C-34 and C-51, and odd
numbered output terminals 1...15
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
Commons
(1794-TB3 shown)
Connect 120VAC common L2 to terminal B-16.
Connect 120VAC power L1 to terminal C-34.
L2 IN L2 OUT
Voltage
A
B
C
(Use B-33 and C-51 for daisy-chaining power to the next terminal base unit.)
L1 IN L1 OUT
(Terminals C-35…C-50 are not present on the 1794-TB2.)
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FLEX I/O AC Digital Output Modules 11
Publication 1794-IN103D-EN-P - July 2018
1794-TBN and 1794-TBNF Terminal Base Wiring for 1794-OA8
Connect Wiring for the 1794-OA8I
1. For 1794-TB2, 1794-TB3, or 1794-TB3S – Connect individual output wiring
to the even numbered terminals on the 0…15 row (A).
For 1794-TBN or 1794-TBNF – Connect individual output wiring to the even
numbered terminals on the 16…33 row (B).
2. For 1794-TB2, 1794-TB3, or 1794-TB3S – Connect the associated V AC
power lead (L1) to the corresponding odd numbered terminal on the 0…15 row
(A) for each output as indicated in the Wiring Connections for 1794-OA8I
table.
For 1794-TBN or 1794-TBNF – Connect the associated VAC power (L1) lead
to the odd numbered terminals on row (C).
IMPORTANT
Individual isolated 120V AC common (L2) leads must be run externally to
each output device.
WARNING: When used in a Class I, Division 2, hazardous location, this
equipment must be mounted in a suitable enclosure with proper wiring
method that complies with the governing electrical codes.
16 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 51
33
34
B
C
Even Numbered I/O Terminals 0…14
Odd Numbered I/O Terminals 1…15
Connect 120VAC (L2) to terminal B-16
Connect 120VAC power (L1) to terminal C-34
Use B-33 and C-51 for daisychaining to the next terminal base
L1
L2
L1
L2
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12 FLEX I/O AC Digital Output Modules
Publication 1794-IN103D-EN-P - July 2018
1794-TB2, 1794-TB3, and 1794-TB3S Terminal Base Wiring for 1794-OA8I
Wiring Connections for 1794-OA8I
1794-TB2, 1794-TB3, 1794-TB3S 1794-TBN, 1794-TBNF
Output(1) Output Terminal 120V AC
Supply(1)
(1) A = Even numbered terminals 0…14 for customer connections; corresponding odd numbered 120V AC supply L1
terminals 1…15 for customer connections from isolated power supply.
Output
Terminal
120V AC
Supply(2)
(2) B = Even numbered terminals 0…14 for customer connections; C = Odd numbered 120V AC supply L1 terminals 1…15
for customer connections from isolated power supply.
0 A-0 A-1 B-0 C-1
1 A-2 A-3 B-2 C-3
2 A-4 A-5 B-4 C-5
3 A-6 A-7 B-6 C-7
4 A-8 A-9 B-8 C-9
5 A-10 A-11 B-10 C-11
6 A-12 A-13 B-12 C-13
7 A-14 A-15 B-14 C-15
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
A
B
C
(1794-TB3 shown)
Connect outputs to even numbered terminals on row (A)
Connect isolated 120VAC (L1) to odd numbered terminals on row (A)
Individual isolated 120VAC common (L2) must be run externally to each of the output devices
(Terminals C-35…C-50 are not available on the 1794-TB2.)
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FLEX I/O AC Digital Output Modules 13
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1794-TBN and 1794-TBNF Terminal Base Wiring for 1794-OA8I
Connect Wiring for the 1794-OA16
1. For 1794-TB2, 1794-TB3, or 1794-TB3S – Connect individual output wiring
to numbered terminals on the 0…15 row (A) as indicated in the Wiring
Connections for 1794-OA16 table.
For 1794-TBN – Connect individual output wiring to terminals 0…15 on rows
B and C.
2. For 1794-TB2, 1794-TB3, or 1794-TB3S – Connect the associated VAC
common (L2) lead of the output device to the corresponding numbered terminal
on the 16…33 row (B) for each output as indicated in the Wiring Connections
for 1794-OA16 table. The V AC common terminals of row (B) are internally
connected together.
For 1794-TBN – Auxiliary terminal blocks are required to connect the
associated L2 common for each channel. Connect the L2 side of the load together
and then connect to L2 on the power supply.
3. Connect 120V AC power L1 to terminal 34 on the 34…51 row (C).
4. Connect 120V AC common L2 to terminal 16 on the 16…33 row (B).
5. If daisychaining power to the next terminal base, connect a jumper from terminal
51 (120V AC L1) on this base unit to terminal 34 on the next base unit.
6. If continuing 120V AC common (L2) to the next base unit, connect a jumper
from terminal 33 (120V AC common L2) on this base unit to terminal 16 on the
next base unit.
IMPORTANT
Total current draw through terminal base connection is limited to 10 A.
Separate power connections to each terminal base may be necessary.
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...14
Odd Numbered I/O Terminals 1...15
Connect outputs to even numbered terminals on row (B).
Connect isolated 120V AC (L1) to odd numbered terminals on row (C).
Individual isolated 120V AC common (L2) must be run externally to each
of the output devices.
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14 FLEX I/O AC Digital Output Modules
Publication 1794-IN103D-EN-P - July 2018
At the end of its life, this equipment should be collected separately from any
unsorted municipal waste.
Wiring Connections for 1794-OA16
Output
Channel
1794-TB2, 1794-TB3, 1794-TB3S 1794-TBN
Output Terminal 120V AC Common (L2) Output Terminal(1)
(1) Auxiliary terminal blocks are required to connect the associated L2 common for each channel when using a 1794-TBN
terminal base with the 1794-OA16.
0 A-0 B-17 B-0
1 A-1 B-18 C-1
2 A-2 B-19 B-2
3 A-3 B-20 C-3
4 A-4 B-21 B-4
5 A-5 B-22 C-5
6 A-6 B-23 B-6
7 A-7 B-24 C-7
8 A-8 B-25 B-8
9 A-9 B-26 C-9
10 A-10 B-27 B-10
11 A-11 B-28 C-11
12 A-12 B-29 B-12
13 A-13 B-30 C-13
14 A-14 B-31 B-14
15 A-15 B-32 C-15
120V AC L1
power
Connect V AC L1 to C-34.
1794-TB3, 1794-TB3S – Power terminals C-34…C-51 are internally connected together.
1794-TB2 and 1794-TBN – C-34 and C-51 are internally connected together.
120V AC L2 Connect 120V AC common L2 to terminal B-16.
1794-TB3, 1794-TB3S – 120V AC common L2 terminals B-16…B-33 are internally
connected together.
1794-TB2, 1794-TBN – 120V AC common L2 terminals B-16 and B-33 internally
connected together.

FLEX I/O AC Digital Output Modules 15
Publication 1794-IN103D-EN-P - July 2018
1794-TB2, 1794-TB3, and 1794-TB3S Terminal Base Wiring for 1794-OA16
1794-TBN Terminal Base Wiring for 1794-OA16
Configure the FLEX I/O AC Output Module
Image Table Memory Map for the 1794-OA8, 1794-OA8K, and 1794-OA8I Modules
Dec 1514131211109876543210
Oct 17161514131211107 6 5 4 3 2 1 0
Read Not used – set to 0
Write Notused–setto0 O7O6O5O4O3O2O1O0
Where O = Output number
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
Commons
(1794-TB3 shown)
Connect 120VAC common L2 to terminal B-16.
Connect 120VAC power L1 to terminal C-34.
L2 IN L2 OUT
Voltage
A
B
C
(Use B-33 and C-51 for daisy-chaining power to the next terminal base unit.)
L1 IN L1 OUT
(Terminals C-35…C-50 are not present on the 1794-TB2.)
Outputs
45675
16 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 51
33
34
B
C
Even Numbered I/O Terminals 0…14
Odd Numbered I/O Terminals 1…15
Connect 120VAC (L2) to terminal B-16
Connect 120VAC power (L1) to terminal C-34
Use B-33 and C-51 for daisychaining to the next terminal base
L1
L2
L1
L2
45676

16 FLEX I/O AC Digital Output Modules
Publication 1794-IN103D-EN-P - July 2018
Image Table Memory Map for the 1794-OA16 Module
Dec 1514131211109876543210
Oct 17161514131211107 6 5 4 3 2 1 0
Read Not used – set to 0
Write O15O14O13O12O11O10O9O8O7O6O5O4O3O2O1O0
Where O = Output number

FLEX I/O AC Digital Output Modules 17
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Specifications
Specifications – 1794-OA8, 1794-OA8K, 1794-OA8I
Attribute 1794-OA8, 1794-OA8K 1794-OA8I
Number of outputs 8, nonisolated 8, isolated
Recommended terminal base unit 1794-TBN(4), 1794-TBNF, 1794-TB2, 1794-TB3, 1794-TB3S,
1794-TBKD, 1794-TBNK, 1794-TBNFK, 1794-TB3K, 1794-TB3SK
Output voltage, min 85V AC
Output voltage, nom 120V AC
Output voltage, max 132V AC
Output current rating 4.0 A (8 outputs @ 500 mA)
On-state current, min 5.0 mA per output
On-state current, max(1)
(1) Below 50 mA the voltage drop across the module will be higher and the voltage waveform may have some small
oscillation (less than 5V).
500 mA per output @ 55 °C (sufficient to operate an Allen-Bradley
Bulletin 500 NEMA size 3 motor starter)
750 mA per output @ 35 °C
1.0 A on 4 non-adjacent outputs, 500 mA on the remaining 4
outputs @ 30 °C
On-state voltage drop, max 1.0V @ 0.5 A
Surge current 7 A for 40 ms, repeatable every 8 seconds
Off-state leakage current, max 2.25 mA
Isolation voltage 120V (continuous), field to
backplane
Tested @ 1250V AC for 60 s
No isolation between individual
channels.
120V (continuous), field to
backplane, channel to channel
Tested @ 1250V AC for 60 s
Isolation between individual
channels.
Output signal delay(2)
Off to On
On to Off
1/2 cycle max
1/2 cycle max
FlexBus current 80 mA @ 5V DC
Power dissipation, max 4.1 W @ 0.5 A
6.3 W @ 0.75 A
6.3 W @ 1.0 A
Thermal dissipation, max 14.0 BTU/hr @ 0.5 A
21.2 BTU/hr @ 0.75 A
21.4 BTU/hr @ 1.0 A
Fusing(3) 1.6 A, 250V AC slow-blow, Littelfuse 23901.6; San-O SD6-1.6 (1.6
A fuses come preinstalled in 1794-TBNF terminal base units.)

18 FLEX I/O AC Digital Output Modules
Publication 1794-IN103D-EN-P - July 2018
(2) Output signal delay is the time from receipt of an output on or off command to the output actually turning on or off.
(3) Module outputs are not fused. Fusing is recommended. If fusing is desired, you must supply external fusing or use the
1794-TBNF terminal base, if recommended.
(4) Auxiliary terminal strips are required when using the 1794-TBN.
Specifications – 1794-OA16
Attribute Value
Number of outputs 16, nonisolated
Recommended terminal base unit 1794-TBN(5), 1794-TBNF, 1794-TB2, 1794-TB3, 1794-TB3S,
1794-TBKD, 1794-TBNK, 1794-TBNFK, 1794-TB3K, 1794-TB3SK
Mounting See derating curve
Output voltage range, min 74V AC
Output voltage range, nom 120V AC
Output voltage range, max 132V AC
Output current rating(1) 4.0 A (16 outputs @ 250 mA)
On-state current, min 5.0 mA per output
On-state current, max(2) 500 mA per output @ 55 °C
On-state voltage drop, max 1.5V @ 0.5 A
Surge current 7 A for 40 ms, repeatable every 8 seconds
Off-state leakage current, max 2.25 mA
Isolation voltage 120V (continuous), field to backplane
Tested @ 1250V AC for 60 s
No isolation between individual channels.
Output signal delay(3)
Off to On
On to Off
1/2 cycle max
1/2 cycle max
FlexBus current 80 mA @ 5V DC
Power dissipation, max 4.7 W @ 0.5 A
Thermal dissipation, max 16.1 BTU/hr @ 0.5 A
Fusing(4) 2.5 A, 150V AC normal blow, MQ2
(1) If using 0.5 A outputs, alternate wiring so that no two 0.5 A outputs are next to each other.
(2) Below 50 mA the voltage drop across the module will be higher and the voltage waveform may have some small
oscillation (less than 5V).
(3) Output signal delay is the time from receipt of an output on or off command to the output actually turning on or off.

FLEX I/O AC Digital Output Modules 19
Publication 1794-IN103D-EN-P - July 2018
(4) Module outputs are not fused. Fusing is recommended. If fusing is desired, you must supply external fusing or use the
1794-TBNF terminal base, if recommended.
(5) Auxiliary terminal strips are required when using the 1794-TBN.
General Specifications
Attribute Value
Terminal base screw torque Determined by installed terminal base
Dimensions, approx. (H x W x D) 94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in.)
Weight, approx. 109 g (3.84 oz) – 1794-OA8, 1794-OA8K
107 g (3.77 oz.) – 1794-OA8I
96 g (3.38 oz.) – 1794-OA16
Indicators (field side indication) 8 yellow status indicators – 1794-OA8, 1794-OA8K, 1794-OA8I
16 yellow status indicators – 1794-OA16
External AC power supply voltage 120V AC
External AC power voltage range 85...132V AC – 1794-OA8, 1794-OA8K, 1794-OA8I
74...132V AC – 1794-OA16
Keyswitch position 8
Pilot duty rating 5 A Inrush
North American temp code T4A – 1794-OA8, 1794-OA8K, 1794-OA8I
T4 – 1794-OA16
IEC temp code T4 – 1794-OA8K
Enclosure type rating None (open-style)
Wire size Determined by installed terminal base
Wiring category(1) 2 - on signal ports
(1) Use this conductor category information for planning conductor routing as described in Industrial Automation Wiring
and Grounding Guidelines, publication 1770-4.1.

20 FLEX I/O AC Digital Output Modules
Publication 1794-IN103D-EN-P - July 2018
Environmental Specifications
Attribute Value
Operating temperature IEC 60068-2-1 (Test Ad, Operating Cold),
IEC 60068-2-2 (Test Bd, Operating Dry Heat),
IEC 60068-2-14 (Test Nb, Operating Thermal Shock):
-20…55 °C (-4…131 °F) – 1794-OA8, 1794-OA8K, 1794-OA8I
0 °C < Ta < +55 °C (+32 °F < Ta < +131 °F) – 1794-OA16
Temperature, surrounding air,
max.
55 °C (131 °F)
Temperature, nonoperating IEC 60068-2-1 (Test Ab, Unpackaged Non-operating Cold),
IEC 60068-2-2 (Test Bb, Unpackaged Non-operating Dry Heat),
IEC 60068-2-14 (Test Na, Unpackaged Non-operating Thermal Shock):
-40…85 °C (-40…185 °F)
Relative humidity IEC 60068-2-30 (Test Db, Unpackaged Damp Heat):
5…95% non-condensing
Vibration IEC60068-2-6 (Test Fc, Operating):
5 g @ 10...500 Hz
Shock, operating IEC60068-2-27 (Test Ea, Unpackaged shock):
30 g
Shock, nonoperating IEC60068-2-27 (Test Ea, Unpackaged shock):
50 g
Emissions IEC 61000-6-4
ESD immunity IEC 61000-4-2:
6kV contact discharges
8 kV air discharges
Radiated RF immunity IEC 61000-4-3:
10V/m with 1 kHz sine-wave 80% AM from 80…2000 MHz
10V/m with 200 Hz 50% Pulse 100% AM @ 900 MHz
10V/m with 200 Hz 50% Pulse 100% AM @ 1890 MHz
1V/m with 1 kHz sine-wave 80% AM from 2000…2700 MHz
EFT/B immunity IEC 61000-4-4:
±2 kV @ 5 kHz on power ports
±2 kV @ 5 kHz on signal ports
Surge transient immunity IEC 61000-4-5:
±1 kV line-line(DM) and ±2 kV line-earth(CM) on signal ports
Conducted RF immunity IEC 61000-4-6:
10V rms with 1 kHz sine-wave 80% AM from 150 kHz…80 MHz