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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