Rockwell Automation 1794-OA8, 1794-OA8K, 1794-OA8I, 1794-OA16 User Manual

Installation Instructions

WARNING

IMPORTANT

ATTENTION

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AVERTISSEMENT

FLEX I/O AC Digital Output Modules

Cat. No. 1794-OA8, 1794-OA8K, 1794-OA8I, 1794-OA16

(Modules with catalog numbers that end in K are conformally coated to meet
noxious gas requirements of ISA/ANSI-71.040-1985 Class G3 Environment.)

Important User Information

Solid state equipment has operational characteristics diff ering from those of electromechanical equipment.
Safety Guidelines for the Application, Installation and Maintenan ce of Solid State Controls (Publication

SGI-1.1 available from your local Rockwell Automation sales office or online at
http://www.literature.rockwellautomation.com) describes some important differen ces between solid state

equipment and hard-wired electromechanica l devices. Because of this difference, and also because of the
wide variety of uses for solid state equipme nt, all persons responsible for applying this equipment must
satisfy themselves that each intended application of t his 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 a ny particular installation, Rockwell Automation, Inc. cannot
assume responsibility or liability for actual use based o n the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of informat ion, circuits,
equipment, or software described in this manua l.

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 awar e of safety considerations.

Identifies information about practices or circumstances t hat can cause an explosion in
a hazardous environment, which m ay lead to personal injury or death, property
damage, or economic loss.

Identifies information that is critical for successful application and understanding of
the product.

Identifies information about practices or circumstances that can lead to personal
injury or death, property damage, or eco nomic loss. Attentions help you identify a
hazard, avoid a hazard, or recognize the con sequence

Environment and Enclosure

This equipment is intended for use in a Pollution Degree 2 industrial environment, in
overvoltage Category II applications (as d efined in IEC 60664-1), at altitudes up to 2000
m (6562 ft) without derating.

This equipment is considered Group 1, Class A ind ustrial equipment according to
IEC/CISPR 11. Without appropriate precaution s, there may be difficulties with
electromagnetic compatibility in residential and other environments due to co nducted
and radiated disturbances.

This equipment is supplied as open-ty pe equipment. It must be mounted within an
enclosure that is suitably designed for those specific environmental conditions that
will be present and appropriately de signed to prevent personal injury resulting from
accessibility to live parts. The enclosure must have suitab le flame-retardant properties
to prevent or minimize the spread of flame, complying with a flame spread rating of
5VA, V2, V1, V0 (or equivalent) if non-metallic. The interior of the enclosure must be
accessible only by the use of a tool. Subsequ ent sections of this publication may
contain additional information reg arding specific enclosure type ratings that are
required to comply with certain product safety certifications.

In addition to this publication, see:

• Industrial Automation Wiring and Gro unding Guidelines, publication 1770-4.1,
for additional installation requirement s

• NEMA Standard 250 and IEC 60529, as appli cable, for explanations of the
degrees of protection provided by en closures

Do not remove or replace a term inal base unit while power is applied. Interruption of
the backplane can result in uninten tional operation or machine motion.

This product is grounded through the DIN rail to chassis ground. Use zinc plated
yellow-chromate steel DIN rail to assure proper grounding. The use of other DIN rail
materials (for example, aluminum or pla stic) that can corrode, oxidize, or are poor
conductors, can result in improper or i ntermittent grounding. Secure DIN rail to
mounting surface approximately every 200 mm (7.8 in.) a nd use end-anchors
appropriately.

For Class I Division 2 applications, use only Class I Division 2 listed or recog nized
accessories and modules approved for used within the 1794 platform.

North American Hazardous Location Approval

The following output modules are North American Hazardous Location approved:
1794-OA8, 1794-OA8K, 1794-OA8I and 1794-OA16.

The following information applies when operating this
equipment in hazardou s locations:

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.

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.

Informations sur l’utilisation de cet équipement en
environnements dangereux :

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.

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.

European Hazardous Location Approval

The following module is European Zone 2 approved: 1794-OA8K.

The following applies when the product bears the Ex Marking:

This equipment is intended for use in pot entially explosive atmospheres as defined by European Union
Directive 94/9/EC and has been found to comply with the Essential Health and Safety Requirements relating
to the design and construction of Cat egory 3 equipment intended for use in Zone 2 potentially explosive
atmospheres, given in Annex II to this Directive.

Compliance with the Essential Health and Saf ety Requirements has been assured by compliance with EN
60079-15 and EN 60079-0.

If you connect or disconnect wiring while the f ield side power is on, an electrical arc
can occur. This could cause an explosion in hazardous location installat ions. Be sure
that power is removed or the area is n onhazardous before proceeding.

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IMPORTANT

ATTENTION

Observe the following additional Zone 2 certification
requirements.

• This equipment is not resistant to sunlight o r other sources of UV
radiation.

• This equipment must be installed in an enclosure providing at least
IP54 protection when applied in Zone 2 e nvironments.

• This equipment shall be used within its specified rat ings defined by
Rockwell Automation.

• Provision shall be made to prevent the rated voltage from being
exceeded by transient disturbances of more th an 40% when
applied in Zone 2 environments.

• This equipment must be used only wi th ATEX certified
Rockwell Automation terminal bases.

• Secure any external connections that mate to this equipment by
using screws, sliding latches, threaded connecto rs, or other means
provided with this product.

• Do not disconnect equipment unless power h as been removed or
the area is known to be nonhazardous.

Prevent Electrostatic Discharge

This equipment is sensitive to electrostatic disch arge, which can cause
internal damage and affect normal o peration. 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 compon ent boards.

• Do not touch circuit components inside the e quipment.

• Use a static-safe workstation, if available.

• Store the equipment in appropriate static-safe packaging when not
in use.

Install Your FLEX I/O AC Digital Output Module

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 and 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 table, Wiring Connections for the 1794-OA8 and 1794-OA8K.
For 1794-TBN or 1794-TBNF: Connect individual output wiring to even
numbered terminals on the 16…33 row (B) as indicated in the table below.

2. 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 table below; 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 table
below. (The odd numbered terminals of row (C) are internally connected
together to V AC L2 common.)

3. Connect V AC power L1 to terminal 34 on the 34…51 row (C).

4.

Connect V AC common L2 to terminal 16 on the 16…33 row (B).

5. 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 ter minal 34 on the
next base unit.

6. 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.

Total current draw through terminal base connection is limited to 10A. Separate power
connections to each terminal base may be necessary.

The module mounts on a 1794 terminal base.

1794-TBNF and 1794-TBNFK are not approved f or Class I Division 2
Applications.

1. Rotate the keyswitch (3) on the terminal base (4) clockwise to position 8 as
required for this type of module.

2. Make certain 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.

If you insert or remove the module while backplane power is on , an
electrical arc can occur. This could cause an explosion in hazardous location
installations. Be sure that power is rem oved or the area is nonhazardous
before proceeding.

4. Position the module (7) with its alignment bar (6) aligned with the groove
(5) on the terminal base.

If multiple power sources are used for 1794-OA8I, do n ot exceed the specified isolation
voltage.

Wiring Connections for the 1794-OA8 and 1794-OA8K

(1)

Output

0 A-0 A-1/B-17 B-0 C-1

1 A-2 A-3/B-19 B-2

2 A-4 A-5/B-21 B-4

3 A-6 A-7/B-23 B-6

4 A-8 A-9/B-25 B-8

5 A-10 A-11/B-27 B-10

6 A-12 A-13/B-29 B-12

7 A-14 A-15/B-31 B-14

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)

(1)

(2)

1794-TB2, 1794-TB3, 1794-TB3S 1794-TBN, 1794-TBNF

Output Terminal Common

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).

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).

Terminal (L2)

Output Terminal Common

(1)

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

Terminal (L2)

C-3

C-5

C-7

C-9

C-11

C-13

C-15

(2)

Publication 1794-IN103B-EN-P - May 2011