Rockwell Automation 1794-OB8, 1794-OB16P, 1794-OB8EP, 1794-OB16, 1794-OB32P Installation Instructions Manual

Installation Instructions

FLEX I/O Digital DC Output Modules

Catalog numbers 1794-OB8, 1794-OB8EP, 1794-OB16,
1794-OB16P, 1794-OB32P

Table of Contents

Topic Page

Important User Information 2

Environment and Enclosure 3

Preventing Electrostatic Discharge 3

European Hazardous Location Approval 3

North American Hazardous Location Approval 7

Install Your FLEX I/O AC Digital Output Module 8

Connect Wiring for 1794-OB8, 1794-OB8EP, 1794-OB16, and 1794-OB16P 9

Connect Wiring for the 1794-OB32P 11

Configuring your 1794-OB8EP Output Module 14

Configure the 1794-OB8, 1794-OB16, 1794-OB16P, 1794-OB32P Modules 15

Specifications 16

2 FLEX I/O Digital DC Output Modules

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

http://www.rockwellautomation.com/literature/

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.

available from your local Rockwell Automation Sales Office or online at

) describes some important differences between solid

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, and recognize the consequences.

IMPORTANT Identifies information that is critical for successful application and understanding of

the product.

Publication 1794-IN094D-EN-P - July 2018

Environment and Enclosure

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.

FLEX I/O Digital DC Output Modules 3

In addition to this publication, see the following:

• Industrial Automation Wiring and Grounding Guidelines, publication

1770-4.1

• NEMA Standard 250 and EN/IEC 60529, as applicable, for explanations of
the degrees of protection provided by enclosures.

, for more installation requirements.

Preventing Electrostatic Discharge

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.

Publication 1794-IN094D-EN-P - July 2018

4 FLEX I/O Digital DC Output Modules

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

ATTENTION: If this equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.

, 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: 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.

Publication 1794-IN094D-EN-P - July 2018

FLEX I/O Digital DC Output Modules 5

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.

At the end of its life, this equipment should be collected separately from any
unsorted municipal waste.

Publication 1794-IN094D-EN-P - July 2018

6 FLEX I/O Digital DC Output Modules

European Hazardous Location Approval

Approved for 1794-OB8, 1794-OB8EP, 1794-OB16 and 1794-OB16P modules..

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

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.

for details.

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.

Publication 1794-IN094D-EN-P - July 2018

FLEX I/O Digital DC Output Modules 7

North American Hazardous Location Approval

The 1794-OB8, 1794-OB8EP, 1794-OB16, 1794-OB16P module is Hazardous Location approved:

The following information applies when
operating this equipment in hazardous 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.

WARNING:
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.

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.

WARNING:
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.

• LLa substitution de composants peut rendre
cet équipement inadapté à une utilisation en
environnement de Classe I, Division 2.

Publication 1794-IN094D-EN-P - July 2018

8 FLEX I/O Digital DC Output Modules

6

1

7

5

4

3

2

6

Install Your FLEX I/O AC Digital Output Module

Description Description

1 Flexbus connector 5 Groove

2 Latching mechanism 6 Alignment bar

3 Keyswitch 7 Module

4 Terminal base

The module mounts on a 1794 terminal base.

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/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.

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.

Publication 1794-IN094D-EN-P - July 2018