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Rockwell Automation 1794-IM8,1794-OM8 FLEX I/O 220V ac Input and Output Modules Inst. Inst. User Manual

North american hazardous location approval

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Publication 1794-IN104A-EN-P - March 2004

Installation Instructions

FLEX I/O 220V ac Digital Input and Output
Modules

Cat. No. 1794-IM8, -OM8

North American Hazardous Location Approval

The following modules are North American Hazardous Location approved:
1794-IM8 and 1794-OM8.

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.ab.com/manuals/gi) 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.

IMPORTANT

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

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

recognize the consequence

WARNING

When 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 removed or

the area is nonhazardous before proceeding.

ATTENTION

FLEX I/O 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 (e.g. aluminum,

plastic, etc.) that can corrode, oxidize, or are poor conductors, can

result in improper or intermittent grounding.

ATTENTION

Environment and Enclosure
This equipment is intended for use in a Pollution Degree 2

industrial environment, in overvoltage Category II applications

(as defined in IEC publication 60664-1), at altitudes up to 2000

meters without derating.
This equipment is considered Group 1, Class A industrial

equipment according to IEC/CISPR Publication 11. Without

appropriate precautions, there may be potential difficulties

ensuring electromagnetic compatibility in other environments

due to conducted as well as radiated disturbance.
This equipment is supplied as "open type" equipment. 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 interior of the enclosure must be

accessible only by the use of a tool. Subsequent sections of this

publication may contain additional information regarding

specific enclosure type ratings that are required to comply with

certain product safety certifications.
See NEMA Standards publication 250 and IEC publication

60529, as applicable, for explanations of the degrees of

protection provided by different types of enclosure. Also, see

the appropriate sections in this publication, as well as the

Allen-Bradley publication 1770-4.1 ("Industrial Automation

Wiring and Grounding Guidelines"), for additional installation

requirements pertaining to this equipment.

ATTENTION

Preventing Electrostatic Discharge
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.

If available, use a static-safe workstation.

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.

WARNING

AVERTISSEMENT

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