Allen-Bradley 1794-OW8 Installation Instructions

FLEX I/O 8 Relay Output Module

Cat. No. 1794-OW8, 1794-OW8K, 1794-OW8XT

(Modules with a K in the last position of the catalog number 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 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.literature.rockwellautomation.com) 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.

Identifies information about practices or circumstances that can cause an

WARNING

explosion in a hazardous environment, which may lead to personal injury or

death, property damage, or economic loss.

Identifies information that is critical for successful application and understanding

IMPORTANT

of the product.

Identifies information about practices or circumstances that can lead to personal

ATTENTION

injury or death, property damage, or economic loss. Attentions help you identify a

hazard, avoid a hazard, or recognize the consequence

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 IEC 60664-1),

at altitudes up to 2000 m (6562 ft) without derating.

This equipment is considered Group 1, Class A industrial equipment according

to IEC/CISPR 11. Without appropriate precautions, there may be difficulties with

electromagnetic compatibility in residential and other environments due to

conducted and radiated disturbances.

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 enclosure must have suitable

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. Subsequent sections of this publication may contain additional

information regarding specific enclosure type ratings that are required to comply

with certain product safety certifications.

In addition to this publication, see:

• Industrial Automation Wiring and Grounding Guidelines, for additional

installation requirements, Allen-Bradley publication 1770-4.1.

• NEMA Standards 250 and IEC 60529, as applicable, for explanations of

the degrees of protection provided by different types of enclosure.

When you insert or remove the module while backplane power is on, an

WARNING

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.

FLEX I/O is grounded through the DIN rail to chassis ground. Use zinc plated

ATTENTION

yellow-chromate 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.