Rockwell Automation 1794-OB8_OB8EP_OB16_OB16P_OB32P Flex I/O Digital DC Sourcing Output Modules Installation Instructions - Manual

Publication 1794-IN094B-EN-P - April 2004
Installation Instructions
FLEX I/O Digital dc Output Modules
1794-OB8, -OB8EP, -OB8EPK, -OB16, -OB16P,
-OB16PK, -OB32P
(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.)
European Hazardous Location Approval
The following output modules are European Zone 2
approved: 1794-OB8, -OB8EP, -OB8EPK, -OB16,
-OB16P and -OB16PK.
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.
European Zone 2 Certification
This equipment is intended for use in potentially explosive atmospheres as
defined by European Union Directive 94/9/EC.
The LCIE (Laboratoire Central des Industries Electriques) certifies that this
equipment has been found to comply with the Essential Health and Safety
Requirements relating to the design and construction of Category 3
equipment intended for use in potentially explosive atmospheres, given in
Annex II to this Directive. The examination and test results are recorded in
confidential report No. 28 682 010.
Compliance with the Essential Health and Safety Requirements has been
assured by compliance with EN 50021.