Rockwell Automation 1794-OB8EPXT, 1794-IB16XT, 1794-OB16PXT, 1794-IB10XOB6XT FLEX XT I/O Digital DC Input/Output Modules User Manual
European hazardous location approval
Publication 1794-IN124A-EN-P - January 2009
Installation Instructions
FLEX I/O Digital DC Input/Output Modules
1794-OB8EPXT, 1794-IB16XT, 1794-OB16PXT,
1794-IB10XOB6XT
(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-OB8EPXT, 1794-IB16XT, 1794-OB16PXT, 1794-IB10XOB6XT
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
ailable from your
local Rockwell Automation sales office or online at
cribes 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
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 (6562 ft)
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 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
•
NEMA Standards publication 250 and IEC publication 60529,
as applicable, for explanations of the degrees of protection
provided by different types of enclosure.
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 (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.
ATTENTION
Prevent 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.
•
Use a static-safe workstation, if available.
•
Store the equipment in appropriate static-safe packaging when
not in use.
ATTENTION
Personnel responsible for the application of safety-related
Programmable Electronic Systems (PES) shall be aware of the safety
requirements in the application of the system and shall be trained in
using the system.
ATTENTION
Do not remove or replace a Terminal Base unit while power is
applied. Interruption of the backplane can result in unintentional
operation or machine motion.
WARNING
If you connect or disconnect wiring while the field-side 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
To comply with the CE Low Voltage Directive (LVD), all connections to
this equipment must be powered from a source compliant with the
following:
Safety Extra Low Voltage (SELV) or Protected Extra Low Voltage
(PELV).
European Zone 2 Certification (The following applies when the product
bears the EEx Marking)
This equipment is intended for use in potentially 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 Category
3 equipment intended for use in potentially explosive atmospheres, given in Annex II
to this Directive.
Compliance with the Essential Health and Safety Requirements has been assured by
compliance with EN 60079-15 and EN 60079-0.