Publication 1794-IN049D-EN-P - January 2009
Installation Instructions
FLEX I/O 2 Input Frequency Module
Cat. No. 1794-IJ2, 1794-IJ2K, and 1794-IJ2XT
(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 frequency input modules are European Zone 2 approved:
1794-IJ2, 1794-IJ2K, and 1794-IJ2XT
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
available from your local Rockwell Automation sales office or
online at
http://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.
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
If 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.
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
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.
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
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.
•
Use a static-safe workstation, if available.
•
Store the equipment in appropriate static-safe packaging when not in
use.
ATTENTION
To reduce susceptibility to noise, power analog modules and digital modules
from separate power supplies. Do not exceed a total length of 9.8 ft (3m) for
dc power cabling.
European Zone 2 Certification (The following applies when the product bears the Ex
or 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.
