Rockwell Automation 1788-FBJB6 User Manual
Installation Instructions
FOUNDATION Fieldbus Junction Box
Catalog Number 1788-FBJB4R, 1788-FBJB6
Top ic Pag e
Important User Information 2
About the Junction Boxes 3
Additional Resources 3
Installation Requirements 4
Wire the Junction Box 8
Set DIP Switches 11
Operate the Junction Box 12
Specifications 13
Certifications (when product is marked) 15
Dimensions 16
2 FOUNDATION Fieldbus Junction Box
IMPORTANT
Important User Information
Read this document and the do cuments listed in the additional resources section about installation, configuration, and
operation of this equipment before you install, configure, operate, or maintain thi s product. Users are required to familiarize
themselves with installation and wirin g instructions in addition to requirements of all ap plicable codes, laws, and standards.
Activities including installation, adjust ments, putting into service, use, assembly, disassembly, and maintenance are required to
be carried out by suitably trained personnel in accordance with applicable code of practice.
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be
impaired.
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 i ncluded solely for illustrative purposes. Because of the many variables and
requirements associated with any particular inst allation, Rockwell Automation, Inc. cannot assume respo nsibility or liability for
actual use based on the examples a nd diagrams.
No patent liability is assumed by Rockwell Automation , Inc. with respect to use of information, circuits, equipment, or soft ware
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, when necessary, 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.
ATTENTION: Identifies information about practices or circumstances that can lead to personal i njury or death,
property damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the
consequence.
Identifies information that is critical for successful application and understanding of the produc t.
Labels may also be on or inside th e equipment to provide specific precautions.
SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that
dangerous voltage may be present.
BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that
surfaces may reach dangerous temperatures.
ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert
people to potential Arc Flash. Arc Flash will cause severe injur y or death. Wear proper Personal Protective
Equipment (PPE). Follow ALL Regulatory requi rements for safe work practices and for Personal Protective
Equipment (P PE).
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
FOUNDATION Fieldbus Junction Box 3
About the Junction Boxes
The 1788-FBJB4R and 1788-FBJB6 junction boxes provide a simple and fault
tolerant means of connecting a FOUNDATION Fieldbus network. The
1788-FBJB4R connects to up to four field devices and has dual trunk input and
output connectors for use in redundant FOUNDATION Fieldbus
configurations. The 1788-FBJB6 has a single trunk input connector and trunk
output connector and connects to up to six field devices.
The junction box continuously monitors the bus current on each field device
port. If a field device port over-current fault is detected, current to the faulted
port is limited to a safe value. Even with one drop line shorted, all other field
devices are able to communicate.
Additional Resources
These documents contain additional information concerning related products
from Rockwell Automation.
Resource Description
FOUNDATION Fieldbus Linking Devices Technical
Data, publication 1788-TD001
FOUNDATION Fieldbus Design Considerations
Reference Manual, publication PROCES-RM005
EtherNet/IP and ControlNet to FOUNDATION Fieldbus
Linking Device User Manual, publication
1788-UM057
Industrial Automation Wiring and Grounding
Guidelines, publication 1770-4.1
Product Certifications website, http://www.ab.com Provides declarations of conformity, cer tificates, and
Provides technical data and specifications for the
FOUNDATION Fieldbus linking devices.
Provides design choices and best practices for
implementing a FOUNDATION Fieldbus network
with the 1788-EN2FFR and 1788-CN2FFR linking
devices.
Describes installation and operation of the
1788-EN2FFR and 1788-CN2FFR linking devices.
Provides general guidelines for installing a Rockwell
Automation industrial system.
other certification details.
You can view or download publications at
http://www.rockwellautomation.com/literature/
. To order paper copies of
technical documentation, contact your local Allen-Bradley distributor or
Rockwell Automation sales representative.
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
4 FOUNDATION Fieldbus Junction Box
Installation Requirements
WARNING : If you connect or disconnect the communications cable with power applied to this module or any
device on the network, an elec trical arc can occur. This could cause an explosion in hazardous location
installations. Be sure that power is removed or the area is non hazardous before proceeding.
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 discha rge 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.
To comply with the CE Low Voltage Directive (LVD), all connections to this
equipment must be powered from a source compliant with Safety Extra Low
Voltage (SELV) or Protected Extra Low Voltage (PELV).
To comply with UL restrictions, all connections to this equipment must be
powered from a source compliant with Class 2 or Limited Voltage/Current.
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
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 not intended for use in residential environments and may not provide adequate protection to
radio communication services in such environments.
This equipment is supplied as open-t ype equipment. It must be mounted within an enclosure that is suitab ly
designed for those specific environmental conditions that will be present and a ppropriately 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 or be
approved for the application if nonmetallic. The interior of the enclosu re 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 cer tain product safety certifications.
In addition to this publication, see the following:
• Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1, for additional
installation requirements.
• NEMA Standard 250 and IEC 60529, as applicable, for explanations of the degrees of protection
provided by enclosures.
FOUNDATION Fieldbus Junction Box 5
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
6 FOUNDATION Fieldbus Junction Box
European Hazardous Location Approval
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 Zone 2 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 60079-15:2010 and
EN 60079-0:2012+A11:2013..
WARNING : This equipment shall be mounted in an ATEX-certified enclosure with a minimum i ngress protection
rating of at least IP54 (as defined in IEC 60529) and used in an environment of not more than Pollution Degree 2
(as defined in IEC 60664-1) when applied in Zone 2 environments. The enclosure must have a tool-removable
cover or door.
WARNING : Provision shall be made, either in the apparatus or external to the apparatus, to prevent the rated
voltage from being exceeded by transient disturbances of more than 140%.
WARNING : Secure any external connect ions that mate to this equipment by using screws, sliding latches,
threaded connectors, or other means provided with this product.
WARNING : Do not disconnect equipment unless power has b een removed or the area is known to be
nonhazardous.
WARNING : Do not disconnect equipment unless power has b een removed or the area is known to be
nonhazardous.
WARNING : Secure any external connect ions that mate to this equipment by using screws, sliding latches,
threaded connectors, or other means provided with this product
WARNING : This equipment shall be used within its specified ratings defined by Rockwell Automation.
WARNING : Devices shall be used in an environment of not more than Pollution Degree 2.
ATTENTION: This equipment is not resistant to sunlight or other sources of UV radiation.
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
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