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
North American Hazardous Location Approval
FOUNDATION Fieldbus Junction Box 7
The following information applies when
operating this equipment in hazardous
locations.
Products marked "CL I, DIV 2, GP A, B, C, D" are
suitable for use in Class I Division 2 Groups A, B, C, D,
Hazardous Locations and nonhazardous locations
only. Each product is supplied with markings on the
rating nameplate indicating the hazardous location
temperature code. When combining products within
a system, the most adverse temperature code
(lowest "T" number) may be used to help determine
the overall temperature code of the system.
Combinations of equipment in your system are
subject to investigation by the local Authority
Having Jurisdiction at the time of installation.
WARNIN G:
Explosion Hazard -
• Do not disconnect equipment
unless power has been removed or
the area is known to be
nonhazardous.
• Do not disconnect connections to
this equipment unless power has
been removed or the area is known
to be nonhazardous. Secure any
external connec tions that mate to
this equipment by using screws,
sliding latches, threaded
connectors, or other means
provided with this product.
• Substitution of components may
impair suitability for Class I,
Division 2.
• If this product contains batteries,
they must only be changed in an
area known to be nonhazardous.
Informations sur l’utilisation de cet équipement
en environnements dangereux.
Les produits marqués "CL I, DIV 2, GP A, B, C, D" ne
conviennent qu'à une utilisation en environnements de
Classe I Division 2 Groupes A, B, C, D dangereux et non
dangereux. Chaque produit est livré avec des marquages
sur sa plaque d'identification qui indiquent le code de
température pour les environnements dangereux.
Lorsque plusieurs produits sont combinés dans un
système, le code de température le plus défavorable
(code de température le plus faible) peut être utilisé
pour déterminer le code de température global du
système. Les combinaisons d'équipements dans le
système sont sujettes à inspection par les autorités
locales qualifiées au moment de l'installation.
AVERTISSEMENT:
Risque d’Explosion –
• Couper le courant ou s'assurer que
l'environnement est classé non
dangereux avant de débrancher
l'équipement.
• Couper le courant ou s'assurer que
l'environnement est classé non
dangereux avant de débrancher les
connecteurs. Fixer tous les
connecteurs externes reliés à cet
équipement à l'aide de vis, loquets
coulissants, connecteurs filetés ou
autres moyens fournis avec ce produit.
• La substitution de composants peut
rendre cet équipement inadapté à une
utilisation en environnement de
Classe I, Division 2.
• S'assurer que l'environnement est
classé non dangereux avant de
changer les piles.
ATTENTION: Temperature Test at 60°C resulted in a maximum temperature of 96°C. Temperature test shall be
considered in end product evaluation.
ATTENTION: The front face has not been evaluated as an ultimate or overall enclosure.
ATTENTION: All terminals are suitable for factory wiring only.
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
8 FOUNDATION Fieldbus Junction Box
123
123
Red Green
FB+ FB- Shield
Wire the Junction Box
Use IEC61158-2 cable color coding for wiring the FOUNDATION Fieldbus
and device connectors as shown in the figure. Do not wire more than one
conductor on any single terminal.
WARNING : Temperature rating of conductors must be greater than 82 °C (179.6 °F).
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
FOUNDATION Fieldbus Junction Box 9
Item Description
A1, B1 Redundant
input pair
A2, B2 Redundant
output pair
D1…D4 Field device
drops
1788-FBJB4R Wiring
Connect the FOUNDATION Fieldbus trunk and field devices to
the1788-FBJB4R junction box as shown
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
10 FOUNDATION Fieldbus Junction Box
Item Description
T1, T2 FOUNDATION
Fieldbus trunk
input, output
D1…D6 Field device
drops
1784-FBJB6 Wiring
Connect the FOUNDATION Fieldbus trunk and field devices to the
1788-FBJB6 junction box as shown
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
FOUNDATION Fieldbus Junction Box 11
Switch Setting
1 Enable the bus terminator
2 Not used
3 Auto-reset in one hour
4 Auto-balance in ring topology
Switch Setting
1Enable the bus terminator
2 Not used
3 & 4 Auto-reset as follows:
43 Mode
00 No reset
01 Auto-reset in 5 min
1 0 Auto-reset in 1 hour
1 1 Auto reset in 12 hours
Set DIP Switches
Use the DIP switches on the front of the junction box to enable or disable the
built-in bus terminator and to configure the auto-reset function.
1788-FBJB4R
1788-FBJB6
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
12 FOUNDATION Fieldbus Junction Box
Operate the Junction Box
Reset Button
Press the Reset button on the front of the junction box to reset all indication of
trips on the device or trunk ports.
Term LE D
A lit Term LED indicates that the junction box is terminated.
Device LEDs
Interpret the Device LEDs as follows:
Device LED State Meainng
Off No current is being drawn. There is nothing on t he drop or the device is not
Green The device is operating in the allowed current band.
Red The drop is in over-current protec tion mode. The field device is faulty or the drop is
Blinking off/red No current is being drawn, but the drop was previously in over-ciurrent
Blkinking green/red The device is operating in the allowed current band, but the drop was previously
operation al.
shorted.
protection. This might indicate that the field device went faulty and then offline
or that a short has changed to an open circuit.
in over-current protection. This might indicate an intermittent fault in the field
device or drop cable.
Drop Trip
If the junction box detects that there is too much current being drawn on a drop
line, it will isolate that drop and keep the rest of the bus operating. The junction
box indicates which drop is in over-current protection by setting the drop LED
to constant red. Once the short/faulty device is removed the constant red will
blink OFF-RED, indicating that there was a fault. If the problem has been
rectified press the Reset button to remove the fault indication.
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
FOUNDATION Fieldbus Junction Box 13
Trunk Trip (1788-FBJB4R only)
If a trunk goes into over-current state, it will trip the specific trunk while keeping
the rest of the redundant bus active. The trip will remove the supply from the
over-current trunk and set the trunk LED to red. The fault latch does not
unlatch when the fault has been removed. You must reset the trunk trip by either
pressing the Reset button or setting DIP switches 3 and 4 to enable an auto-reset.
Specifications
Specifications - FOUNDATION Fieldbus Junction Boxes
Specification Value
1788-FBJB4R 1788-FBJB6
Input Voltage 12…32V DC, 0.5 A, Class 2/SELV
Trunk Output Voltage 12…32V DC, 0.36 A,
Drop Output Voltage 12…32V DC, 40 mA, resistive only
Power Consumption 40 mA at 24V max
Drop Current 40 mA
Trunk Current 360 mA 480 mA
Trunk Trip Current 490 mA N/A
Isolation Voltage no isolation between communication channels
Temperature, Operating IEC 60068-2-1 (Test Ad, Operating Cold),
Temperature, Surrounding Air, Max 60 ˚C (140 ˚F)
Temperature, Nonoperating IEC 60068-2-1 (Test Ab, Unpackaged Nonoperating Cold),
North American Temperature Code T4
resistive only
IEC 60068-2-2 (Test Bd, Operating Dry Heat),
IEC 60068-2-14 (Test Nb, Operating Thermal Shock):
0…60 ˚C (32…140 ˚F)
IEC 60068-2-2 (Test Bb, Unpackaged Nonoperating Dry Heat),
IEC 60068-2-14 (Test Na, Unpackaged Nonoperating Thermal Shock):
0…60 ˚C (32…140 ˚F)
12…32V DC, 0.48A, Resistive
Only
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
14 FOUNDATION Fieldbus Junction Box
Specifications - FOUNDATION Fieldbus Junction Boxes
Specification Value
1788-FBJB4R 1788-FBJB6
IEC Temperature Code T4
Relative Humidity IEC 60068-2-30 (Test Db, Unpackaged Damp Heat):
Vibration IEC 60068-2-6 (Test Fc, Operating): 0.5g@10…500 Hz
Shock, operating IEC 60068-2-27 (Test Ea, Unpa ckaged Shock): 15g
Shock, nonoperating IEC 60068-2-27 (Test Ea, Unpackaged Shock): 30g
Emissions CISPR 11 (IEC 61000-6-4): Class A
ESD Immunity IEC 61000-4-2:
5…95% noncondensing
6kV contact discharges, 8kV air discharges
Radiated RF Immunity IEC 61000-4-3:
10V/m with 1 kHz sine-wave 80% AM from 80…200 MHz
10V/m with 200 H 50% Pulse 100% AM at 900 MHz
10V/m with 200 Hz 50% Pulse 100% AM at 1890 MHz
3V/m with 1 kHz sine-wave 80% AM from 2000…2700 MHz
EFT/B Immunity IEC 61000-4-4: ±3kV at 5 kHz on communication ports
Surge Transient Immunity IEC 61000-4-5: ±2kV line-earth(CM) on communication port
Conducted RF Immunity IEC 61000-4-6:
10V rms with 1 kHz sine-wave 80% AM from 150 kHz…80 MHz
Enclosure Type Rating None (open style)
Wire Size Communications connections:
0.205... 0.823 mm
higer than 82 °C (179.6 °F), 1.2 mm (3/64 in.) insulation max.
Wirin g Categor y
Wirin g Torque
(conductor in terminal)
(1) Use this Conductor Category inform ation for planning conductor routing. Refer to Industrial Automation Wiring and
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
(1)
2 - on communication ports
0.5…0.6 Nm (4.4…5.3 lb-in)
Grounding Guidelines, publication 1770-4.1.
2
(24...18 AWG) solid or stranded copper wire rated
Certifications (when product is marked)
FOUNDATION Fieldbus Junction Box 15
details.
(1)
Description
Canada. See UL File E320594
• UL Recognized Component Industrial Control Equipment for Class I, Divi sion 2
Group A,B,C,D Hazardous Locations, certified for US and Canada.
See UL File E320595
• EN 61326-1; Meas./Control/Lab., Industrial Requirements
• EN 61000-6-2; Industrial Immunity
• EN 61000-6-4; Industrial Emissions
• EN 61131-2; Programmable Controllers (Clause 8, Zone A & B)
Emissions
• EN 60079-15; Potentially Explosive Atmospheres, Protection "n"
• EN 60079-0; General Requirements
• II 3 G Ex nA IIC T4 Gc X
with Article 58-2 of Radio Waves Act, Clause 3
Certificatio n
c-UR-us • UL Recognized Component Industrial Control Equipment, certified for US and
CE European Union 2004/108/EC EMC Directive, compliant with:
RCM Australian Radiocommunic ations Ac t, compliant with EN 61000-6- 4; Industrial
Ex European Union 94/9/EC ATEX Directive, compliant with:
KC • Korean Registration of Broadcasting and Communications Equipment, compliant
(1) See the Product Certification l ink at www.ab.com for Declarations of Conformity, Certificates, and other certification
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
16 FOUNDATION Fieldbus Junction Box
Dimensions
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
Notes:
FOUNDATION Fieldbus Junction Box 17
Rockwell Automation Publication 1788-IN006A-EN-P - September 2014
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At http://www.rockwellautomation.com/support
software service packs. You can also visit our Support Center at https://rockwellautomation.custhelp.com/
updates, support chats and forums, technical information, FAQs, and to sign up for product notification updates.
In addition, we offer multiple support programs for installation, configuration, and troubleshooting. For more information,
contact your local distributor or Rockwell Automation representative, or visit
http://www.rockwellautomation.com/services/online-phone
Installation Assistance
If you experience a problem within the first 24 hours of installation, please review the informatio n that's contained in this
manual. You can also contact a special Customer Support number for initial help in getting your product up and running.
United States or Canada 1.440.646.3434
Use the Wor ldwi de Loc ator
Outside United States or Canada
http://www.rockwellautomation.com/rockwellautomation/support/overview.page
contact your local Rockwell Automation representative.
New Product Satisfaction Return
Rockwell Automation tests all of its products to help ensure that they are fully operational when shipped from the
manufacturing facility. However, if your product is not functioning and needs to be returned, foll ow these procedures.
United States
Outside United States Please contact your local Rockwell Automation representative for the return procedure.
Contact your distributor. You must provide a Customer Support case number (call the pho ne
number above to obtain one) to your distributor to complete the return process.
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Trademarks not belonging to Rockwell Automation are property of their respective companies.
Publication 1788-IN006A-EN-P - September 2014 PN-259887
Copyright © 2014 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.
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