Allen Bradley 1788-FBJB6 6-Channel Junction Box For Redundant Fieldbus
Allen Bradley 1788-FBJB6 6-Channel Junction Box For Redundant Fieldbus
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Brand:Allen Bradley PLC Item No.:1788-FBJB6 Product Origin:USA Product Dimensions:114.5 x 35.7 x 99 mm Product Weight:0.34 kg Payment:T/T, Western Union, Credit Card Goods_stock:15 Shipping Port:Xiamen, China Lead Time:1-3 Days Condition:Brand New And Original Warranty:1 Year Certificate:COO
The Allen Bradley 1788-FBJB6 is a six-way fieldbus junction box from the 1788 Linking Devices product family. It provides a connection point for FOUNDATION Fieldbus networks, with a bus input, bus output, and six field-device drop-line ports.
One of its important features is segment-level current monitoring. When a fault occurs on an individual drop line, the junction box limits current to that affected segment. This fault-tolerant design helps prevent a problem on one field-device connection from interrupting communication across the other connected segments. LED indicators also provide useful diagnostic information for maintenance personnel.
The 1788-FBJB6 operates from a 12–32 V DC supply and is intended for industrial fieldbus installations. Its compact form factor makes it practical for organizing field wiring in process automation and distributed control environments.
This model was discontinued by Rockwell Automation on March 1, 2024, with no planned manufacturer replacement. It may therefore be relevant to maintenance projects, legacy system support, and equipment replacement requirements where the existing network is designed around this specific junction box.
Technical Specifications
Parameter
Specification
Brand
Allen Bradley
Model
1788-FBJB6
Product Family
1788 Linking Devices
Product Type
6-Channel Fieldbus Junction Box
Network Type
FOUNDATION Fieldbus H1
Connection Ports
Bus Input, Bus Output, 6 Field-Device Drop Ports
Input Voltage
12–32 V DC
Input Current
0.5 A
Trunk Output
12–32 V DC, 0.48 A
Drop Output
12–32 V DC, 40 mA
Power Consumption
40 mA at 24 V DC, maximum
Diagnostic Indicators
LED Indicators
Fault Protection
Individual Drop-Line Current Limiting
Mounting
DIN Rail
Operating Temperature
0–60°C
Relative Humidity
5–95%, Non-Condensing
Dimensions
114.5 × 35.7 × 99 mm
Weight
0.34 kg / 0.75 lb
Lifecycle Status
Discontinued
Recommended Related Models
The following Allen Bradley products are relevant to fieldbus connection and communication system projects:
1788-FBJB4R – FOUNDATION Fieldbus 4-Way Junction Box for field-device connections.
1788-EN2FFR – FOUNDATION Fieldbus Linking Device for industrial network integration.
1788-EN2PAR – PROFIBUS PA Linking Device for process automation applications.
Check protocol support, port configuration, and system architecture before choosing a related model as an alternative.
Popular Related Models
1788-FBJB4R – Allen Bradley FOUNDATION Fieldbus Junction Box.
1788-EN2FFR – Allen Bradley FOUNDATION Fieldbus Linking Device.
1788-EN2PAR – Allen Bradley PROFIBUS PA Linking Device.
1788-CN2FFR – Allen Bradley ControlNet to FOUNDATION Fieldbus Linking Device.
For legacy fieldbus maintenance and replacement projects, verify the complete catalog number and hardware condition before ordering. Since the 1788-FBJB6 is discontinued, checking availability and confirming compatibility with the installed fieldbus network are particularly important.
Applications
The Allen Bradley 1788-FBJB6 6-Channel Junction Box for Redundant Fieldbus is designed to provide a field connection point in industrial fieldbus networks. It supports the organization of fieldbus wiring and helps connect multiple field devices to a shared network infrastructure.
Typical applications include:
Process Automation: Provides a structured field connection point in process control installations.
Distributed Control Systems: Supports fieldbus wiring arrangements used in DCS environments.
Redundant Fieldbus Networks: Used in installations designed around redundant fieldbus communication paths.
Industrial Instrumentation: Helps organize connections for field-mounted instruments and equipment.
Manufacturing Facilities: Supports fieldbus infrastructure in automated production environments.
Control System Expansion: Provides additional field connection capacity when expanding a compatible fieldbus installation.
Key Features and Advantages
1. Six-Channel Connection Design
The 1788-FBJB6 is designed as a six-channel junction box, providing an organized connection point for fieldbus wiring.
2. Support for Redundant Fieldbus Applications
It is intended for redundant fieldbus installations, helping engineers organize field connections within an appropriately designed network architecture.
3. Simplified Field Wiring
A dedicated junction point can make field wiring easier to arrange, inspect, and maintain compared with scattered individual connections.
4. Compact Installation Footprint
Its compact dimensions allow it to be incorporated into industrial control and field connection arrangements where mounting space is limited.
5. Improved Maintenance Organization
Centralizing field connections can help technicians identify wiring paths and carry out inspection or troubleshooting more efficiently.
6. Industrial Automation Integration
The junction box is intended for use in compatible Allen Bradley fieldbus systems. System designers should verify network topology and connection requirements before installation.
Technical FAQs
Q1: What type of fieldbus network does the 1788-FBJB6 support?
The 1788-FBJB6 is designed for FOUNDATION Fieldbus H1 networks. It is also listed for use with PROFIBUS PA applications in the product's general description. Confirm the specific network and wiring requirements before installation.
Q2: How many field-device connections are available?
It provides six H1 field-device drop-line ports, in addition to the bus input and bus output connections.
Q3: What is the operating voltage range?
The specified input voltage range is 12–32 V DC, with a maximum input current rating of 0.5 A.
Q4: What is the trunk output rating?
The trunk output is rated at 12–32 V DC and 0.48 A for resistive loads.
Q5: What is the field-device drop output rating?
Each drop output is specified for 12–32 V DC and 40 mA. The connected field devices must remain within the applicable output limits.
Q6: How does the junction box respond to a short circuit on a field-device segment?
The unit continuously monitors the current on each drop-line segment. If a fault is detected, it limits the current to the affected segment, helping other connected field devices continue communicating.
Q7: Does the unit provide diagnostic information?
Yes. LED indicators provide fieldbus diagnostic information, helping technicians identify operating conditions and investigate connection problems.
Q8: What is the operating temperature range?
The specified operating temperature range is 0–60°C. Installation should also account for the permitted humidity and environmental conditions.
Q9: Can the 1788-FBJB6 be used as a direct replacement for another junction box?
Not automatically. Verify the fieldbus protocol, trunk and drop connections, electrical ratings, wiring arrangement, and mounting requirements before selecting it as a replacement.
Q10: Is the 1788-FBJB6 still manufactured?
Rockwell Automation has discontinued this product effective March 1, 2024, and has not announced a planned replacement. Buyers should confirm stock condition, authenticity, and availability before procurement.
