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Allen-Bradley 1788-FBJB4R 4-Way Redundant Intelligent FOUNDATION Fieldbus Junction Box – Technical Specifications and FAQ
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Manufacturer | Rockwell Automation |
| Model | 1788-FBJB4R |
| Product Name | 4-Way Redundant Intelligent Fieldbus Junction Box |
| Product Type | FOUNDATION Fieldbus junction box |
| Communication Protocol | FOUNDATION Fieldbus H1 / PROFIBUS PA |
| Trunk Input | 1 bus-input port |
| Trunk Output | 1 bus-output port |
| Field Device Connections | 4 drop-line ports |
| Redundancy | Redundant fieldbus trunk support |
| Input Voltage | 12–32 V DC |
| Input Current | 0.5 A maximum |
| Trunk Output Current | 0.36 A |
| Drop Output Current | 40 mA per drop |
| Power Consumption | 40 mA at 24 V DC maximum |
| Short-Circuit Protection | Individual drop-line current limitation |
| Isolation | No isolation between communication channels |
| Mounting | DIN rail |
| Enclosure Rating | Open-style; no IP protection rating |
| Operating Temperature | 0 to +60°C (32 to +140°F) |
| Relative Humidity | 5–95%, non-condensing |
| Temperature Code | T4 |
| Terminal Wire Size | 0.205–0.823 mm² (24–18 AWG) |
| Terminal Torque | 0.5–0.6 N·m |
| Country of Origin | United Kingdom |
| Lifecycle Status |
Discontinued
March 1, 2024 |
| Replacement | No planned direct Rockwell Automation replacement |
| Dimensions | Exact overall dimensions not specified in the published technical data |
| Weight | Not specified in official documentation |
FAQ
FAQ
Q1: What is the Allen-Bradley 1788-FBJB4R used for?
A: It connects FOUNDATION Fieldbus H1 field devices to a fieldbus trunk and provides intelligent distribution and protection for individual device connections.
Q2: How many field devices can it connect?
A: It provides four field-device drop-line connections.
Q3: What does the redundant function mean?
A: It supports redundant fieldbus trunk arrangements to improve network availability and fault tolerance.
Q4: Does the 1788-FBJB4R provide short-circuit protection?
A: Yes. Each drop-line port is continuously monitored. If a short circuit occurs on one segment, its current is limited so other connected field devices can continue communicating.
Q5: What power supply does it require?
A: It requires 12–32 V DC input power, with a maximum input current of 0.5 A.
Q6: What is the operating temperature range?
A: The specified operating temperature range is 0 to +60°C (32 to +140°F).
Q7: Is the 1788-FBJB4R discontinued?
A: Yes. Rockwell Automation announced discontinuation effective March 1, 2024, with no planned direct Rockwell replacement.
Q8: What are the dimensions and weight for shipping?
A: Rockwell does not publish confirmed overall dimensions or net weight in the technical specification. For international freight quotations, the actual packed dimensions and gross weight should be measured rather than estimated.
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Packing & Delivery
We will use wear-resistant cartons to seal the boxes, and take photos for your confirmation before sealing. We will pack the boxes only after confirmation.
For express delivery, we will use DHL, UPS, TNT, FedEx and EMS.
Please rest assured that we have a deep cooperation with express delivery companies and can ensure that your goods are delivered to you in good condition.
