Allen-Bradley 1788-CN2FFR ControlNet to FOUNDATION Fieldbus Linking Device

Product Description

The 1788-CN2FFR is a specialized industrial network bridge designed to integrate FOUNDATION Fieldbus (FF) H1 segments directly into a ControlNet architecture. This linking device functions as a high-speed gateway, allowing controllers on a ControlNet network to communicate seamlessly with field-level instrumentation. By acting as the primary interface between these two distinct protocols, the 1788-CN2FFR (Part Number: 1788-CN2FFR) enables centralized configuration and asset management of fieldbus devices within a Process Automation System.

Engineered for mission-critical reliability, the module features dual BNC connectors to support redundant ControlNet media, ensuring continuous operation even in the event of a single cable failure. The device is housed in an open-style enclosure optimized for 35mm DIN rail mounting and is specifically designed for process control environments where high-speed data exchange and robust physical layer isolation are mandatory.

Technical Specifications

• Brand: Allen-Bradley (Rockwell Automation)

• Model Number: 1788-CN2FFR

• Device Function: ControlNet-to-FOUNDATION Fieldbus H1 Linking

• ControlNet Interface: 2 x BNC Coaxial Ports (Redundant Support)

• Fieldbus Interface: H1 FOUNDATION Fieldbus (High-speed linking)

• Operational Voltage: 24V to 32V DC

• Current Consumption: 260 mA @ 24V DC

• Power Dissipation: 12.4 Watts @ 24V DC

• Fieldbus Current Output: 0.5 Amps @ 24V DC

• Isolation Rating: 30V (Continuous)

• Network Topology: Star, Tree, or Daisy Chain (Fieldbus side)

• Enclosure Rating: Open-Style / IP20

• Environmental Temperature: Industrial grade operating range

• Physical Weight: 0.57 kg (1.25 lbs)

Integration and Application

This linking device is typically utilized in large-scale process plants where legacy ControlNet backbones must interface with modern smart instrumentation. The 1788-CN2FFR simplifies the network layer by allowing engineers to map Fieldbus device data directly into the ControlNet I/O image, effectively bridging the gap between plant floor control and field-level sensing.

Engineering FAQ

Does the 1788-CN2FFR support redundant media on both networks?The module is designed with redundant ControlNet BNC ports for high-availability communication. On the FOUNDATION Fieldbus side, it manages H1 segments; redundancy at that level is typically handled by the network architecture and segment design rather than the linking device itself.

What cabling is required for the ControlNet connection?Standard ControlNet RG-6 coaxial cable with BNC connectors is required for the primary ports. For any Ethernet-based configuration or diagnostic bridging, CAT5 Shielded Twisted Pair (STP) is recommended to maintain signal integrity in high-noise environments.