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- Allen Bradley
- 1788-CN2FFR
- Linking Device
- USA
- 152 × 80 × 136 mm
- 0.57 kg
- Xiamen, China
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Product Overview
The Allen Bradley 1788-CN2FFR is a redundant ControlNet to FOUNDATION Fieldbus H1 Linking Device designed to connect ControlNet-based automation systems with FOUNDATION Fieldbus process instrumentation. It belongs to the Allen-Bradley Bulletin 1788 Linking Devices family and serves as a communication gateway between the controller network and field-level instruments.
The device provides a ControlNet interface on the controller side and two FOUNDATION Fieldbus H1 hardware ports on the fieldbus side. The H1 segment can support up to 16 field devices, making the linking device suitable for connecting multiple process instruments through a single communication gateway.
One important feature is its integrated FOUNDATION Fieldbus power conditioning. The device supplies conditioned power to the H1 network, eliminating the need for separate external fieldbus power conditioners in the supported configurations.
The 1788-CN2FFR also supports redundant ControlNet media and different FOUNDATION Fieldbus network topologies. This makes it useful in process automation installations where communication availability and integration with existing ControlNet infrastructure are important.
Configuration is performed through the Studio 5000 Logix Designer environment using the dedicated Add-On Profile (AOP). The linking device allows the controller to exchange process data with FOUNDATION Fieldbus instruments while maintaining the existing ControlNet architecture.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley |
| Brand Owner | Rockwell Automation |
| Model | 1788-CN2FFR |
| Product Series | Bulletin 1788 Linking Devices |
| Product Type | Redundant ControlNet to FOUNDATION Fieldbus H1 Linking Device |
| ControlNet Interface | ControlNet Coaxial Media |
| Fieldbus Protocol | FOUNDATION Fieldbus H1 |
| Fieldbus Ports | 2 Hardware Ports |
| Maximum Field Devices | 16 per H1 Segment |
| H1 Port Output | 500 mA per Port |
| Power Supply Input | 24–32V DC, 0.75A |
| FOUNDATION Fieldbus Power Output | 0.5A at 24V DC, Single Trunk |
| FOUNDATION Fieldbus Power Output | 0.4A at 24V DC, Dual Trunk |
| Power Conditioning | Built-in |
| High-Speed Ethernet (HSE) | Not Supported |
| ControlNet Redundancy | Supported |
| Configuration Software | Studio 5000 Logix Designer |
| Configuration Interface | Add-On Profile (AOP) |
| Isolation Voltage | 30V Continuous |
| Enclosure Type | Open-Style |
| Operating Temperature | 0–60°C |
| Storage Temperature | -40 to +85°C |
| Relative Humidity | 5–95%, non-condensing |
| Dimensions | 152 × 80 × 136 mm |
| Weight | 0.57 kg |
Product Features
- ControlNet-to-FOUNDATION Fieldbus Gateway: Connects ControlNet automation systems with FOUNDATION Fieldbus H1 process instrumentation.
- Redundant ControlNet Media: Supports redundant ControlNet communication arrangements to improve network availability.
- Dual H1 Hardware Ports: Provides two fieldbus ports for supported FOUNDATION Fieldbus network configurations.
- 16-Device H1 Capacity: Supports up to 16 field devices on an H1 segment.
- Integrated Power Conditioning: Includes built-in FOUNDATION Fieldbus power conditioning, eliminating the need for additional external conditioners.
- 500 mA Port Capacity: Each H1 hardware port can provide up to 500 mA.
- Multiple Network Topologies: Supports redundant and non-redundant fieldbus arrangements, including ring, split, and redundant trunk configurations.
- Studio 5000 Configuration: Uses a dedicated Add-On Profile for configuration and integration with Logix controllers.
- FOUNDATION Fieldbus Host Capability: Includes Link Active Scheduler (LAS) functionality for managing fieldbus communication.
- Industrial Network Integration: Allows existing FOUNDATION Fieldbus instruments to communicate with ControlNet-based control systems.
Product Working Principle
The 1788-CN2FFR operates as a communication gateway between ControlNet and FOUNDATION Fieldbus H1. Its main task is to transfer process information between the controller network and connected field instruments.
The communication process involves several stages.
1. ControlNet Communication
The linking device connects to the ControlNet network through its coaxial media interface. It exchanges controller data with the connected ControlNet infrastructure and supports redundant media arrangements.
2. FOUNDATION Fieldbus H1 Communication
On the fieldbus side, the device provides two hardware ports for connecting FOUNDATION Fieldbus H1 segments. These ports allow compatible field instruments to communicate with the automation system.
3. Process Data Exchange
The linking device manages the communication between ControlNet and FOUNDATION Fieldbus. Process variables and field device information are made available to the controller through the configured communication structure.
4. Fieldbus Power Conditioning
The 1788-CN2FFR incorporates a built-in power conditioner for the FOUNDATION Fieldbus network. It supplies conditioned DC power to the H1 segment while allowing communication signals to travel over the same fieldbus wiring.
5. Communication Scheduling
The device includes Link Active Scheduler functionality. The LAS manages scheduled communication activities on the H1 segment, helping coordinate data exchanges between fieldbus devices.
A simplified network arrangement is:
ControlLogix Controller → ControlNet Network → 1788-CN2FFR → FOUNDATION Fieldbus H1 → Field Instruments
The device does not support the FOUNDATION Fieldbus High-Speed Ethernet (HSE) layer; its field-level communication is based on H1.
Role in Allen-Bradley ControlNet and FOUNDATION Fieldbus Control Architecture
Within an Allen-Bradley process automation system, the 1788-CN2FFR provides the communication connection between ControlNet-based controllers and FOUNDATION Fieldbus instruments.
The controller communicates with the linking device through ControlNet, while the fieldbus side connects process instruments such as transmitters, positioners, and other compatible H1 devices.
The integrated power conditioning function is particularly useful because it reduces the need for separate fieldbus power-conditioning equipment.
| System Component | Function |
|---|---|
| 1788-CN2FFR | Connects ControlNet with FOUNDATION Fieldbus H1 |
| ControlLogix Controller | Executes process control and automation logic |
| 1756-CNB | Provides ControlNet communication for ControlLogix systems |
| 1756-CNBR | Supports redundant ControlNet communication |
| ControlNet Coaxial Cable | Provides the ControlNet communication path |
| FOUNDATION Fieldbus H1 Cable | Connects field instruments to the linking device |
| FOUNDATION Fieldbus Transmitters | Measure process variables such as pressure, temperature, and flow |
| FOUNDATION Fieldbus Positioners | Control valve positioning |
| 1788-FBJB4R | Provides redundant FOUNDATION Fieldbus junction connections |
| 1788-FBJB6 | Provides FOUNDATION Fieldbus field device connections |
| 24V DC Power Supply | Supplies operating power to the linking device |
Industrial Applications
The 1788-CN2FFR is particularly suitable for process industries where FOUNDATION Fieldbus instruments need to communicate with an existing ControlNet-based automation system.
| Industrial Application | Typical Use |
|---|---|
| Oil and Gas | Integrating FOUNDATION Fieldbus pressure and flow transmitters |
| Chemical Processing | Connecting field instruments to ControlNet-based controllers |
| Petrochemical Plants | Supporting distributed process instrumentation |
| Power Generation | Integrating fieldbus measurement and control devices |
| Water Treatment | Connecting process transmitters and control instruments |
| Pharmaceutical Manufacturing | Supporting communication between controllers and process instruments |
| Pulp and Paper | Integrating fieldbus devices into process control networks |
| Food and Beverage | Connecting process measurement instruments |
| Industrial Utilities | Supporting distributed field instrumentation |
| Refining Operations | Connecting fieldbus-based process equipment to ControlNet systems |
Installation and Maintenance
- Verify the Model Number: Confirm that 1788-CN2FFR is the required redundant ControlNet to FOUNDATION Fieldbus H1 linking device.
- Check Power Requirements: Prepare a suitable 24–32V DC power supply that meets the specified input requirements.
- Inspect the Device: Examine the communication connectors, power terminals, housing, and mounting components for damage.
- Prepare the Installation Location: Select a suitable control cabinet location with sufficient ventilation and clearance for field wiring.
- Mount the Linking Device: Install the unit on the designated mounting arrangement according to the manufacturer’s instructions.
- Connect ControlNet Media: Connect the ControlNet coaxial cables and configure redundant media connections where required.
- Connect FOUNDATION Fieldbus Wiring: Wire the H1 fieldbus segments to the designated hardware ports, observing the correct polarity and wiring requirements.
- Check Fieldbus Topology: Confirm that the selected ring, split, or redundant trunk arrangement matches the system design.
- Connect the DC Power Supply: Wire the 24–32V DC supply to the designated terminals and verify the polarity before energizing the device.
- Configure the Linking Device: Use Studio 5000 Logix Designer and the dedicated Add-On Profile to configure the device and connected field instruments.
- Verify Network Communication: Check the ControlNet and FOUNDATION Fieldbus status indicators and confirm that connected field devices are recognized.
- Perform Routine Inspection: Periodically inspect the power connections, fieldbus wiring, ControlNet media, grounding, and communication status indicators.
Compatible System Components
| Component | Function |
|---|---|
| Allen-Bradley 1788-CN2FFR | Redundant ControlNet to FOUNDATION Fieldbus H1 Linking Device |
| Allen-Bradley 1788-EN2FFR | Redundant EtherNet/IP to FOUNDATION Fieldbus H1 Linking Device |
| Allen-Bradley 1788-FBJB4R | 4-Way Redundant Intelligent Fieldbus Junction Box |
| Allen-Bradley 1788-FBJB6 | 6-Way Intelligent Fieldbus Junction Box |
| Allen-Bradley 1756-CNB | ControlLogix ControlNet Bridge Module |
| Allen-Bradley 1756-CNBR | ControlLogix Redundant ControlNet Bridge Module |
| Allen-Bradley ControlLogix CPU | Controller for process automation |
| FOUNDATION Fieldbus H1 Instruments | Field-level measurement and control devices |
| 24V DC Power Supply | External power source for the linking device |
Recommended Related Models
| Model | Product Type | Application |
|---|---|---|
| Allen-Bradley 1788-EN2FFR | Redundant EtherNet/IP to FOUNDATION Fieldbus H1 Linking Device | EtherNet/IP to H1 network integration |
| Allen-Bradley 1788-CN2PAR | Redundant ControlNet to PROFIBUS-PA Linking Device | ControlNet to PROFIBUS-PA integration |
| Allen-Bradley 1788-EN2PAR | Redundant EtherNet/IP to PROFIBUS-PA Linking Device | EtherNet/IP to PROFIBUS-PA integration |
| Allen-Bradley 1788-FBJB4R | 4-Way Redundant Intelligent Fieldbus Junction Box | Redundant H1 field device connections |
| Allen-Bradley 1788-FBJB6 | 6-Way Intelligent Fieldbus Junction Box | FOUNDATION Fieldbus device distribution |
| Allen-Bradley 1756-CNBR | ControlLogix Redundant ControlNet Bridge Module | Redundant ControlNet communication |
Key Advantages
- Bridges ControlNet and FOUNDATION Fieldbus H1 networks.
- Supports up to 16 H1 field devices per segment.
- Provides two FOUNDATION Fieldbus hardware ports.
- Includes integrated fieldbus power conditioning.
- Supports redundant ControlNet media.
- Provides built-in Link Active Scheduler functionality.
- Configurable through Studio 5000 Logix Designer.
Technical FAQs
1. How many FOUNDATION Fieldbus devices can the 1788-CN2FFR support?
The device supports up to 16 FOUNDATION Fieldbus devices on an H1 segment. The actual number of devices used should also account for segment power requirements, communication loading, and network design.
2. Does the 1788-CN2FFR require an external FOUNDATION Fieldbus power conditioner?
No. The linking device includes integrated FOUNDATION Fieldbus power conditioning. Separate external fieldbus power conditioners are not required for its supported H1 configurations.
3. What is the difference between 1788-CN2FFR and 1788-EN2FFR?
The 1788-CN2FFR connects a ControlNet network to FOUNDATION Fieldbus H1, while the 1788-EN2FFR connects an EtherNet/IP network to FOUNDATION Fieldbus H1. Both devices provide fieldbus integration and built-in power conditioning, but use different controller-side communication networks.
4. Can the 1788-CN2FFR support redundant FOUNDATION Fieldbus configurations?
Yes. The device supports multiple network topologies, including ring, split, and redundant trunk arrangements. The selected configuration must follow the manufacturer’s network design and wiring requirements.