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- Allen Bradley
- 1788-EN2FFR
- Linking Device
- USA
- 152 × 80 × 136 mm
- 0.54 kg
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Product Overview
The Allen Bradley 1788-EN2FFR is a redundant EtherNet/IP to FOUNDATION Fieldbus H1 Linking Device designed to integrate process instrumentation into Allen-Bradley Logix-based automation systems. It belongs to the Bulletin 1788 Linking Devices family and provides a communication gateway between EtherNet/IP controllers and FOUNDATION Fieldbus H1 field devices.
The device connects to an EtherNet/IP network through two Ethernet ports and provides two physical hardware ports for FOUNDATION Fieldbus H1 connections. Both H1 ports belong to the same logical fieldbus segment, allowing the network to be divided between two physical connection points.
The 1788-EN2FFR supports up to 16 FOUNDATION Fieldbus devices on a single H1 segment. Its built-in fieldbus power conditioning eliminates the need for a separate external FOUNDATION Fieldbus power conditioner in supported configurations.
Another important capability is its support for different media redundancy arrangements, including ring, split, and redundant trunk configurations. These options allow system integrators to select a network topology according to installation requirements.
The linking device is configured through Studio 5000 Logix Designer using a dedicated Add-On Profile (AOP). It also provides FOUNDATION Fieldbus host functionality, including Link Active Scheduler (LAS) capability, for coordinating communication between field instruments.
The 1788-EN2FFR is particularly suitable for process automation projects where existing FOUNDATION Fieldbus instrumentation needs to communicate with EtherNet/IP-based control systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley |
| Brand Owner | Rockwell Automation |
| Model | 1788-EN2FFR |
| Product Series | Bulletin 1788 Linking Devices |
| Product Type | EtherNet/IP to FOUNDATION Fieldbus Linking Device |
| Official Product Designation | Redundant EtherNet/IP to FOUNDATION Fieldbus H1 Linking Device |
| Controller Network | EtherNet/IP |
| Fieldbus Protocol | FOUNDATION Fieldbus H1 |
| Ethernet Ports | 2 |
| Ethernet Cable Type | CAT5 STP/UTP |
| H1 Hardware Ports | 2 |
| Logical H1 Segments | 1 |
| Maximum Field Devices | 16 per H1 Segment |
| H1 Port Current Capacity | 500 mA per Port |
| Power Supply Input | 24–32V DC, 0.75A |
| FOUNDATION Fieldbus Output | 0.5A at 24V DC, Single Trunk |
| FOUNDATION Fieldbus Output | 0.4A at 24V DC, Dual Trunk |
| Power Conditioning | Built-in |
| Fieldbus Host Functionality | Supported |
| Link Active Scheduler (LAS) | Supported |
| High-Speed Ethernet (HSE) | Not Supported |
| Network Topologies | Ring, Split, Redundant Trunk |
| Configuration Software | Studio 5000 Logix Designer |
| Configuration Interface | Add-On Profile (AOP) |
| Power Consumption | 260 mA at 24V DC, without field devices |
| Power Dissipation | 12.24 W at 24V DC |
| Isolation Voltage | 30V Continuous |
| Isolation Test Voltage | 500V DC for 60 Seconds |
| 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 | 0.54 kg |
Product Features
- EtherNet/IP-to-FOUNDATION Fieldbus Integration: Establishes a direct communication gateway between EtherNet/IP controllers and FOUNDATION Fieldbus H1 instrumentation.
- Dual Ethernet Ports: Provides two Ethernet connections for integration into supported industrial network arrangements.
- Dual H1 Hardware Ports: Offers two physical fieldbus connection points belonging to one logical H1 segment.
- 16-Device Capacity: Supports up to 16 FOUNDATION Fieldbus devices on a single H1 segment.
- Integrated Power Conditioning: Includes built-in fieldbus power conditioning, eliminating the need for an additional external conditioner.
- 500 mA Port Capacity: Each H1 hardware port can provide up to 500 mA.
- Multiple Network Topologies: Supports ring, split, and redundant trunk arrangements for different fieldbus installation requirements.
- FOUNDATION Fieldbus Host Capability: Includes Link Active Scheduler functionality for coordinating fieldbus communication.
- Studio 5000 Integration: Uses a dedicated Add-On Profile for configuring the linking device and its field instruments.
- Field Device Integration: Allows process variables and field instrument information to be exchanged with Logix controllers.
- Industrial Network Diagnostics: Supports communication monitoring and troubleshooting through the linking device’s diagnostic capabilities.
Product Working Principle
The 1788-EN2FFR operates as a communication gateway between EtherNet/IP and FOUNDATION Fieldbus H1. It manages the exchange of information between the controller-level Ethernet network and the field-level instrumentation network.
Its operation involves several stages.
1. EtherNet/IP Communication
The device connects to the EtherNet/IP network through its two Ethernet ports. It exchanges controller information and supports the selected Ethernet network topology.
2. FOUNDATION Fieldbus H1 Communication
On the fieldbus side, the two hardware ports provide physical connections to the H1 segment. Although there are two connection points, they belong to the same logical fieldbus segment rather than representing two independent H1 networks.
3. Process Data Exchange
The linking device manages communication between EtherNet/IP and H1. Process variables and field instrument information are made available to the Logix controller through the configured communication structure.
4. Fieldbus Power Conditioning
The integrated power conditioner supplies conditioned DC power to the H1 network. This prevents the digital communication signal from interfering with the DC power supply and eliminates the need for a separate external fieldbus conditioner in supported arrangements.
5. Communication Scheduling
The device includes Link Active Scheduler functionality. The LAS coordinates scheduled communication activities on the FOUNDATION Fieldbus segment, allowing connected instruments to exchange process information according to the configured communication schedule.
A simplified network arrangement is:
ControlLogix Controller → EtherNet/IP Network → 1788-EN2FFR → FOUNDATION Fieldbus H1 → Field Instruments
The 1788-EN2FFR supports H1 communication and does not provide a High-Speed Ethernet (HSE) interface.
Role in Allen-Bradley EtherNet/IP and FOUNDATION Fieldbus Control Architecture
Within an Allen-Bradley process automation system, the 1788-EN2FFR serves as the communication interface between EtherNet/IP-based controllers and FOUNDATION Fieldbus process instrumentation.
The EtherNet/IP network carries controller information, while the H1 network connects field-level devices such as pressure transmitters, temperature transmitters, flowmeters, and valve positioners.
The linking device allows these instruments to participate in the control architecture without requiring a separate H1-to-DP gateway.
| System Component | Function |
|---|---|
| 1788-EN2FFR | Connects EtherNet/IP with FOUNDATION Fieldbus H1 |
| ControlLogix Controller | Executes process control and automation logic |
| 1756-EN2T | Provides EtherNet/IP communication for ControlLogix systems |
| 1756-EN2TR | Provides two-port EtherNet/IP communication with DLR support |
| EtherNet/IP Network | Transfers controller and process information |
| FOUNDATION Fieldbus H1 Cable | Connects field instruments to the linking device |
| 1788-FBJB4R | Provides redundant FOUNDATION Fieldbus junction connections |
| 1788-FBJB6 | Provides multiple field instrument connections |
| FOUNDATION Fieldbus Transmitters | Measure pressure, temperature, flow, and other process variables |
| FOUNDATION Fieldbus Positioners | Receive valve positioning commands |
| 24V DC Power Supply | Supplies operating power to the linking device and H1 segment |
Industrial Applications
The 1788-EN2FFR is suitable for process automation installations where FOUNDATION Fieldbus instruments need to communicate with EtherNet/IP-based control systems.
| Industrial Application | Typical Use |
|---|---|
| Oil and Gas | Integrating FOUNDATION Fieldbus pressure and flow transmitters |
| Petrochemical Processing | Connecting distributed process instrumentation |
| Chemical Manufacturing | Collecting temperature, pressure, and flow measurements |
| Power Generation | Integrating field instruments into plant control networks |
| Water Treatment | Connecting process measurement and control equipment |
| Pharmaceutical Manufacturing | Supporting communication with process instrumentation |
| Pulp and Paper | Integrating fieldbus transmitters into distributed control systems |
| Food and Beverage | Connecting process measurement and valve control instruments |
| Refining Operations | Linking field instruments with centralized control systems |
| Industrial Utilities | Supporting distributed process monitoring |
Installation and Maintenance
- Verify the Model Number: Confirm that 1788-EN2FFR is the required EtherNet/IP to FOUNDATION Fieldbus H1 linking device.
- Check Power Requirements: Prepare a suitable 24–32V DC power supply capable of meeting the specified input requirements.
- Inspect the Device: Examine the Ethernet connectors, fieldbus terminals, power connections, and housing for visible damage.
- Prepare the Installation Location: Select a suitable control cabinet location with sufficient ventilation and access for field wiring.
- Mount the Linking Device: Install the unit according to the manufacturer’s mounting instructions.
- Connect EtherNet/IP Media: Connect the Ethernet cables to the designated ports and verify that the network topology matches the system design.
- Connect FOUNDATION Fieldbus Wiring: Connect the H1 segment to the appropriate hardware ports, observing the specified wiring and polarity requirements.
- Check Fieldbus Topology: Verify that the selected ring, split, or redundant trunk arrangement follows the fieldbus network design.
- Connect the DC Power Supply: Wire the external 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 linking device and connected field instruments.
- Verify Network Communication: Check the Ethernet and fieldbus status indicators and confirm that the controller can communicate with the configured H1 devices.
- Perform Routine Inspection: Periodically inspect the Ethernet connections, fieldbus wiring, power terminals, grounding, and communication status for signs of deterioration or faults.
Compatible System Components
| Component | Function |
|---|---|
| Allen-Bradley 1788-EN2FFR | EtherNet/IP to FOUNDATION Fieldbus H1 Linking Device |
| Allen-Bradley 1788-CN2FFR | ControlNet 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-EN2T | ControlLogix EtherNet/IP Bridge Module |
| Allen-Bradley 1756-EN2TR | ControlLogix Two-Port EtherNet/IP Bridge Module |
| Allen-Bradley ControlLogix Controller | Executes process control logic |
| FOUNDATION Fieldbus H1 Instruments | Process measurement and control devices |
| 24V DC Power Supply | External operating power source |
Recommended Related Models
| Model | Product Type | Application |
|---|---|---|
| Allen-Bradley 1788-CN2FFR | ControlNet to FOUNDATION Fieldbus H1 Linking Device | ControlNet to FOUNDATION Fieldbus integration |
| Allen-Bradley 1788-EN2PAR | EtherNet/IP to PROFIBUS-PA Linking Device | EtherNet/IP to PROFIBUS-PA integration |
| Allen-Bradley 1788-CN2PAR | ControlNet to PROFIBUS-PA Linking Device | ControlNet 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-EN2TR | ControlLogix Two-Port EtherNet/IP Bridge Module | EtherNet/IP network connectivity |
Key Advantages
- Connects EtherNet/IP controllers with FOUNDATION Fieldbus H1 instruments.
- Supports up to 16 field devices on one H1 segment.
- Provides two physical H1 connection ports.
- Includes integrated fieldbus power conditioning.
- Supports multiple fieldbus media topologies.
- Provides built-in Link Active Scheduler functionality.
- Integrates with Studio 5000 Logix Designer.
Technical FAQs
1. How many FOUNDATION Fieldbus devices can the 1788-EN2FFR support?
The 1788-EN2FFR supports up to 16 field devices on a single FOUNDATION Fieldbus H1 segment. The actual number used should also account for cable length, device current consumption, and network design requirements.
2. Are the two H1 ports on the 1788-EN2FFR independent fieldbus networks?
No. The two hardware ports are divided connection points belonging to the same logical H1 segment. They should be treated as part of one fieldbus network when planning device connections and network topology.
3. Does the 1788-EN2FFR require an external FOUNDATION Fieldbus power conditioner?
No. The device incorporates built-in fieldbus power conditioning. A standard 24–32V DC power supply is used to power the linking device and the H1 segment.
4. What is the difference between 1788-EN2FFR and 1788-CN2FFR?
The 1788-EN2FFR connects an EtherNet/IP network to FOUNDATION Fieldbus H1, whereas the 1788-CN2FFR connects a ControlNet network to FOUNDATION Fieldbus H1. Both support up to 16 H1 field devices and include integrated fieldbus power conditioning, but their controller-side communication interfaces are different.