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- Allen Bradley
- 1788-EN2PAR
- Linking Device
- USA
- 152 × 80 × 136 mm
- 0.54 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Allen Bradley 1788-EN2PAR is a redundant EtherNet/IP to PROFIBUS-PA Linking Device designed to connect Allen-Bradley Logix automation systems with PROFIBUS-PA process instrumentation. It belongs to the Bulletin 1788 Linking Devices family and functions as a communication gateway between the Ethernet-based controller network and field-level process devices.
The device provides two Ethernet ports for EtherNet/IP communication and two PROFIBUS-PA physical connection ports. It supports redundant Ethernet network arrangements through its integrated Device Level Ring (DLR) functionality, as well as redundant PA media configurations.
An important feature of the 1788-EN2PAR is its integrated PROFIBUS-PA power conditioning. Each PA port supports up to 500 mA, allowing the device to supply conditioned power to connected field instruments without requiring separate external power conditioners in supported configurations.
The linking device supports up to 24 PROFIBUS-PA field devices and provides a built-in display for monitoring network conditions, fieldbus voltage, current, and communication diagnostics.
Configuration is performed through Studio 5000 Logix Designer using the dedicated Add-On Profile (AOP). It also supports field device configuration and diagnostics through FDT/DTM technology.
The 1788-EN2PAR is particularly useful in process automation installations where PROFIBUS-PA instrumentation needs to communicate with EtherNet/IP-based control systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley |
| Brand Owner | Rockwell Automation |
| Model | 1788-EN2PAR |
| Product Series | Bulletin 1788 Linking Devices |
| Product Type | EtherNet/IP to PROFIBUS-PA Linking Device |
| Official Product Designation | Redundant EtherNet/IP to PROFIBUS-PA Linking Device |
| Controller Network | EtherNet/IP |
| Fieldbus Protocol | PROFIBUS-PA |
| Ethernet Ports | 2 |
| Ethernet Cable Type | CAT5 STP/UTP |
| Ethernet Redundancy | Device Level Ring (DLR) |
| PROFIBUS-PA Ports | 2 Physical Ports |
| Maximum Field Devices | 24 |
| PA Port Current Capacity | 500 mA per Port |
| Power Supply Input | 24–32V DC, 0.75 A |
| PA Power Output | 0.5 A at 24V DC, Single Trunk |
| PA Power Output | 0.4 A at 24V DC, Dual Trunk |
| Power Conditioning | Built-in |
| 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 |
| Configuration Software | Studio 5000 Logix Designer |
| Configuration Interface | Add-On Profile (AOP) |
| Device Diagnostics | FDT/DTM Support and Built-in Display |
| Enclosure Type | Open-Style |
| Operating Temperature | 0–60°C |
| Relative Humidity | 5–95%, non-condensing |
| Dimensions | 152 × 80 × 136 mm |
| Weight | 0.54 kg |
Product Features
- EtherNet/IP-to-PROFIBUS-PA Integration: Establishes communication between EtherNet/IP controllers and PROFIBUS-PA field instrumentation.
- Dual Ethernet Ports: Provides two Ethernet connections for industrial network integration.
- DLR Network Support: Supports Device Level Ring topology for EtherNet/IP network redundancy.
- Dual PA Ports: Provides two physical PROFIBUS-PA connections for supported fieldbus configurations.
- 24-Device Capacity: Supports up to 24 PROFIBUS-PA field devices.
- Integrated Power Conditioning: Supplies conditioned power to the PA network without requiring an additional external power conditioner.
- 500 mA Port Capacity: Provides the specified current capacity for each PA port.
- Multiple PA Topologies: Supports redundant and non-redundant PROFIBUS-PA media arrangements.
- Studio 5000 Integration: Uses a dedicated Add-On Profile for controller configuration and data integration.
- Built-in Diagnostic Display: Displays network status, PA voltage, current, temperature, and communication information.
- FDT/DTM Compatibility: Supports field device configuration and diagnostic access through compatible tools.
Product Working Principle
The 1788-EN2PAR operates as a communication gateway between EtherNet/IP and PROFIBUS-PA. It manages the exchange of process information between the Logix controller and connected field instruments.
Its operation involves several stages.
1. EtherNet/IP Communication
The device connects to the industrial Ethernet network through its two Ethernet ports. It communicates with the controller and supports Device Level Ring arrangements for Ethernet network redundancy.
2. PROFIBUS-PA Communication
On the fieldbus side, the device provides two physical PA ports for connecting process instruments. These connections support the selected PROFIBUS-PA trunk and redundancy arrangement.
3. Process Data Exchange
The linking device transfers field instrument information between PROFIBUS-PA and EtherNet/IP. Process variables, device status, and diagnostic information can be made available to the Logix controller through the configured communication structure.
4. Fieldbus Power Conditioning
The integrated power conditioners supply conditioned DC power to the PROFIBUS-PA network. This allows power and digital communication signals to share the fieldbus wiring.
5. Field Device Configuration
The device supports FDT/DTM-based field device access. Maintenance personnel can use compatible configuration tools to inspect instrument parameters and retrieve diagnostic information.
A simplified network arrangement is:
ControlLogix Controller → EtherNet/IP Network → 1788-EN2PAR → PROFIBUS-PA Network → Process Instruments
The linking device manages the communication interface and fieldbus power conditioning rather than executing the main process control algorithms.
Role in Allen-Bradley EtherNet/IP and PROFIBUS-PA Control Architecture
Within an Allen-Bradley process automation system, the 1788-EN2PAR provides the communication connection between EtherNet/IP-based controllers and PROFIBUS-PA field instrumentation.
EtherNet/IP handles controller-level communication, while PROFIBUS-PA connects process instruments such as pressure transmitters, flowmeters, temperature sensors, and valve positioners.
The linking device allows these field instruments to communicate with the Logix controller without requiring an intermediate PROFIBUS-DP network.
| System Component | Function |
|---|---|
| 1788-EN2PAR | Connects EtherNet/IP with PROFIBUS-PA |
| 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 |
| PROFIBUS-PA Trunk Cable | Connects field instruments to the linking device |
| 1788-FBJB4R | Provides redundant PROFIBUS-PA junction connections |
| 1788-FBJB6 | Provides multiple PROFIBUS-PA field device connections |
| PROFIBUS-PA Transmitters | Measure pressure, temperature, and flow |
| PROFIBUS-PA Positioners | Receive valve positioning commands |
| 24V DC Power Supply | Supplies operating power to the linking device |
Industrial Applications
The 1788-EN2PAR is suitable for process industries where PROFIBUS-PA instrumentation needs to communicate with EtherNet/IP-based automation systems.
| Industrial Application | Typical Use |
|---|---|
| Oil and Gas | Integrating 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 PROFIBUS-PA measurement devices |
| Pharmaceutical Manufacturing | Supporting process instrument communication |
| Pulp and Paper | Integrating fieldbus transmitters into process control systems |
| Food and Beverage | Connecting process measurement and valve control instruments |
| Refining Operations | Linking field instruments with centralized controllers |
| Industrial Utilities | Supporting distributed process monitoring |
Installation and Maintenance
- Verify the Model Number: Confirm that 1788-EN2PAR is the required EtherNet/IP to PROFIBUS-PA linking device.
- Check Power Requirements: Prepare a suitable 24–32V DC power supply that meets the specified input requirements.
- Inspect the Device: Examine the Ethernet connectors, PA terminals, power connections, display, and housing for visible damage.
- Prepare the Installation Location: Select a suitable control cabinet location with adequate 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 configure the DLR network arrangement where required.
- Connect PROFIBUS-PA Wiring: Connect the PA trunk wiring to the designated ports, observing the correct wiring and polarity requirements.
- Check PA Network Topology: Verify the selected single or redundant trunk arrangement and ensure that the field device connections match the network design.
- Connect the DC Power Supply: Wire the external 24–32V DC supply to the designated power terminals and verify polarity.
- 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 display, Ethernet status, PA communication status, and controller diagnostics to confirm correct operation.
- Perform Routine Inspection: Periodically inspect the Ethernet connections, PA wiring, power terminals, grounding, and diagnostic indicators for signs of deterioration or communication faults.
Compatible System Components
| Component | Function |
|---|---|
| Allen-Bradley 1788-EN2PAR | EtherNet/IP to PROFIBUS-PA Linking Device |
| Allen-Bradley 1788-CN2PAR | ControlNet to PROFIBUS-PA 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 |
| PROFIBUS-PA Field Instruments | Process measurement and control devices |
| 24V DC Power Supply | External operating power source |
Recommended Related Models
| Model | Product Type | Application |
|---|---|---|
| Allen-Bradley 1788-CN2PAR | ControlNet to PROFIBUS-PA Linking Device | ControlNet to PROFIBUS-PA integration |
| Allen-Bradley 1788-EN2FFR | EtherNet/IP to FOUNDATION Fieldbus H1 Linking Device | EtherNet/IP to FOUNDATION Fieldbus integration |
| Allen-Bradley 1788-CN2FFR | ControlNet to FOUNDATION Fieldbus H1 Linking Device | ControlNet to FOUNDATION Fieldbus integration |
| Allen-Bradley 1788-FBJB4R | 4-Way Redundant Intelligent Fieldbus Junction Box | Redundant fieldbus connections |
| Allen-Bradley 1788-FBJB6 | 6-Way Intelligent Fieldbus Junction Box | Multiple field instrument connections |
| Allen-Bradley 1756-EN2TR | ControlLogix Two-Port EtherNet/IP Bridge Module | EtherNet/IP network connectivity |
Key Advantages
- Connects EtherNet/IP controllers with PROFIBUS-PA field instruments.
- Supports up to 24 field devices.
- Provides two physical PA connection ports.
- Includes integrated PROFIBUS-PA power conditioning.
- Supports Device Level Ring Ethernet redundancy.
- Supports redundant PA media arrangements.
- Provides built-in display and field device diagnostics.
- Integrates with Studio 5000 Logix Designer.
Technical FAQs
1. How many PROFIBUS-PA devices can the 1788-EN2PAR support?
The 1788-EN2PAR supports up to 24 PROFIBUS-PA field devices. The actual network configuration must also account for cable length, device current consumption, and fieldbus electrical requirements.
2. Does the 1788-EN2PAR require an external PROFIBUS-PA power conditioner?
No. The linking device incorporates built-in PA power conditioning. It supplies conditioned power to the connected fieldbus network, reducing the need for separate external power-conditioning equipment.
3. Does the 1788-EN2PAR support EtherNet/IP network redundancy?
Yes. The device supports Device Level Ring (DLR) functionality through its two Ethernet ports. This allows it to participate in supported redundant EtherNet/IP network configurations.
4. What is the difference between 1788-EN2PAR and 1788-CN2PAR?
The 1788-EN2PAR connects an EtherNet/IP network to PROFIBUS-PA, while the 1788-CN2PAR connects a ControlNet network to PROFIBUS-PA. Both devices provide fieldbus power conditioning and support PROFIBUS-PA field device integration, but their controller-side network interfaces are different.