ProductPRODUCT
Featured products
Contact Us
- Allen Bradley
- 1788-CN2PAR
- Linking Device
- USA
- 152 × 80 × 136 mm
- 0.57 kg
- Xiamen, China
- New & In Stock
- T/T, PayPal, Western Union
- 1 Year
- 1-3 Working Days
- DHL, UPS, TNT, FedEx and EMS.
- 24-Hour Service
- COO
- 5
Our advantage
Global Logistics
We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
Brand new and original
Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
24-hour service
We provide 7*24 hours service to our customers. We will be there whenever you need us.
Price advantage
All our products are priced very favorably because we have our own warehouse and supply.
| Company Information | |||
| [email protected] | |||
| Mobile | +8615980777398 | ||
| +8615980777398 | |||
| 15980777398 |
Product Overview
The Allen Bradley 1788-CN2PAR is a redundant ControlNet to PROFIBUS-PA Linking Device designed to integrate PROFIBUS-PA process instruments into Allen-Bradley Logix automation systems. It belongs to the Bulletin 1788 Linking Devices family and provides a direct communication connection between ControlNet and PROFIBUS-PA without requiring an intermediate PROFIBUS-DP network.
The device serves as a gateway between the controller-level network and field-level process instrumentation. On the ControlNet side, it uses two BNC connectors for single or dual ControlNet media connections. On the PROFIBUS-PA side, it provides two physical fieldbus ports, designated A and B, for connecting process instruments and supported network configurations.
One of its important features is integrated PROFIBUS-PA power conditioning. Each PA port provides up to 500 mA, allowing the linking device to supply conditioned power directly to the fieldbus network without requiring additional external power conditioners.
The 1788-CN2PAR supports up to 24 PROFIBUS-PA field devices. Its integration with Studio 5000 Logix Designer allows process variables, device status information, and diagnostic data to be accessed within the controller environment.
This makes the device particularly useful when integrating existing PROFIBUS-PA instrumentation into a ControlNet-based process control system.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley |
| Brand Owner | Rockwell Automation |
| Model | 1788-CN2PAR |
| Product Series | Bulletin 1788 Linking Devices |
| Product Type | ControlNet to PROFIBUS-PA Linking Device |
| Official Product Designation | Redundant ControlNet to PROFIBUS-PA Linking Device |
| Controller Network | ControlNet |
| Fieldbus Protocol | PROFIBUS-PA |
| ControlNet Connectors | 2 BNC Ports |
| ControlNet Media | Single or Dual ControlNet Media |
| PROFIBUS-PA Ports | 2 Physical Ports (A and B) |
| Maximum Field Devices | 24 |
| PA Port Output | 500 mA per Port |
| Power Supply Input | 24–32V DC, 0.75A |
| PA Power Output | 0.5A at 24V DC per Single Trunk |
| PA Power Output | 0.4A at 24V DC for Dual Trunk Configuration |
| 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 |
| Enclosure Type | Open-Style |
| Configuration Software | Studio 5000 Logix Designer |
| Configuration Interface | Add-On Profile (AOP) |
| Device Diagnostics | FDT/DTM Support and Built-in Web Server |
| Dimensions | 152 × 80 × 136 mm |
| Weight | 0.57 kg |
Product Features
- ControlNet-to-PROFIBUS-PA Integration: Establishes direct communication between ControlNet and PROFIBUS-PA networks without an intermediate PROFIBUS-DP layer.
- Redundant ControlNet Media: Provides two BNC connectors for single or dual ControlNet media configurations.
- Dual PROFIBUS-PA Ports: Offers two independent physical PA connections, designated A and B.
- 24-Device Capacity: Supports up to 24 PROFIBUS-PA field devices.
- Integrated Power Conditioning: Supplies conditioned power to the PA network without requiring additional external power conditioners.
- 500 mA Per Port: Provides the specified current capacity for each physical PA port.
- Studio 5000 Integration: Uses a dedicated Add-On Profile to simplify controller configuration and process variable mapping.
- Field Device Diagnostics: Supports FDT/DTM technology for accessing instrument configuration and diagnostic information.
- Built-in Display: Features a 128 × 128 pixel display for viewing network status, voltage, current, internal temperature, and field device communication quality.
- Web-Based Monitoring: Includes a built-in web server for accessing network and field device information.
Product Working Principle
The 1788-CN2PAR operates as a communication gateway between ControlNet and PROFIBUS-PA. Its main function is to exchange process data between the Logix controller and connected field instruments.
The communication process involves several stages.
1. ControlNet Communication
The linking device connects to the ControlNet network through two BNC connectors. These connections support single or dual ControlNet media arrangements, allowing the device to participate in the existing controller communication architecture.
2. PROFIBUS-PA Communication
On the fieldbus side, the device provides two physical ports, A and B. These ports connect PROFIBUS-PA instruments such as pressure transmitters, temperature transmitters, flowmeters, and valve positioners.
3. Process Data Exchange
The linking device manages communication between the controller network and the PA field devices. Process variables are transferred into the Logix controller environment through predefined data structures.
Each configured field device can provide process variables and additional status information. The controller can access these values through the configured communication connections.
4. Fieldbus Power Conditioning
The 1788-CN2PAR incorporates built-in power conditioners for the PROFIBUS-PA network. It supplies conditioned DC power to the connected PA segments while supporting communication over the same fieldbus wiring.
5. Configuration and Diagnostics
The device uses an Add-On Profile in Studio 5000 Logix Designer for configuration. Field device parameters and diagnostics can also be accessed through supported FDT/DTM tools.
A simplified network arrangement is:
ControlLogix Controller → ControlNet Network → 1788-CN2PAR → PROFIBUS-PA Network → Process Instruments
The linking device handles communication and power conditioning between the two network levels rather than performing the process control algorithms itself.
Role in Allen-Bradley ControlNet and PROFIBUS-PA Control Architecture
Within an Allen-Bradley process automation system, the 1788-CN2PAR serves as the communication interface between ControlNet-based controllers and PROFIBUS-PA field instrumentation.
ControlNet provides the controller-level communication path, while PROFIBUS-PA connects process instruments that measure and regulate operating conditions throughout the plant.
The linking device allows these field instruments to communicate with the Logix controller without requiring a separate PROFIBUS-DP network layer.
| System Component | Function |
|---|---|
| 1788-CN2PAR | Connects ControlNet with PROFIBUS-PA |
| 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 controller-side communication path |
| 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, flow, and other process variables |
| PROFIBUS-PA Positioners | Receive control commands for valve positioning |
| 24V DC Power Supply | Supplies operating power to the linking device |
The 1788-CN2PAR is particularly useful in process installations where PROFIBUS-PA instrumentation must be incorporated into an existing ControlNet-based control architecture.
Industrial Applications
The 1788-CN2PAR is suitable for process automation environments where field-level PROFIBUS-PA instruments need to exchange information with Allen-Bradley Logix controllers.
| Industrial Application | Typical Use |
|---|---|
| Oil and Gas | Integrating pressure and flow transmitters into ControlNet-based systems |
| Petrochemical Processing | Connecting distributed process instruments to central controllers |
| Chemical Manufacturing | Collecting temperature, pressure, and flow measurements |
| Power Generation | Integrating field instrumentation into plant control networks |
| Water Treatment | Connecting PROFIBUS-PA process measurement devices |
| Pharmaceutical Manufacturing | Supporting communication with process instrumentation |
| Pulp and Paper | Integrating fieldbus transmitters into distributed process control |
| Food and Beverage | Connecting process measurement and valve control instruments |
| Refining Operations | Linking field instrumentation with centralized control systems |
| Industrial Utilities | Supporting distributed measurement and process monitoring |
Installation and Maintenance
- Verify the Model Number: Confirm that 1788-CN2PAR is the required ControlNet to PROFIBUS-PA linking device.
- Check Power Requirements: Prepare a suitable 24–32V DC power supply that meets the specified electrical requirements.
- Inspect the Device: Examine the BNC connectors, PA terminals, power connections, display, and housing for visible damage.
- Prepare the Installation Location: Select a suitable control cabinet location with sufficient ventilation and protection for open-style equipment.
- Mount the Linking Device: Install the unit using the manufacturer’s specified mounting arrangement.
- Connect ControlNet Media: Connect the ControlNet coaxial cable to the appropriate BNC port. Configure single or dual media connections according to the network design.
- Connect PROFIBUS-PA Wiring: Connect the PA trunk wiring to ports A and B, observing the specified positive, negative, and shield terminal assignments.
- Check Network Topology: Verify the selected PA network arrangement and ensure that the connected field devices comply with the segment design.
- Connect the DC Power Supply: Wire the external 24–32V DC supply to the designated power terminals, observing correct polarity.
- Configure the Linking Device: Use Studio 5000 Logix Designer and the dedicated Add-On Profile to configure the device and connected PA instruments.
- Verify Network Communication: Check the display, status indicators, and controller diagnostics to confirm that the ControlNet and PROFIBUS-PA connections are operating correctly.
- Perform Routine Inspection: Periodically inspect the power connections, BNC connectors, PA wiring, grounding, and field device communication status.
Compatible System Components
| Component | Function |
|---|---|
| Allen-Bradley 1788-CN2PAR | ControlNet to PROFIBUS-PA Linking Device |
| Allen-Bradley 1788-EN2PAR | EtherNet/IP 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-CNB | ControlLogix ControlNet Bridge Module |
| Allen-Bradley 1756-CNBR | ControlLogix Redundant ControlNet 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-EN2PAR | EtherNet/IP to PROFIBUS-PA Linking Device | EtherNet/IP to PROFIBUS-PA integration |
| Allen-Bradley 1788-CN2FFR | ControlNet to FOUNDATION Fieldbus H1 Linking Device | ControlNet to FOUNDATION Fieldbus integration |
| Allen-Bradley 1788-EN2FFR | EtherNet/IP to FOUNDATION Fieldbus H1 Linking Device | EtherNet/IP to FOUNDATION Fieldbus integration |
| Allen-Bradley 1788-FBJB4R | Redundant Intelligent Fieldbus Junction Box | Redundant fieldbus connections |
| Allen-Bradley 1788-FBJB6 | Intelligent Fieldbus Junction Box | Multiple field instrument connections |
| Allen-Bradley 1756-CNBR | ControlLogix Redundant ControlNet Bridge Module | Redundant ControlNet communication |
Key Advantages
- Direct integration of ControlNet and PROFIBUS-PA networks.
- Supports up to 24 field instruments.
- Two independent PROFIBUS-PA physical ports.
- Redundant ControlNet media connectivity.
- Built-in PA power conditioning.
- Studio 5000 configuration and controller integration.
- Integrated display and web-based diagnostics.
Technical FAQs
1. How many PROFIBUS-PA field devices can the 1788-CN2PAR support?
The 1788-CN2PAR supports up to 24 PROFIBUS-PA field devices. The actual segment configuration must also account for cable length, current consumption, network topology, and fieldbus electrical requirements.
2. Does the 1788-CN2PAR require an external PROFIBUS-PA power conditioner?
No. The linking device incorporates built-in power conditioning for its PROFIBUS-PA network connections. Rockwell Automation specifies up to 500 mA per physical PA port.
3. What is the difference between 1788-CN2PAR and 1788-EN2PAR?
The 1788-CN2PAR connects PROFIBUS-PA field devices to a ControlNet network, whereas the 1788-EN2PAR provides the corresponding connection to an EtherNet/IP network. Both belong to the Bulletin 1788 PROFIBUS-PA linking device family.
4. Can the 1788-CN2PAR operate with redundant PROFIBUS-PA media?
Yes. The device supports redundant PA network configurations using its two physical ports. The appropriate trunk arrangement, junction boxes, field device connections, and configuration settings must be selected according to the system design.