Allen-Bradley 1788-CN2DN ControlNet to DeviceNet Bridge Linking Device

Product Description

The 1788-CN2DN is a high-performance communication interface designed to bridge the gap between ControlNet and DeviceNet networks. This linking device enables seamless data exchange and high-speed control coordination across heterogeneous network architectures. It functions as a gateway, allowing a master controller on a ControlNet segment to monitor and control I/O devices residing on a DeviceNet subnet without requiring a dedicated PC-based scanner.

As an open-style module, the 1788-CN2DN is engineered for panel-mount or DIN-rail integration within protected industrial enclosures. It features robust galvanic isolation between all ports to ensure signal integrity and protect sensitive logic-side components from field-side electrical transients.

Technical Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model Designation: 1788-CN2DN

• Network Interface A: ControlNet (BNC Coaxial RG-6 connection)

• Network Interface B: DeviceNet (5-pin linear header)

• Input Power: 24V DC nominal (Range: 18-32V DC)

• Current Consumption: 500 mA (External 24V Input) / 90 mA (from DeviceNet network)

• Isolation Voltage: 30V continuous (Basic Insulation); Factory tested at 720V DC for 60 seconds

• Wiring Specifications: 0.25 to 2.5 mm² (22 to 14 AWG) copper wire for power; 75°C (167°F) rating minimum

• Communication Wiring: Category 2 (Comms) and Category 3 (Power)

• Dimensions (H x W x D): 120 x 200 x 87 mm (4.7 x 7.9 x 3.4 in)

• Thermal Rating: T4A (North American) / T4 (IEC)

• Enclosure Rating: IP00 (Open-style)

Application and Network Integration

This linking device is primarily utilized in large-scale manufacturing facilities where a ControlNet backbone manages primary PLC communications while localized DeviceNet segments handle discrete sensors, motor starters, and actuators. By utilizing the 1788-CN2DN, engineers can reduce the complexity of their network topology and optimize bandwidth on the primary ControlNet trunk.

Engineering FAQ

How does the 1788-CN2DN handle DeviceNet power?The device requires power from both the external 24V DC input and the DeviceNet network itself. The DeviceNet side draws approximately 90 mA to power the transceiver circuits, ensuring network isolation is maintained.

Does this device support redundant ControlNet media?The 1788-CN2DN provides standard ControlNet connectivity. For mission-critical applications requiring physical media redundancy, verify if your network configuration supports a single-access linking device or if secondary modules are required for the specific segment.