1788-CN2DN Allen-Bradley

1788-CN2DN Allen-Bradley I / O module

Product  Description：

The Allen-Bradley 1788-CN2DN is a specialized linking device designed to bridge two distinct industrial networks: ControlNet and DeviceNet. Developed by Rockwell Automation, this module acts as a gateway that allows a ControlNet scanner or controller to communicate directly with devices located on a DeviceNet sub-network. It effectively translates data packets between the high-speed, deterministic ControlNet protocol and the cost-effective, device-level DeviceNet protocol, enabling seamless integration across different layers of an automation architecture.

Product Specifications

The 1788-CN2DN is engineered for industrial environments and features specific technical parameters to ensure performance and compatibility. It operates with a dual network interface, featuring one ControlNet port and one DeviceNet port. The DeviceNet side supports standard data rates of 125 kbps, 250 kbps, and 500 kbps, with automatic baud rate detection capabilities. On the ControlNet side, it adheres to the standard 5 Mbps fixed communication rate. The device requires a power supply of 24V DC typically drawn from the DeviceNet network for its internal circuitry. It supports up to 64 DeviceNet nodes and can handle a maximum of 500 bytes of input data and 492 bytes of output data per scan. The physical housing is compact and designed for DIN rail mounting, with an environmental protection rating of IP20.

Product Advantages

One of the primary advantages of the 1788-CN2DN is its ability to reduce system complexity by eliminating the need for a dedicated controller on the DeviceNet layer. By linking the networks directly, users can centralize their control logic within a ControlLogix or similar high-level controller while still utilizing inexpensive DeviceNet sensors and actuators. The device provides a deterministic data exchange, ensuring that critical information reaches the controller within a predictable timeframe, which is a hallmark of the ControlNet protocol. Furthermore, its "plug-and-play" nature within the Rockwell ecosystem means it is easily configured using standard software tools like RSNetWorx, significantly reducing engineering time during the commissioning phase.

Important Considerations and Precautions

When implementing the 1788-CN2DN, several precautions must be observed to ensure system stability. First, users must ensure that the total power consumption of the devices on the DeviceNet network does not exceed the capacity of the power supply, as the linking device itself relies on this power. It is crucial to verify that the ControlNet network is properly terminated at both ends with 75-ohm terminators and that the DeviceNet network has the required 121-ohm terminators to prevent signal reflection. Because this is an IP20-rated device, it must be installed in a protected industrial enclosure to avoid exposure to moisture, conductive dust, or corrosive chemicals. Additionally, users should be aware that the 1788-CN2DN is a legacy product; while it is highly reliable, new system designs may benefit from more modern EtherNet/IP-based linking devices depending on the existing infrastructure.

Product Applications

The 1788-CN2DN is primarily used in large-scale automation systems where a high-level ControlNet backbone is already established but requires connection to localized machine-level devices. Common applications include automotive assembly lines, where multiple DeviceNet-equipped robots or conveyor sensors need to report back to a centralized ControlLogix rack over a long-distance ControlNet run. It is also frequently found in the food and beverage industry for packaging and bottling lines, as well as in material handling facilities where it integrates distributed I/O, motor starters, and simple operator interfaces into the broader plant-wide control system without requiring expensive cabling for every individual device.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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Our main products include DCS control system spare parts, PLC system spare parts, and robot system spare parts. Our advantageous brands include Allen Bradley, Bently Nevada, ABB, HIMA, Reliance, Bender, National Instruments, Emerson Ovation, Honeywell, Siemens, Allen Bradley, ICS Triplex, FOXBORO, Schneider, GE Fanuc, Motorola, HIMA, Prosoft, and other imported industrial components. Our main products serve a wide range of electronic, metallurgical, chemical, and power plants Industries such as steel mills, rubber, cement, machinery and equipment, and construction.