When Your ControlNet Network Needs a Reliable Interface, What Do You Reach For?
Downtime on a ControlNet segment can stall an entire production line. The Allen-Bradley 1768-CNB CompactLogix ControlNet Interface Module keeps that network running with dependable, high-speed data transfers and flexible mounting options.
This communication module belongs to the CompactLogix series and installs in any slot from 1 to 4 of a 1768 chassis. It supports up to 48 simultaneous connections and a maximum of 99 nodes, making it a practical choice for media redundancy, intrinsic safety loops, and redundant controller architectures.
Technical Specifications That Matter
| Specification | Value |
|---|---|
| Device Type | Communication Interface |
| Maximum Connections | 48 |
| Maximum Nodes | 99 |
| Slot Width | 1 Slot |
| Backplane Current | 1 ampere at 5 volts |
| Power Consumption | 5.14 Watts |
| Power Dissipation | 5.14 Watts |
| Thermal Dissipation | 17.5 BTU/hr |
| ControlNet Communication Rate | 5 Mbps |
| Isolation | 30 Volts |
| Operating Temperature | 0 to 60 degrees Celsius |
| Nonoperating Temperature | -40 to 85 degrees Celsius |
| Dimensions | 132 mm x 56.7 mm x 105.1 mm |
| Approximate Weight | 0.260 kg (0.57 lb) |
The 5 Mbps ControlNet communication rate handles high-speed data transfers across the network. With 48 connections, you can attach multiple devices without adding another interface card. The 30 Volt isolation protects the backplane from electrical noise common in oil, gas, and heavy industrial environments.
Two connectors serve this module: one BNC connector for non-redundant media operation and one NAP connector, which is an RJ45 8-pin shielded connector. This dual-connector layout supports both standard and redundant media configurations.
Where the 1768-CNB Fits in Your Operation
Oil and gas facilities often run ControlNet networks across pump stations, compressor controls, and safety instrumented systems. The 1768-CNB handles intrinsic safety applications and media redundancy where a single cable fault cannot stop production.
In manufacturing, this module links CompactLogix controllers to drives, remote I/O, and operator interfaces. The 99-node capacity means you can build a large network without cascading multiple interface modules.
For redundant controller systems, the 1768-CNB supports the data synchronization that keeps primary and backup processors aligned. When one controller goes down, the other takes over without losing network communication.
Installation and Mounting Options
Mount the 1768-CNB on a DIN rail or panel, or seat it directly in a 1768 ControlLogix chassis. The module occupies one slot and can go into any slot from 1 to 4. Its operating temperature range of 0 to 60 degrees Celsius suits most control rooms and cabinets.
The module tolerates vibration of 5 g at 10 to 500 Hz and operating shock of 30 g. Nonoperating shock reaches 50 g. These ratings matter in oil fields and heavy manufacturing where equipment sees constant movement.
Relative humidity from 5% to 95% noncondensing keeps the module reliable in humid climates. For storage or shipping, the nonoperating range extends from -40 to 85 degrees Celsius.
Integration and Compatibility
The 1768-CNB communicates over the ControlNet network at 5 Mbps. It works with CompactLogix controllers and 1768 chassis systems. The BNC and NAP connectors link to standard ControlNet cabling.
Integration Note
Wiring into a ControlNet network may require specific cables or connection modules. Confirm cable types and any gateway requirements with your supplier before installation.
Selection Checklist Before You Buy
Verify your chassis has an open slot from 1 to 4. Check that your ControlNet network operates at 5 Mbps. Confirm your power budget covers 1 ampere at 5 volts and 5.14 Watts per module.
If you run redundant media or intrinsic safety loops, the 1768-CNB is built for those applications. Oil AutoTech provides hands-on technical selection help to match this module to your existing CompactLogix setup.
Please verify current lifecycle status and availability with Oil AutoTech before ordering. Contact Oil AutoTech today for pricing and availability.
