1768-CNB Rockwell Automation Communication Module CompactLogix

System Overview & Engineering Architecture

The 1768-CNB module operates as a dedicated ControlNet communication interface engineered by Allen-Bradley (Rockwell Automation). Designed for the CompactLogix series, this Communication Interface facilitates high-speed, deterministic data exchange across demanding industrial networks.

Technical Parameter Breakdown

• Manufacturer & Brand: Rockwell Automation / Allen-Bradley
• Product Series & Type: CompactLogix / Communication Interface
• Catalog Number: 1768-CNB
• Network Speed & Node Limit: 5 Mbps communication rate supporting up to 99 network nodes
• Connection Capacity: Maximum of 48 active system connections
• Electrical Draw & Dissipation: 1.0 Amp at 5V DC backplane current; 5.14 Watts power consumption (17.5 BTU/hr thermal output)
• Isolation & Environmental Limits: 30 Volts isolation rating; operating thermal band of 0 to 60 degrees Celsius (storage range -40 to 85 degrees Celsius)
• Physical Dimensions & Weight: 132 x 56.7 x 105.1 mm (5.20 x 2.23 x 4.12 inches); 0.260 kg (0.57 lbs)
• Physical Ports & Mounting: 1 BNC connector for standard media, 1 RJ45 shielded NAP port; mounts via DIN rail, direct panel, or 1768 chassis

Industrial Applications & Target Hardware

Engineered for mission-critical industrial architectures, the 1768-CNB is widely deployed in media redundancy networks, intrinsic safety loops, high-speed discrete manufacturing systems, and redundant controller setups utilizing CompactLogix PAC frameworks.

Diagnostic Capabilities & Operational Indicators

The module relies on onboard status LEDs and direct network management tools accessed via the RJ45 NAP port. Engineers can evaluate token rotation, monitor communication health, check node response rates, and identify physical layer degradation or packet collisions instantly.

Global PLC Spare HUB's Insight

Our automation engineering team highlights that ControlNet installations require meticulous attention to physical cable impedance and proper BNC termination to prevent reflection issues at 5 Mbps.

Field Experience Example: A continuous material handling plant experienced recurring network dropouts during peak shift operations. Replacing an aging bus adapter with a genuine 1768-CNB module and re-certifying the coaxial trunk lines restored continuous data flow and eliminated node timeout faults.

Logistics, Global Fulfillment & Warranty Terms

• Fulfillment Carriers: Express international dispatch via FedEx, UPS, and DHL.
• Handling Time: Guaranteed order processing and dispatch within 24 to 48 hours.
• Package Contents: One 1768-CNB module and standard manufacturer documentation.
• Warranty Policy: Protected by a comprehensive 12-month operational warranty.

Frequently Asked Questions & Expert Buying Guide

Q: Which chassis slots are compatible with the 1768-CNB module?

A: The module requires a single slot width and can be installed in any available slot (slots 1 through 4) on a 1768 CompactLogix chassis.

Q: What is the exact function of the RJ45 NAP connector on this module?

A: The Network Access Port (NAP) is a shielded 8-pin RJ45 interface used for temporary programming, troubleshooting, and network configuration via a PC.

Q: What certifications does this communication interface carry?

A: The module complies with major global standards, holding c-UL-us, CE, C-Tick, and CI industrial safety and quality certifications.

Q: What key factors should I weigh when purchasing a replacement communication module?

A: Confirm that your controller architecture belongs to the CompactLogix family, verify your backplane power supply can accommodate the 1.0 Amp load, and ensure your network requirements fall within the 48-connection ceiling.

Q: How do environmental shock and vibration ratings affect installation?

A: The module features an operating shock rating of 30g and a vibration tolerance of 5g at 10 to 500 Hz, making it structurally robust for heavy-duty factory floor environments when mounted securely on a DIN rail or panel.

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