Brand:Allen Bradley PLC Item No.:Allen Bradley 1768-CNB Product Origin:USA Product Dimensions:56.7 × 132 × 105.1 mm Product Weight:0.26 kg Payment:T/T, Western Union, Credit Card Goods_stock:15 Shipping Port:Xiamen, China Lead Time:1-3 Days Condition:Brand New And Original Warranty:1 Year Certificate:COO
The Allen Bradley 1768-CNB is a ControlNet communication bridge module designed for the CompactLogix L4X controller platform. It enables high-speed deterministic communication over the ControlNet network, allowing PLC systems to exchange I/O data, controller messages, and real-time process information in industrial automation environments.
This module is widely used in legacy ControlLogix/CompactLogix architectures where ControlNet remains the backbone of synchronized control systems. It is valued for its predictable network timing, multi-node capability, and stable performance in high-throughput industrial communication applications.
Popular Allen Bradley Communication & Control Products
Model
Category
1756-EN2T
Ethernet/IP communication module
1769-SDN
DeviceNet scanner module
1734-AENTR
POINT I/O EtherNet/IP adapter
1783-US8T
Industrial Ethernet switch
1756-CNB
ControlNet bridge module
1768-ENBT
CompactLogix Ethernet module
Industrial Applications
The 1768-CNB is primarily used in industrial automation systems that rely on deterministic ControlNet communication for synchronized control and high-speed data exchange.
Typical applications include:
High-speed production line synchronization
Distributed I/O control systems
Packaging and assembly automation
Process manufacturing systems
Motion-adjacent coordination systems
Legacy ControlLogix/CompactLogix networks
Multi-controller industrial communication architectures
SCADA-connected deterministic control networks
Its deterministic scheduling capability makes it suitable for systems where timing accuracy is more critical than flexible IP-based networking.
Key Advantages
Deterministic High-Speed Communication
ControlNet ensures predictable and scheduled data exchange, making it ideal for time-critical industrial control systems.
Multi-Node Network Capability
Supports up to 99 nodes, enabling large distributed automation architectures with synchronized control behavior.
Stable Legacy Network Integration
Widely used in existing installed base systems, ensuring compatibility with long-life industrial infrastructures.
Dual Interface Design
Provides both BNC trunk connection and RJ45 NAP port for convenient network configuration and diagnostics.
Reliable Industrial Performance
Engineered for continuous operation in harsh environments with strong electromagnetic immunity and stable throughput.
Technical FAQs
1. What is the 1768-CNB used for?
It is a ControlNet communication module used to connect CompactLogix controllers to ControlNet industrial networks.
2. Is ControlNet still widely used?
It is considered a legacy industrial network but still widely deployed in existing automation systems.
3. What is the communication speed of ControlNet?
The network operates at 5 Mbps with deterministic scheduled communication.
4. How many devices can it support?
It supports up to 99 nodes on a single ControlNet network.
5. How many connections does it support?
It supports up to 48 Logix communication connections.
6. Is it compatible with Ethernet/IP?
No. It is designed specifically for ControlNet networks, not Ethernet/IP.
7. What systems use the 1768-CNB?
It is used in CompactLogix L4X systems and legacy ControlLogix/CompactLogix architectures.
8. Is the module still in production?
No. It is discontinued but remains in use in installed industrial systems.
9. What makes ControlNet different from Ethernet?
ControlNet provides deterministic scheduled communication, whereas Ethernet/IP is more flexible but less timing-deterministic.
10. Why is the 1768-CNB still important?
Because many industrial plants still rely on ControlNet-based architectures for synchronized and deterministic control, making it essential for maintenance and system continuity.
