1756-CNB/D Allen-Bradley ControlLogix Bridge Module

Product Description

Configured for ControlNet network communication in ControlLogix systems, the Allen-Bradley 1756-CNB/D (1756-CNB Bridge Module) provides direct data communication between ControlLogix chassis devices and ControlNet networks.

Hardware Specifications

ControlLogix Backplane and Network Communication Features

The Allen-Bradley 1756-CNB/D operates as a ControlNet bridge module within the ControlLogix platform. It transfers scheduled and unscheduled data between the ControlNet network and the ControlLogix backplane.

Furthermore, the module supports a ControlNet communication rate of 5 megabits per second and manages up to 99 network nodes with a maximum of 64 active connections. The module design supports I/O density scaling through the ControlLogix chassis architecture.

In addition, the module provides deterministic network communication functions required for PLC data exchange, remote I/O communication, and controller-to-controller messaging. The ControlNet interface maintains synchronized communication timing across connected devices.

Frequently Asked Questions

Q: What is the primary function of the Allen-Bradley 1756-CNB/D module?
A: The 1756-CNB/D functions as a ControlNet communication bridge module, providing communication between ControlNet networks and ControlLogix chassis backplane devices.

Q: What ControlNet network capacity does the 1756-CNB/D support?
A: The module supports up to 99 ControlNet nodes and a maximum of 64 communication connections.

Q: What power requirements must be considered during installation?
A: The module requires 970 mA at 5.1 VDC and 1.7 mA at 24 VDC input current according to the provided specifications. The chassis power supply must support the module load.

Field Installation Guidelines

Install the 1756-CNB/D module in a compatible ControlLogix chassis slot according to the system hardware configuration.

Verify that the ControlNet coaxial network connections maintain proper shielding and grounding practices. Keep communication cables separated from high-voltage power wiring to reduce electrical interference.

Before commissioning, confirm the module firmware compatibility with the ControlLogix controller and network configuration tools. Check node addressing, communication parameters, and scheduled connection settings before placing the system into operation.

Follow standard ESD protection procedures when handling the module. Ensure that the chassis backplane connector remains clean and properly seated during installation.

Other Attributes

• Series: Allen-Bradley ControlLogix
• Country of Origin:  USA
• Lead Time: In Stock, 2 Working Days

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