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Allen Bradley ControlLogix 1756-CNB

Product image is representative; revision or series may vary. Contact us to request a specific version.

1756-CNB

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The Allen Bradley 1756-CNB functions as a ControlNet bridge module, providing high-speed communication capabilities for the ControlLogix system. It supports a network communication rate of 5 Mbps and facilitates up to 64 Logix connections, allowing integration with many devices.

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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 1756-CNB

ManufacturerAllen Bradley
Product TypeControlNet Bridge Module
Product LineControlLogix
Part Number1756-CNB
GTIN10612598174079
Weight0.56 lbs (0.26 kg)
UPC612598174072
Communication Rate5 Mbps
Max. Logix Connections64 Connections
Max. Number of Nodes99 Nodes
Backplane Voltage at 5.1V DC970 mA
Backplane Voltage at 24V DC1.7 mA
Continuous Isolation Voltage30V with basic insulation
Operating Temperature0 to 60 degrees Celsius
Temperature CodeT4 Code
Max. Surrounding Air Temperature60 degrees Celsius
Max. Relative Humidity80% RH, non-condensing

The 1756-CNB from Allen Bradley is a specialized ControlNet bridge module that enhances the flexibility and connectivity of the ControlLogix series. Capable of processing a communication rate of up to 5 Mbps, this device is engineered to optimize data transmission across the network. It allows for a maximum of 64 Logix connections, which supports extensive application configurations. Additionally, the module can connect up to 99 nodes, ensuring comprehensive integration within large systems.

With significant attention to electrical characteristics, the 1756-CNB draws 970 mA at a backplane voltage of 5.1 volts DC and only 1.7 mA at 24 volts DC, which indicates efficient power usage. The device is designed to operate within a continuous isolation voltage of 30 volts when utilizing basic insulation, making it safe for most industrial environments. Moreover, its temperature range spans from 0 to 60 degrees Celsius, with a maximum surrounding air temperature also capped at 60 degrees Celsius. The temperature code assigned to this module is T4, indicating suitable thermal characteristics.

Operating effectively in conditions of up to 80% relative humidity, the 1756-CNB adds versatility to control systems without the risk of condensation forming. This makes it ideal for various industrial applications requiring reliability and efficient communication.

Revision Part #Also known as
1756-CNB Ser A1756-CNB/A, Series A, Rev A
1756-CNB Ser B1756-CNB/B, Series B, Rev B
1756-CNB Ser C1756-CNB/C, Series C, Rev C
1756-CNB Ser D1756-CNB/D, Series D, Rev D
1756-CNB Ser E1756-CNB/E, Series E, Rev E
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