1756-CN2RK

Overview

The 1756-CN2RK is a ControlNet communication module from Allen-Bradley’s ControlLogix series, supporting redundant/non-redundant communication with two BNC ports and up to 131 network connections.

Technical Specifications

• Communication Type: ControlNet

• Number of Channels: 2

• ControlNet Ports: 2 × BNC

• Transmission Rate: 5000 kbps

• Max Supported Connections: 131

• Logix Communication Connections: 128

• Max Number of Nodes: 99

Electrical Details

• Current Draw: 1300 mA @ 5.1 VDC, 3 mA @ 24 VDC

• Power Dissipation: 6.7 W

• Thermal Dissipation: 22.9 BTU/h

• Isolation Voltage: 30 V (continuous, basic insulation type)

Interface & Cabling

• Connection Cable: 1 m Tap

• ControlNet Cable Type: 1786-RG6 quad shield coaxial

• Wiring Category: Category 1 (ControlNet ports), Category 3 (USB ports)

Environmental Specifications

• Operating Temperature: 0 to 60 °C

• Storage Temperature: -40 to 85 °C

• Relative Humidity: 5–95%, non-condensing

• Vibration Resistance: 2 G @ 10–500 Hz

• Shock (Operating/Non-operating): 30 G

EMC Compliance

• ESD Immunity: 6 kV contact, 8 kV air

• EFT/B Immunity: ±3 kV @ 5 kHz

• Surge Immunity: ±2 kV line-to-earth (CM)

• Conducted RF Immunity: 10 V rms, 150 kHz–80 MHz

• Emissions: CISPR 11 Class A

Physical Construction

• Enclosure Type: Open-style

• Conformal Coating: Yes (True)

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