1756-CN2R

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-CN2R

Type

ControlNet interface module

Application

Communication module

Used with

ControlLogix 1756 chassis

Communication

ControlNet

Connection Cables

1 m Tap

Number Of Channels

2

Conducted RF immunity

10V rms with 1 kHz sine-wave 80% AM from 150 kHz...80 MHz

Connections supported, max

131 maximum

ControlNet cable

1786-RG6 quad shield RG6 coaxial cable

ControlNet port

2 ControlNet BNC

Current draw

1300mA @ 5.1V DC, 3mA @ 24V DC

EFT/B immunity

±3kV @ 5kHz on ControlNet ports

Emissions

CISPR 11: Class A

Enclosure type rating

None (open-style)

ESD immunity

6 kV contact discharges, 8 kV air discharges

Isolation voltage

Standard: 30V (continuous), basic insulation type, ControlNet network to, backplane, Redundant: 30V (continuous), basic insulation type, ControlNet A/B to, backplane, and ControlNet A to ControlNet B, USB to backplane and USB to ControlNet, No isolation b

Logix communication connections

128

Module location

Chassis based, any slot

Number of nodes, max

99 nodes

Operating temperature

0 to 60 °C

Power dissipation

6.7 W

Radiated RF immunity

10 V/m with 1 kHz sine-wave 80% AM from 80...2000 MHz, 10 V/m with 200 Hz 50% Pulse 100% AM @ 900 MHz, 10 V/m with 200 Hz 50% Pulse 100% AM @ 1890 MHz, 3 V/m with 1 kHz sine-wave 80% AM from 2000...2700 MHz

Redundancy

Yes

Relative humidity

5...95% noncondensing

Shock

Operating: 30 G, Nonoperating: 30 G

Slot width

1

Storage temperature

-40 to 85 °C

Supporting protocol for other bus systems

Yes

Technical documents (1)

• Rockwell Automation technical data 1756-TD003

Key features

• Redundant ControlNet interface with two BNC ports
• Chassis based module, any slot, one slot wide
• Transmission rate of 5000 kbps
• Supports up to 99 nodes on the network
• Operating temperature range of 0 to 60 °C

About the Allen-Bradley 1756-CN2R

The Allen-Bradley 1756-CN2R is listed by Rockwell Automation as a ControlLogix Communication Module, described as a ControlNet Redundant Interface Module (100 connections). Rockwell gives its lifecycle status as Active Mature. Rockwell's product data lists 2 ControlNet BNC ports, a transmission rate of 5000 kbps, a maximum of 99 nodes and 128 Logix communication connections. It draws 1300mA at 5.1V DC, dissipates 6.7 W and has an operating temperature of 0 to 60 °C.

What is the 1756-CN2R used for?

The module provides ControlNet communication for a ControlLogix chassis and can be fitted in any slot. Rockwell lists redundancy support and names 1786-RG6 quad shield RG6 coaxial cable as the ControlNet cable. It is used where a ControlLogix controller must exchange data with other devices over a ControlNet network.

Lifecycle and successor

Active.

Before you order

What to photograph or confirm so the right unit is quoted.

Check that the catalog number on the module label reads 1756-CN2R, and note the series letter and firmware revision shown on the same label. Send us a photo of the label if you need help confirming the part.