1756-CNBR

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-CNBR

Type

ControlNet communication module

Application

Communication module

Used with

ControlLogix 1756 chassis

Communication

ControlNet

Connection Cables

1 m Tap

Interface

1

Conducted RF immunity

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

Connections supported, max

64 maximum

ControlNet cable

1786-RG6 quad shield RG6 coaxial cable

ControlNet port

2 ControlNet BNC

Current draw

970mA @ 5.1V DC, 1.7mA @ 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 range

40...48

Module location

Chassis based, any slot

NAP cable

1786-CP

NAP port

1 NAP RJ45

Number of nodes, max

99 nodes

Operating temperature

0 to 60 °C

Power dissipation

5.1 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, Non operating: 50 G

Slot width

1

Technical documents (1)

• Rockwell Automation technical data 1756-TD003

Key features

• Two ControlNet BNC ports plus one NAP RJ45 port
• Redundancy supported, according to Rockwell's product data
• Up to 99 nodes and 64 connections
• Chassis based, any slot, one slot wide
• Operating temperature range of 0 to 60 °C

About the Allen-Bradley 1756-CNBR

The Allen-Bradley 1756-CNBR is listed by Rockwell Automation as a ControlLogix Communication Module for ControlNet. Rockwell's product data gives a transmission rate of 5000 kbps, a maximum of 99 nodes and a maximum of 64 connections supported. It has two ControlNet BNC ports and one NAP RJ45 port, and Rockwell lists a current draw of 970mA @ 5.1V DC and 1.7mA @ 24V DC. Rockwell shows the lifecycle status as Discontinued and names the 1756-CN2R as its replacement, in the category Engineering Replacement.

What is the 1756-CNBR used for?

The module connects a ControlLogix chassis to a ControlNet network. Rockwell lists it as chassis based, fitting any slot and taking one slot width, with redundancy supported. It is used where a ControlLogix controller needs to communicate with other devices over ControlNet.

Lifecycle and successor

Discontinued.

OEM successor: 1756-CN2R

Before you order

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

Check the catalog number 1756-CNBR on the module label, together with the series letter and firmware revision. Send a photo of the label if you need help confirming the part.