1756-CN2RK

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-CN2RK

Type

Communication module

Application

Communication module

Used with

ControlLogix 1756 chassis

Communication

ControlNet

Conformal coating

Yes

Connection Cables

1 m Tap

Interface

2 ControlNet BNC's

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 be

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

Technical documents (1)

• Rockwell Automation technical data 1756-TD003

Key features

• 2 ControlNet BNC ports
• ControlNet cable: 1786-RG6 quad shield RG6 coaxial cable
• Redundancy: Yes
• Current draw 1300mA @ 5.1V DC, 3mA @ 24V DC
• Fits any slot of a 1756 chassis

About the Allen-Bradley 1756-CN2RK

The Allen-Bradley 1756-CN2RK is a ControlLogix communication module for ControlNet, with 2 ControlNet BNC ports and conformal coating. Rockwell's product page gives it 128 Logix communication connections, 99 nodes and a current draw of 1300mA @ 5.1V DC, 3mA @ 24V DC. Rockwell Automation lists it as Active Mature.

What is the 1756-CN2RK used for?

The 1756-CN2RK connects a ControlLogix chassis to a ControlNet network, for I/O, messaging and links between controllers.

Lifecycle and successor

Active.

Before you order

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

Check the catalog number 1756-CN2RK on the module's label, with the series letter and firmware revision. Send us a photo of the label and we will confirm the details before quoting.