Skip to content
Free Ground Shipping | Overnight Shipping Available | Texas-based company, and all shipments come from the USA
(833) 800-7748

1756-CN2R Allen-Bradley

Original price $599.97 - Original price $632.47
Original price
$599.97
$599.97 - $632.47
Current price $599.97
Surplus - Tested (With Warranty)
Need a Specific Revision?
$599.97
7 in stock
New / Open-Box Surplus
Need a Specific Revision?
$632.47
5 in stock
Ships today if ordered by 1 PM CST
Overnight shipping available
Qty Available: (7) ✓ Verified Stock every 24hrs
Questions? (833) 800-7748

All products listed are sold by PLC Department, an independent supplier — not an authorized Allen Bradley distributor. Covered by our 1-year warranty. By purchasing you acknowledge our full disclaimer. Read & agree ↓

Ships from Texas, USA
Same-day by 1 PM CST
Tested & inspected
Every unit, before it ships
1-year warranty
Backed direct by us
30-day returns
Hassle-free RMA
Stock verified / 24 hrs
Real-time availability
Photos on request
Your exact unit, ~5 min
Trusted By

Product Details

Description · Specifications · Product Overview

Specifications provided for reference. Verify critical details against official manufacturer documentation before installation.

Product Overview

The 1756-CN2R is an Allen-Bradley ControlLogix communication module providing redundant ControlNet connectivity. It occupies a single backplane slot and integrates dual ControlNet BNC ports to support up to 5 Mb/s transmission with ControlNet redundancy. It supports up to 99 network nodes, 128 Logix connections, and up to 131 total connections. It is used where redundant, deterministic network communication is required within a ControlLogix system-common in large-scale discrete manufacturing or process control environments requiring high availability.

Best Suited For

  • ControlLogix systems requiring redundant ControlNet communication
  • High-availability network architectures
  • Application requiring support for up to 99 ControlNet nodes
  • Systems needing 128 Logix communication connections
Communication Ports
2 ControlNet BNC, 1 USB
Network Redundancy
Yes (redundant topology)
ControlNet rate
5 Mbps
Max Logix connections
128
Power dissipation
6.7 W

Technical Specifications

I/O & Electrical

Input current
1300 mA @ 5.1 V DC; 3 mA @ 24 V DC
Power dissipation
6.7 W
Thermal dissipation
22.9 BTU/h
Slot width
1

Communication & Power

Transmission rate
5000 kbps
Number of channels
2
Connections supported, max
131

Physical & Environmental

Operating temperature
0 to 60 °C
Storage temperature
-40 to 85 °C
Weight, approx
0.293 kg

Certifications

CEUL ListedCSA ListedFM ApprovedATEXIECExUKCAChina CCC

Meets ControlNet standard; certified for CISPR 11 Class A emissions; complies with industry-standard vibration, shock, ESD, EFT/B, RF and surge immunity per ControlLogix module requirements.

1-Year Warranty

Every tested unit is backed by our free 1-year PLC Department warranty, direct from us.

Fast Shipping

Free ground shipping. Orders by 1 PM CST ship same-day, with overnight available.

USA Stock

Sourced and shipped from Texas, USA. Never anonymous overseas marketplace stock.

30-Day Returns

Hassle-free RMA. If the part is not right for your application, send it back within 30 days.

Reseller Options

Resellers welcome. Reach out for volume pricing and we will get you set up.

Talk to a Real Person

Fast answers on stock, revisions, and shipping. (833) 800-7748 or live chat.

PLC Department customer reviews from maintenance and engineering teams

Trusted by 1000s of teams who keep plants running

From maintenance managers and controls engineers to Fortune 500 manufacturers, teams across America count on PLC Department. Years of customer care, every unit bench-tested before it ships, and real people on the phone when a line is down. Our job is simple: get you back up and running, fast.

Read customer reviews

We're here to support your business
Call, email, or chat anytime

Rockwell Automation documentation

Access official manuals, datasheets, and lifecycle information for this part directly from Rockwell Automation.

Visit RockwellAutomation.com

Must Read: Disclaimer

PLC Department sells surplus and refurbished industrial automation products, including but not limited to programmable logic controllers (PLCs), which are sourced exclusively through independent third-party channels. PLC Department is not an authorized distributor, reseller, or representative of any manufacturer listed on this website, including Rockwell Automation or its Allen-Bradley brand. All product warranties, where offered, are provided solely by PLC Department and not by the original manufacturer.

Any reference to manufacturer names, logos, trademarks, or product identifiers is for identification and compatibility purposes only. All such trademarks and brand names are the property of their respective owners, and this website is not affiliated with, endorsed by, or approved by any manufacturer referenced herein.

The products offered for sale may be used or surplus and may contain older date codes, be of earlier series or versions, or differ in appearance or features compared to products available through factory-authorized distribution channels. The presence, version, or functionality of firmware, if any, on programmable devices such as Allen-Bradley PLCs is not guaranteed. PLC Department makes no representation or warranty regarding:

PLC Department does not obtain or supply firmware on behalf of customers. It is solely the customer's responsibility to ensure legal and compliant use of any firmware or software associated with products purchased through this site, including compliance with any applicable license agreements or manufacturer policies.

Products listed on this site may vary in country of origin, packaging, language, accessories, and included materials. Any quality control, testing, certification, or warranty previously associated with the manufacturer does not apply unless explicitly stated by PLC Department.

By purchasing through this website, you acknowledge and agree to these terms.