Allen Bradley 1756-CN2R
Allen Bradley 1756-CN2R
Allen Bradley 1756-CN2R
Allen Bradley 1756-CN2R
Allen Bradley 1756-CN2R
Allen Bradley 1756-CN2R
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    Apter Power supports CN2R quotations, schedule documentation, redundant-media review, and migration records.

1756-CN2R

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Allen-Bradley 1756-CN2R is a dual-channel redundant ControlNet interface for ControlLogix systems with 128 Logix connections and two BNC ports.
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Technical specifications for 1756-CN2R

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-CN2R
  • Product Family:
    ControlLogix
  • Product Type:
    Redundant ControlNet Communication Module
  • Stock:
    1
  • ControlNet Ports:
    2 BNC
  • Logix Connections:
    128
  • Maximum Nodes:
    99
  • Current Draw:
    1.3 A at 5.1 V DC; 3 mA at 24 V DC
  • ControlNet Rate:
    5 Mbps
  • Connections Supported:
    131 maximum
  • Power Dissipation:
    6.7 W
  • Operating Temperature:
    0 to 60 °C
  • Weight:
    0.293 kg
  • Estimated shipping dimensions:
    17.4 x 3.5 x 14.1 cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Media A/B Net Schedule Migration Review

Features:

•Two ControlNet BNC ports for redundant A/B media
•128 Logix connections and up to 99 network nodes
•One-slot ControlLogix chassis interface operating at 5 Mbps

The Allen-Bradley 1756-CN2R connects a ControlLogix chassis to redundant ControlNet media for scheduled I/O, controller messaging, and maintenance access.

ControlNet is a legacy network, so both immediate replacement needs and a documented migration path should be considered without changing the installed design by assumption.

A valid spare plan includes the RSNetWorx schedule, keeper details, node map, cable and tap records, module series, firmware, chassis slot, and acceptance procedure.

Availability is subject to Apter Power's current inventory and sourcing confirmation.

Allen-Bradley 1756-CN2R Redundant ControlNet Communication Module Manuals, Datasheets, Links

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Allen-Bradley 1756-CN2R Redundant ControlNet Communication Module Specs

General

  • ManufacturerAllen-Bradley
  • Model1756-CN2R
  • ConditionNew Original ready stock
  • Product FamilyControlLogix

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Redundant ControlNet paths

•Channel A: Trace cable, taps, and terminators end to end.
•Channel B: Verify the independent backup media path.
•Node address: Prevent duplicates during replacement.
•Diagnostics: Record channel-specific errors and status.

Preserving deterministic traffic

•RSNetWorx file: Keep the approved offline network record.
•Keeper data: Document the active keeper arrangement.
•Scheduled load: Confirm I/O timing and connection use.
•Acceptance: Verify the schedule after any module change.

Legacy network risk planning

•Installed base: Inventory nodes, taps, media, and spares.
•Support tools: Record software, interface, and license dependencies.
•Risk: Identify single points that threaten recovery.
•Roadmap: Plan changes without assuming a drop-in replacement.
Description
1756-CN2R provides a redundant A/B ControlNet interface for a ControlLogix chassis through two BNC network ports. Rockwell Automation specifies 128 Logix communication connections and support for as many as 99 nodes.

1756-CN2R operates on a scheduled 5 Mbps ControlNet network where deterministic I/O and controller traffic depend on correct node addressing, media design, keeper information, and an approved network schedule.

1756-CN2R should be replaced only after preserving the hardware series, firmware, node address, both cable paths, tap locations, ControlNet schedule, RSNetWorx file, chassis slot, controller project, and current diagnostics.
Revisions

Revision Part #

Also known as

1756-CN2R Ser A
1756-CN2R/A, Series A, Rev A
1756-CN2R Ser B
1756-CN2R/B, Series B, Rev B
1756-CN2R Ser C
1756-CN2R/C, Series C, Rev C
Alternative Names
1756-CN2RK 1756-EN2FK 1756-EN2TK 1756-EN2TPK 1756-EN2TRK 1756-EN4TRK 1756-ENBTK 1756-TIMEK
Technical notes
Allen-Bradley 1756-CN2R is a dual-channel ControlNet interface with two BNC ports and 128 Logix connections. Preserve node, schedule, media, and project records.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What ControlNet records should be saved before replacing Allen-Bradley 1756-CN2R?
Save the RSNetWorx file, network schedule, keeper data, node address, both media paths, taps, firmware, chassis slot, and controller project.
Why can Allen-Bradley 1756-CN2R show one healthy channel and one failed channel?
Inspect the affected BNC path, taps, terminators, connectors, cable damage, noise, node diagnostics, and channel-specific status before changing configuration.
What should an Allen-Bradley 1756-CN2R quotation request include?
Provide label and series photographs, firmware, node role, chassis, controller, network schedule status, quantity, destination, and required date.
How should Allen-Bradley 1756-CN2R node addressing be handled during replacement?
Record the approved node address before removal, avoid duplicates, restore it exactly, and verify the scheduled network under the controlled procedure.
When should a migration review accompany an Allen-Bradley 1756-CN2R spare request?
Review migration when ControlNet media, taps, interface modules, engineering tools, or site spares are becoming difficult to support.
How should engineers validate Allen-Bradley 1756-CN2R after installation?
Confirm module identity, node address, both channels, keeper and schedule status, controller connections, I/O updates, messaging, diagnostics, and restart recovery.