Allen-Bradley 1756-CN2 ControlLogix ControlNet Module
Allen-Bradley 1756-CN2 ControlLogix ControlNet bridge (2nd generation), ControlNet bridge module, standard media, 5 Mbps, second generation with 128 connections. NJT Automation offers mail-in repair for the 1756-CN2 with a 1-year warranty; replacement pricing is available on request.
Mail-in repair available now. Returned with a 1-year warranty. Replacement pricing on request.
Actual NJT inventory photos
| Part Number | 1756-CN2 |
| Price | On Request Previously sold for $599.99 USDAvailability and condition determine final quote. |
| Description | ControlLogix ControlNet bridge (2nd generation). |
| Shipping | UPS Ground included | Next-Day Air and Worldwide Shipping available at checkout |
| Warranty | 1-year full-function warranty provided by NJT Automation. Warranty details
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| Returns | 90-day free returns. View return policy |
| Exchange | Send us your defective 1756-CN2 after your purchase for a 10% core credit. We also purchase old or damaged parts outright. |
| Availability | Sourced on request We do not have a 1756-CN2 on the shelf right now. We can source one through our supplier network; request a quote and we confirm availability, price and lead time before you commit. | ||||||||
| Sourcing | Sourced through our Level 1 network of vetted US suppliers. Each unit is checked before it ships and carries the same NJT warranty and return policy as our own stock. Quotes within one hour during business hours; typical delivery 3–5 business days, next-day air available. Sourced parts are not available for local pickup. | ||||||||
| Repairs | 1756-CN2 Mail-In Repair ServiceEstimated: $1,440.00 | ||||||||
Part Number Decoder | ControlLogix ControlNet bridge (2nd generation) 1756CN2
Decoded from the Rockwell Automation catalog-number structure. Series and firmware revision are printed on the product label, not encoded here. | ||||||||
Series & Revisions | No series in stock today; request a series above. Series notes: Logix keys on catalog number and firmware revision, not series; with the default Compatible Module keying, any series of the same catalog number is accepted in the slot. | ||||||||
Intended Use | Designed for scheduled ControlNet I/O and peer-to-peer control applications. ControlNet bridges carry deterministic, scheduled I/O traffic between ControlLogix racks, FLEX I/O and drives on the installed base of process and discrete systems built around coax ControlNet media. | ||||||||
Physical Data | Weight and DimensionsWeight0.62 lb (0.28 kg)H × W × D5.7 × 1.4 × 5.7 in. (145 × 35 × 145 mm)
Product weight and dimensions are typical manufacturer-published values and may differ by series or option. Shipping box and weight are estimates for freight planning; the packed unit may ship in a different box. | ||||||||
Similar Part Numbers |
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Allen Bradley Information | Technical SpecificationsLifecycle status
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| Category | ControlLogix | ||||||||
| Part Number | 1756-CN2 | ||||||||
| Manufacturer | Allen-Bradley | ||||||||
Previously sold 1756-CN2
1 soldNJT Automation has supplied and shipped one 1756-CN2 ControlLogix ControlNet bridge in 2024; request a quote and we will source another from our supplier network.
- Sold
- 1 in 2024
- Series
- C × 1
Can the 1756-CN2 be repaired?
Yes. NJT Automation repairs the 1756-CN2 by mail-in: diagnostic evaluation, component-level repair and a functional test, backed by a 1-year full-function warranty.
NJT managed repair. No evaluation fee; no repair, no charge. Prepaid UPS label both ways, $650 minimum, rush available. 1-year full-function warranty included, 2- and 3-year options.
Compare quotes from independent repair technicians. Post your repair on RepairMode to receive competitive bids from experienced technicians. Each technician sets their own pricing and warranty.
Find a PLC repair specialiston RepairMode.com ↗Common failures
Failure patterns we regularly see on ControlLogix ControlNet bridge (2nd generation) hardware like the 1756-CN2:
- Channel A / B LEDs flashing red: failed transceiver or media problem on the coax segment
- Node drops off the ControlNet keeper, scheduled connections fault (bad BNC tap, termination or module)
- Redundant media (CNBR / CN2R) running on one channel because the other transceiver has failed
- Node-address rotary switches worn or intermittent, causing a duplicate-node fault
- Module fails to complete power-up self-test after backplane voltage sag
Photos by NJT Automation; test videos from NJT or network repair technicians.
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