Genuine Allen-Bradley 1756-CNBR ControlLogix Communication Module | ControlLogix Series – Verified Source
The Allen-Bradley 1756-CNBR is a ControlNet Bridge Module within Rockwell Automation’s ControlLogix platform — one of the most widely deployed industrial automation architectures in process control, automotive, oil & gas, and discrete manufacturing. As a critical communication backbone component, the 1756-CNBR enables deterministic, high-speed ControlNet connectivity between ControlLogix chassis. Due to its industrial importance and relatively limited production volume, this module is frequently targeted by counterfeit and substandard substitute products in the secondary market, posing serious risks to system stability, safety compliance, and production continuity.
At Konmask, every Allen-Bradley 1756-CNBR we supply is sourced through verified industrial channels and subjected to our documented multi-step authentication process before shipment. We deal exclusively in genuine, authentic Allen-Bradley hardware — never clones, refurbished-as-new, or unverified grey-market units. Our verified sourcing chain, combined with full documentation support (Certificate of Conformance, test reports, packing lists, and COO declarations), gives procurement engineers and plant managers the confidence to specify Konmask as a trusted supplier for critical automation components.
Technical Specifications
| Part Number | 1756-CNBR |
| Brand / Manufacturer | Allen-Bradley / Rockwell Automation |
| Series | ControlLogix 1756 |
| Module Type | ControlNet Bridge Module |
| Network Protocol | ControlNet (IEC 61158 / EN 50170) |
| Backplane Interface | ControlLogix 1756 backplane |
| ControlNet Ports | 2 × BNC (redundant media capable) |
| Max Network Nodes | 99 nodes per network |
| Data Rate | 5 Mbps |
| Max Cable Distance | 1,000 m (coax); 3,000 m (fiber with repeater) |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5% to 95% non-condensing |
| Power Consumption | 800 mA @ 5 VDC (backplane) |
| Dimensions (H × W × D) | 94.0 mm × 94.0 mm × 87.6 mm (approx.) |
| Weight | Approx. 250 g |
| Certifications | UL, CE, C-Tick, FM Class I Div 2 |
| Firmware | Configurable via RSNetWorx for ControlNet |
| Enclosure Rating | Open-style (panel/rack mount) |
Specifications verified against Allen-Bradley / Rockwell Automation official documentation (Publication 1756-TD001).
Our 4-Step Quality Verification Process
Every 1756-CNBR unit shipped by Konmask passes through the following documented verification stages:
- Step 1 — Visual & Markings Inspection: Physical examination of housing, label printing quality, holographic seals, part number engraving, and date code consistency against known-genuine reference units. Counterfeit modules frequently exhibit label misalignment, incorrect font weight, or missing secondary markings.
- Step 2 — Functional Power-On Test: Module is seated in a live ControlLogix chassis and powered on. We verify backplane communication, LED status sequence (OK, NET A, NET B indicators), and successful recognition by RSLogix 5000 / Studio 5000 software.
- Step 3 — ControlNet Network Commissioning Test: Module is configured via RSNetWorx for ControlNet and verified to establish scheduled and unscheduled connections at rated 5 Mbps. Network node address assignment and keeper functionality are confirmed.
- Step 4 — Documentation Package Compilation: Upon passing all functional tests, we compile the shipment documentation: Certificate of Conformance (COC), functional test report with pass/fail criteria, high-resolution photos of the actual unit, packing list, and Certificate of Origin (COO) declaration. All documents are available upon request prior to or at time of shipment.
Key Features & Benefits
- Deterministic ControlNet Communication: Supports scheduled (implicit) messaging for time-critical I/O data transfer, compliant with IEC 61158 Type 2 ControlNet specification — essential for motion and process control applications requiring cycle-accurate data delivery.
- Redundant Media Support: Dual BNC ports enable redundant coaxial cable topology, meeting IEC 62439 network redundancy principles for high-availability plant networks where single-point-of-failure is unacceptable.
- Seamless ControlLogix Integration: Native backplane integration with all 1756-series controllers (L6x, L7x, L8x families) eliminates gateway latency and simplifies system architecture.
- High Node Density: Supports up to 99 ControlNet nodes per network segment, enabling large-scale distributed I/O architectures without additional infrastructure.
- Wide Environmental Tolerance: Rated for 0–60°C operation with 5–95% RH tolerance, suitable for demanding industrial environments including foundries, chemical plants, and outdoor enclosures.
- Long-Term Platform Support: Part of Rockwell Automation’s ControlLogix ecosystem with established spare parts availability, firmware update paths, and global technical support infrastructure.
Typical Applications
- Oil & Gas: Pipeline SCADA systems requiring deterministic communication between remote I/O racks and central ControlLogix controllers across extended cable runs.
- Automotive Manufacturing: Body-in-white welding lines and paint shop conveyors where synchronized motion control demands sub-millisecond I/O update rates via scheduled ControlNet messaging.
- Water & Wastewater Treatment: Multi-pump station control networks linking distributed 1756 chassis across treatment plant facilities with redundant media for continuous operation.
- Power Generation & Utilities: Turbine control and substation automation systems requiring certified FM Class I Div 2 rated communication hardware in hazardous area installations.
- Chemical & Pharmaceutical Processing: Batch control systems (ISA-88 compliant) where ControlNet bridges interconnect recipe management controllers with field I/O modules.
- Mining & Minerals Processing: Conveyor and crusher control networks in high-vibration, high-dust environments where robust coaxial ControlNet media outperforms Ethernet in EMI-intensive conditions.
Compatible System Components
- 1756-L6x / L7x / L8x ControlLogix Controllers (all current firmware revisions)
- 1756-PA72 / PB72 / PA75 / PB75 ControlLogix Power Supplies
- 1756-A4 / A7 / A10 / A13 / A17 ControlLogix Chassis
- 1794-ACN15 / ACNR15 FLEX I/O ControlNet Adapters
- 1756-CN2 / CN2R ControlNet Bridge Modules (peer bridging)
- 1786-RPA / RPCD ControlNet Repeaters (for extended cable runs)
- 1786-BNC / BNCJ ControlNet Tap Connectors
- RSNetWorx for ControlNet (network configuration software)
- Studio 5000 Logix Designer (controller programming environment)
Global Sourcing & Shipping Capabilities
Konmask supplies the 1756-CNBR to industrial customers across Asia-Pacific, Europe, the Middle East, North America, and Southeast Asia. Our primary served markets include China, Singapore, Malaysia, Thailand, Vietnam, UAE, Saudi Arabia, Germany, the UK, and the United States.
- Packaging Standard: Original manufacturer packaging where available; otherwise ESD-safe anti-static bag + foam-lined carton with moisture barrier. All units are individually bubble-wrapped and secured against transit shock per ISTA 2A guidelines.
- Export Documentation: Commercial invoice, packing list, COO declaration, and COC provided as standard. HS Code 8537.10 applicable for customs classification.
- Lead Time: In-stock units ship within 1–3 business days. Sourced units: 5–15 business days depending on origin. Express DHL / FedEx / UPS available for urgent requirements.
- Minimum Order: Single unit orders accepted. Volume pricing available for 5+ units — contact us for a formal quotation.
Certifications & Compliance Statement
- ✅ UL Listed (UL 508 Industrial Control Equipment)
- ✅ CE Marked (EMC Directive 2014/30/EU; Low Voltage Directive 2014/35/EU)
- ✅ C-Tick / RCM (Australian Communications and Media Authority)
- ✅ FM Approved — Class I, Division 2, Groups A, B, C, D (Hazardous Locations)
- ✅ ControlNet International Conformance Tested
Konmask Quality Commitment: We supply only genuine Allen-Bradley hardware sourced through verified industrial channels. All units are tested prior to shipment and backed by our authenticity guarantee. If any unit is found to be non-genuine upon receipt, we will provide a full replacement or refund — no questions asked. Our quality commitment is documented and enforceable.
How to Order
- Submit Your Inquiry: Contact us via the product page, email [email protected], or WhatsApp/phone at +0086 19859288691 with your required quantity, delivery timeline, and destination country.
- Receive Quotation & Documentation Preview: We respond within 24 hours with a formal quotation, stock confirmation, and — upon request — pre-shipment photos, test report summary, and COC draft for your review and approval.
- Confirm & Ship: Upon order confirmation and payment, we prepare the unit(s), compile the full documentation package, and dispatch with tracking. You receive shipment notification and all documents electronically within 24 hours of dispatch.
Sample / Evaluation Policy: For qualified buyers placing first orders, we can arrange a single-unit evaluation shipment with full test report and COC. Contact us to discuss terms.
Authenticity & Trust FAQ
- Q: How can I verify that the 1756-CNBR I receive from Konmask is genuine Allen-Bradley?
- A: Every unit we ship includes a Certificate of Conformance (COC) and functional test report. Upon receipt, you can verify authenticity by: (1) checking the Rockwell Automation holographic label and date code against AB’s published format; (2) installing the module in a live chassis and confirming recognition in Studio 5000 / RSLogix 5000; (3) contacting Rockwell Automation’s product verification line with the module serial number. We encourage and support all verification steps.
- Q: What is Konmask’s warranty policy for the 1756-CNBR?
- A: We provide a 12-month warranty against manufacturing defects and functional failure under normal operating conditions. If a unit fails within the warranty period, we will replace it or issue a full refund. Our authenticity guarantee is separate and unconditional: if a unit is proven non-genuine, we replace or refund immediately regardless of time elapsed since purchase.
- Q: Can Konmask provide a test report and Certificate of Conformance before I place an order?
- A: Yes. For qualified buyers, we can provide a sample COC template and a summary of our standard test protocol prior to order placement. For confirmed orders, the full test report (with actual pass/fail data for your specific unit) and COC are provided as standard shipment documents. We can also provide pre-shipment photos of the actual unit and its packaging upon request.
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Contact: [email protected] | +0086 19859288691
