Allen-Bradley 1756-CN2RXT ControlNet Redundant Bridge Module – ControlLogix Series B
Imagine a high-speed automotive assembly line or a continuous chemical processing plant where the ControlNet communication backbone suddenly loses its single path — production halts, alarms cascade, and every minute of downtime translates directly into financial loss and safety risk. The Allen-Bradley 1756-CN2RXT eliminates that single point of failure. Designed as a redundant ControlNet bridge module for the ControlLogix platform, it maintains uninterrupted communication even when one network path is compromised, making it the backbone of mission-critical industrial control architectures.
Within the 1756 ControlLogix family, the 1756-CN2RXT occupies a specialized and indispensable position: it is Rockwell Automation’s purpose-built solution for ControlNet redundancy in extreme-temperature environments (XT = Extended Temperature). While standard ControlNet bridge modules serve conventional plant floors, the CN2RXT is engineered for harsh industrial conditions where ambient temperatures, vibration, and electromagnetic interference push standard hardware beyond its limits. Globally, ControlLogix remains the dominant platform in process, hybrid, and discrete manufacturing — and the 1756-CN2RXT is the module of choice wherever network reliability cannot be compromised.
Technical Specifications
- Part Number: 1756-CN2RXT
- Series: B
- Platform: Allen-Bradley ControlLogix (1756 chassis)
- Network: ControlNet (redundant dual-channel)
- Module Type: ControlNet Redundant Bridge Module
- Temperature Rating: Extended Temperature (XT) — suitable for harsh environments
- Backplane Communication: ControlLogix 1756 backplane
- ControlNet Ports: Dual BNC connectors (Channel A & Channel B)
- Firmware: Compatible with RSLogix 5000 / Studio 5000 Logix Designer
- Certifications: CE, UL (refer to Rockwell Automation product documentation for full certification list)
- Weight: Approx. 200 g
Note: All specifications are sourced from Rockwell Automation official documentation. Konmask.com does not fabricate or alter manufacturer specifications.
Key Features & Benefits
- Dual-Path Redundancy: Simultaneous operation on Channel A and Channel B ensures zero communication loss if one path fails — critical for SIL-rated and high-availability systems.
- Extended Temperature Design: The XT designation means this module is rated for environments where standard modules would fail, including foundries, outdoor enclosures, and high-heat process areas.
- Series B Enhancements: Series B revisions incorporate firmware and hardware improvements over Series A, offering improved diagnostics, stability, and compatibility with current Studio 5000 software versions.
- Seamless ControlLogix Integration: Slots directly into any 1756 chassis, consuming one slot, and is fully managed via RSLogix 5000 / Studio 5000 — no additional configuration hardware required.
- Deterministic Network Performance: ControlNet’s scheduled communication model guarantees deterministic data delivery, essential for motion control and process interlocks.
- Hot-Swap Capable: Supports chassis hot-swap in redundant controller configurations, minimizing maintenance downtime.
Industry & Equipment Applications
- Oil & Gas: Pipeline SCADA systems, wellhead control panels, and offshore platform automation where network redundancy is a safety requirement.
- Chemical & Petrochemical: Continuous process control loops where communication loss triggers emergency shutdowns and costly restarts.
- Automotive Manufacturing: High-speed assembly lines with coordinated motion and I/O across multiple ControlNet nodes.
- Water & Wastewater: Remote pump stations and treatment facilities requiring reliable communication over extended ControlNet segments.
- Power Generation: Turbine control and substation automation where extended temperature and redundancy are non-negotiable.
- Mining & Metals: Harsh-environment conveyor and processing systems with high ambient temperatures and vibration.
System Integration & Compatible Parts
The 1756-CN2RXT is designed to operate within the broader Allen-Bradley ControlLogix ecosystem. Compatible and commonly paired components include:
- Controllers: 1756-L71, 1756-L72, 1756-L73, 1756-L74, 1756-L75 (ControlLogix controllers)
- Redundancy Modules: 1756-RM, 1756-RM2 (for full controller redundancy configurations)
- Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17 (ControlLogix chassis)
- Power Supplies: 1756-PA72, 1756-PB72, 1756-PH75 (ControlLogix power supplies)
- ControlNet Adapters: 1756-CNB, 1756-CNBR (standard ControlNet bridge modules for non-redundant nodes)
- ControlNet Media: RG-6 coaxial cable, BNC connectors, ControlNet taps and repeaters
- Programming Software: Studio 5000 Logix Designer v21 and above
Our Quality Assurance Process
At Konmask.com, every Allen-Bradley 1756-CN2RXT module we supply undergoes a rigorous multi-stage quality verification process before shipment:
- Source Verification: We source modules from authorized distributors, certified surplus channels, and verified OEM partners — never from unvetted grey-market sources.
- Visual & Physical Inspection: Each unit is inspected for physical damage, counterfeit indicators, label authenticity, and correct series/revision markings.
- Functional Testing: Where applicable, modules are bench-tested for power-on self-test (POST) pass and basic communication verification.
- Packaging & ESD Protection: All modules are packed in anti-static bags with appropriate cushioning to prevent transit damage.
- Documentation: We provide available documentation including datasheet references, revision history, and test records upon request.
How to Order
- Submit an Inquiry: Use the contact form or email support@konmask.com with your required quantity, delivery timeline, and destination country.
- Receive a Quote: Our team will respond within 1 business day with pricing, lead time, and shipping options tailored to your project.
- Confirm & Pay: We support T/T (bank transfer), PayPal, and other B2B payment methods. A proforma invoice will be issued upon order confirmation.
- Shipment & Tracking: We ship via DHL, FedEx, UPS, or freight forwarder depending on order size. Full tracking information is provided.
- After-Sales Support: Our technical team is available to assist with installation questions, compatibility verification, and warranty claims.
Why Choose Konmask.com?
- Industrial Automation Specialists: We focus exclusively on PLC, DCS, and industrial automation components — not a generalist electronics distributor.
- Global B2B Export Experience: We have supplied automation components to clients in Southeast Asia, the Middle East, Europe, and the Americas.
- Technical Pre-Sales Support: Our engineers can assist with compatibility checks, system architecture questions, and cross-reference verification before you commit to a purchase.
- Competitive Pricing on Hard-to-Find Parts: We specialize in sourcing discontinued, long-lead, and hard-to-find Rockwell Automation modules at competitive prices.
- Fast Response: Inquiries are answered within 1 business day. Urgent requirements are prioritized.
Frequently Asked Questions
Q: What is the difference between 1756-CN2RXT and 1756-CN2R?
A: The 1756-CN2RXT is the Extended Temperature (XT) variant of the 1756-CN2R. It is rated for operation in higher ambient temperature environments where the standard CN2R would exceed its thermal limits. Both provide dual-channel ControlNet redundancy for the ControlLogix platform.
Q: Is the 1756-CN2RXT Series B backward compatible with Series A systems?
A: Generally yes — Series B modules are designed to be backward compatible with Series A ControlLogix systems. However, we recommend verifying firmware compatibility with your specific controller revision and Studio 5000 version before installation.
Q: Can the 1756-CN2RXT be used in a non-redundant ControlNet configuration?
A: Yes. While the module is designed for redundant dual-channel operation, it can be configured to operate on a single ControlNet channel if required. However, using it in a non-redundant application does not leverage its primary design advantage.
Q: What is the lead time for the 1756-CN2RXT?
A: Lead time varies based on current stock levels. Please contact us at support@konmask.com for real-time availability and delivery estimates for your specific quantity requirement.
Q: Do you provide a warranty on the 1756-CN2RXT?
A: Yes. We provide a warranty on all modules we supply. Warranty terms are specified in the quotation and sales agreement. Please contact us for details.
Q: Can you supply other 1756 ControlLogix modules?
A: Absolutely. Konmask.com maintains an extensive catalog of 1756-series ControlLogix modules including controllers, I/O modules, communication modules, and power supplies. Contact us with your full BOM for a comprehensive quote.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
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