842HR-MJA4215FWYD Allen‑Bradley chassis

Description

842HR-MJA4215FWYD Allen‑Bradley chassis

Product Dimensions：

Allen-Bradley, a brand under Rockwell Automation, offers a range of chassis products primarily within the Bulletin 1756 ControlLogix family. These chassis serve as the foundational backbone for modular control systems, providing mounting slots, high-speed backplane communication, and power distribution for integrating controllers, I/O modules, communication modules, and other components. Designed for industrial automation, the chassis enable scalable systems that support distributed control across local or networked environments. Key models include the 1756-A4 (4 slots), 1756-A7 (7 slots), 1756-A10 (10 slots), 1756-A13 (13 slots), and 1756-A17 (17 slots), with options for standard and extreme-temperature (XT) variants like ControlLogix-XT for harsh environments. These chassis are open-style equipment, meaning they require external enclosures for protection, and they integrate seamlessly with Studio 5000 Logix Designer software for configuration and management.

Product Parameters (Specifications)

The following table summarizes key specifications for common 1756 ControlLogix chassis models, based on Series B/C variants. Specifications may vary slightly by model and series; refer to Rockwell Automation documentation for exact details.

These parameters ensure compatibility with ControlLogix controllers and modules, supporting high-speed data transfer via the backplane.

Product Advantages

Allen-Bradley 1756 chassis products offer several key benefits that make them ideal for demanding industrial applications:

• Scalability and Flexibility: Available in slot sizes from 4 to 17, allowing systems to grow from small standalone setups to large distributed architectures. Modules can be hot-swapped in networked chassis via ControlNet or EtherNet/IP.
• High-Performance Communication: The backplane supports gigabit-speed data exchange, enabling real-time control for motion, I/O, and compute-intensive tasks, with up to 45% increased capacity when paired with 5580 controllers.
• Robustness in Harsh Environments: XT variants and conformal coating provide protection against corrosive atmospheres (e.g., ISA G3 Harsh Group A), vibration, and extreme temperatures, extending system life in oil & gas or manufacturing settings.
• Enhanced Security and Diagnostics: Integration with Studio 5000 software includes controller-based change detection, digitally signed firmware, role-based access control, and TÜV-certified security (IEC 62443-4-2). Built-in displays on compatible systems aid troubleshooting.
• Ease of Integration: Seamless compatibility with Allen-Bradley Logix 5000 ecosystem, reducing engineering time and supporting unified programming for controllers, I/O, and networks.

Precautions and Notes (Attention Matters)

To ensure safe and reliable operation, observe the following precautions:

• Installation Safety: Chassis are open equipment; install in a protective enclosure to guard against dust, moisture, and electrical hazards. Use proper grounding and follow ESD (electrostatic discharge) guidelines during module insertion/removal.
• Power and Wiring: Verify power supply compatibility (e.g., 1756-PB series) and use certified cables. Do not exceed backplane current limits to avoid overheating.
• Environmental Limits: Adhere to temperature, vibration, and shock ratings. For XT models, maintain port plugs/covers on unused ports to preserve corrosive atmosphere ratings once packaging is opened.
• Maintenance: Hot-swapping is supported but requires RIUP (Removal and Insertion Under Power) precautions for certified modules. Regularly inspect for conformal coating integrity in harsh environments.
• Compliance: Consult product certifications (e.g., via rok.auto/certifications) for hazardous location use. Avoid unauthorized modifications, as they may void warranties.

Product Applications

Allen-Bradley 1756 chassis are versatile for industrial automation across sectors:

• Manufacturing and Assembly Lines: Hosting digital/analog I/O and motion control modules for precise machine coordination and process automation.
• Process Industries (Oil & Gas, Water/Wastewater): XT variants with conformal coating for corrosive or extreme-temperature environments, supporting remote I/O via EtherNet/IP.
• Material Handling and Logistics: Integrating communication modules for networked conveyor systems and warehouse automation.
• Power Generation and Distribution: Specialty I/O for monitoring and control in substations or renewable energy setups.
• Pharmaceuticals and Food & Beverage: High-reliability setups with diagnostic modules for compliance-heavy processes requiring traceability and safety.

For the most current details, visit Rockwell Automation’s official resources at rok.auto/literature or consult a local distributor.

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