Allen Bradley 1746-A7 SLC 500 7-Slot I/O Mounting Chassis

Product Overview

The Allen Bradley 1746-A7 provides the essential physical and electrical backplane for SLC 500 modular hardware. This 7-slot mounting chassis houses the processor, power supply, and up to six I/O or specialty modules. It facilitates high-speed communication between components while distributing regulated power across the backplane. We supply this unit as 100% Brand New original equipment, ensuring full structural integrity and electrical conductivity for your decentralized or standalone control systems.

Technical Specifications

Engineering Advantages

• Optimized Power Distribution: The 1746-A7 backplane delivers up to 10 Amps at 5.1V DC. This high current capacity supports power-intensive modules—such as high-speed counters or network scanners—without causing voltage drops that could lead to processor faults.

• Modular Scalability: This chassis supports interconnect cables to link with up to two other SLC 500 chassis. This capability allows engineers to expand I/O counts across multiple racks while maintaining a single, unified control logic managed by the primary processor.

• Vibration-Resistant Installation: The panel mounting option utilizes four robust tabs. To solve the industrial pain point of electrical noise and vibration, Allen Bradley requires the use of Phillips screws with star washers or SEM screws. These fasteners ensure a low-impedance ground connection to the backpanel, effectively draining EMI/RFI and protecting sensitive data signals.

• Space-Efficient Footprint: The 7-slot configuration strikes a balance between I/O density and cabinet space. It fits perfectly into smaller machine-mount enclosures where a larger 10 or 13-slot chassis would be physically incompatible.

FAQs

• How do I properly ground the 1746-A7 chassis?

  The mounting tabs serve as the primary grounding path. You must ensure the mounting surface is free of paint and corrosion. Use star washers with your mounting screws to bite through the chassis finish, creating a direct metal-to-metal bond with the grounded backpanel.

• Can I install any SLC 500 power supply in the 1746-A7?

  Yes. The chassis features a dedicated power supply slot on the left side. It accommodates all standard SLC 500 power supplies (e.g., 1746-P1, P2, P3, or P4). Always verify that the selected power supply meets the total current draw requirements of all installed modules.

• Does this chassis support hot-swapping of modules?

  No. The SLC 500 architecture does not support "Removal and Insertion Under Power" (RIUP). You must disconnect all power to the chassis before installing or removing any I/O or processor modules to prevent permanent hardware damage.

• What is the condition of this unit?

  This 1746-A7 is 100% Brand New, original factory stock. It arrives in the original manufacturer's box with the UPC 662468415361 intact. We do not sell used, refurbished, or "new-surplus" items with questionable history.