Product Details
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
| Feature | Specification Details |
| Manufacturer | Allen Bradley / Rockwell Automation |
| Number of Slots | 7 Module Slots |
| Backplane Current (5.1V DC) | 10 Amps Max |
| Backplane Current (24V DC) | 2.88 Amps Max |
| Mounting Type | Panel Mount (4 Tabs) |
| Chassis Interconnect | Supports up to 2 additional chassis |
| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
| Storage Temperature | -40 to 85 °C (-40 to 185 °F) |
| Relative Humidity | 5% to 95% (Non-condensing) |
| Weight | 2.69 lbs (1.22 kg) |
Engineering Advantages
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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.
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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.
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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.
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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
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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.
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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.
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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.
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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.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Preventing Spurious Trips in Emergency Stop Systems: A Technical Guide
In industrial automation, the Emergency Stop (E-Stop) pushbutton is the ultimate safety line. However, relying on a single Normally-Closed (NC) contact can sometimes lead to unexpected spurious trips. As a control systems engineer, I have seen these nuisance trips halt entire production lines, causing significant downtime. Understanding why these components fail and how to implement robust architecture is essential for any reliable DCS or PLC-based safety system.
Sequencing Induction Motor Control with PLC Logic: Best Practices
In modern industrial automation, controlling a group of induction motors requires precision and safety. Uncontrolled simultaneous startup of multiple large motors often causes significant voltage dips, potentially triggering protective trips. Therefore, implementing a sequential startup and shutdown strategy is essential. This approach minimizes inrush current and ensures the system operates within established power constraints. A robust PLC program serves as the ideal engine for orchestrating these sequences.
Mastering PLC Programming: Best Practices for Robust Industrial Automation
Writing clean PLC code requires discipline, especially regarding memory management. Avoid overusing SET and RESET instructions, as they often complicate debugging. If multiple rungs control the same bit, troubleshooting becomes a nightmare. Instead, focus on energizing a bit in only one location. If your logic requires complex conditions, use branches within a single rung. This approach keeps your code readable, maintainable, and significantly easier to audit during downtime.