Product Details
Product Overview
The Allen-Bradley 1756-A7K provides the structural and electrical backbone for mid-sized ControlLogix automation systems. This 7-slot chassis facilitates high-speed data communication via its passive backplane, linking processors, I/O modules, and communication bridges. We supply this unit as 100% Brand New and Original, featuring the "K" suffix for factory-applied conformal coating. This chemical-resistant layer protects internal circuitry from corrosive gases, moisture, and airborne contaminants, making it the industry standard for chemical processing, oil and gas, and wastewater treatment applications.
Technical Specifications
| Parameter | Specification Details |
| Number of Slots | 7 Slots |
| Backplane Current (Max @ 5.1V DC) | 15 A (Chassis) / 6 A (Slot) |
| Backplane Current (Max @ 3.3V DC) | 4 A (Chassis) / 4 A (Slot) |
| Backplane Current (Max @ 24V DC) | 2.8 A (Chassis) / 2.8 A (Slot) |
| Power Dissipation (Max) | 4.5 Watts |
| Operating Temperature Code | T5 (North American and IEC) |
| Mounting Orientation | Horizontal Only |
| Protective Earth Ground Wire | 2.1 mm² (14 AWG) Copper Wire |
| Weight | 1.10 kg (2.4 lbs) |
Engineering Advantages
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Superior Environmental Hardening: The 1756-A7K utilizes a specialized conformal coating to shield sensitive copper traces. This prevents dendritic growth and corrosion in environments categorized by ISA G3 (Harsh) standards, extending the hardware lifecycle significantly compared to standard non-coated versions.
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High-Capacity Power Distribution: The backplane delivers 15 Amps at 5.1V DC. This robust power overhead supports high-density I/O configurations and multiple high-performance processors within a single rack without the risk of voltage sags or thermal instability.
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Streamlined Earthing Protocol: The chassis design includes dedicated points for Functional Earth and Protective Earth. Utilizing 8 AWG and 14 AWG copper wire respectively ensures effective dissipation of electromagnetic interference (EMI), maintaining signal integrity for high-speed motion and analog data.
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Passive Backplane Reliability: By eliminating active electronic components on the backplane itself, the 1756-A7K reduces potential failure points. This design ensures that the chassis remains a transparent, high-speed highway for data exchange across all 7 slots.
FAQs
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What is the difference between the 1756-A7 and the 1756-A7K?
The 1756-A7K includes a factory-applied conformal coating ("K" suffix). While they share the same physical dimensions and slot count, the 1756-A7K provides essential protection against corrosive environments and humidity that would otherwise cause standard boards to fail.
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Can I mount the 1756-A7K vertically to save cabinet space?
No. Technical guidelines mandate horizontal mounting only. Horizontal orientation ensures proper heat convection from the installed power supply and modules, preventing hotspots that could trigger thermal shutdowns of your processors.
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Does the chassis include a power supply?
The chassis functions as a housing and backplane only. You must purchase a compatible 1756 power supply (such as the 1756-PA72K or PB72K) separately. We recommend using conformal-coated "K" version power supplies to match the environmental protection of the 1756-A7K.
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Is this a refurbished or used surplus unit?
We guarantee this product is 100% Brand New and Original. It arrives in the original manufacturer's packaging with the factory seal intact, ensuring you receive the full operational lifespan and performance expected from Allen-Bradley hardware.
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
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.
PLC vs. HMI: Distinguishing the Brain from the Interface in Industrial Automation
In the realm of industrial automation, distinguishing between a Programmable Logic Controller (PLC) and a Human-Machine Interface (HMI) is fundamental. While both devices work in tandem, they serve distinct purposes. The PLC acts as the "brain" of the operation, executing logic, whereas the HMI serves as the "eyes," allowing operators to monitor and interact with the system. Understanding this synergy is essential for any professional designing robust factory automation solutions.
Selecting the Right Industrial Automation Solution for Modern Manufacturing
Choosing an effective industrial automation system starts with a thorough process audit. You must identify tasks that are repetitive, labor-intensive, or prone to human error. Not every process requires high-level automation; therefore, prioritize operations that directly impact throughput and quality. By scoping your needs accurately, you avoid over-investing in unnecessary technology. A balanced approach ensures that your capital expenditure aligns with measurable gains in operational efficiency.