Allen-Bradley 1756-A17 ControlLogix 17-Slot Chassis | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1756-A17 is a 17-slot chassis designed for the ControlLogix platform by Rockwell Automation. It provides the physical backplane infrastructure for mounting ControlLogix I/O, communication, and controller modules in demanding industrial automation environments. This page serves as a comprehensive selection, replacement, and compatibility reference for engineers and procurement teams.
Technical Specifications
| Part Number | 1756-A17 |
| Brand | Allen-Bradley / Rockwell Automation |
| Series | ControlLogix 1756 |
| Number of Slots | 17 |
| Backplane Current (5 VDC) | 10 A |
| Backplane Current (24 VDC) | 2 A |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to 85 °C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Weight | Approx. 4.9 kg |
| Mounting | DIN rail or panel mount |
| Power Supply Compatibility | 1756-Pxx series (sold separately) |
| Certifications | UL, CE, CSA |
Compatible Replacement & Equivalent Models
When the 1756-A17 is unavailable or cost-prohibitive, the following models may serve as direct or functional replacements depending on slot count requirements and system design:
| Model | Slots | Notes |
| 1756-A4 | 4 | Smaller footprint; use when fewer modules required |
| 1756-A7 | 7 | Mid-size alternative for compact panels |
| 1756-A10 | 10 | Common replacement when 17 slots not needed |
| 1756-A13 | 13 | Near-equivalent; 4 fewer slots |
| 1756-A17 (Series B) | 17 | Direct drop-in replacement; verify series compatibility |
| 1756-A17XT | 17 | Extended-temperature variant for harsh environments |
Note: All replacements must use compatible 1756-series power supplies and modules. Consult Rockwell Automation documentation before substitution.
Why Choose the Original 1756-A17
- Maximum slot density — 17 slots accommodate large, complex control architectures in a single chassis
- Full ControlLogix ecosystem support — native compatibility with all 1756-series controllers, I/O, and communication modules
- Proven reliability — field-tested in continuous process, discrete manufacturing, and hybrid applications
- Redundancy-ready — supports ControlLogix redundancy configurations with appropriate controller and chassis pairs
- Scalable architecture — expandable via ControlLogix backplane bridging for multi-chassis systems
Typical Applications
- Automotive assembly line control systems
- Oil & gas pipeline SCADA and DCS integration
- Water/wastewater treatment plant automation
- Power generation and distribution control
- Pharmaceutical batch process control (FDA 21 CFR Part 11 environments)
- Food & beverage packaging and filling lines
- Mining and material handling conveyors
System Compatibility
The 1756-A17 chassis is compatible with the full range of ControlLogix 1756-series modules, including:
- Controllers: 1756-L6x, 1756-L7x, 1756-L8x series (Logix 5560 through 5580)
- Power Supplies: 1756-PA72, 1756-PB72, 1756-PC75, 1756-PH75 and other 1756-Pxx models
- I/O Modules: All standard 1756 digital and analog I/O modules
- Communication Modules: 1756-EN2T (EtherNet/IP), 1756-DNB (DeviceNet), 1756-CN2 (ControlNet), 1756-DHRIO (DH+/RIO)
- Motion Modules: 1756-M02AE, 1756-M03SE and compatible servo drive interfaces
Selection Guide
Use the following criteria to select the correct ControlLogix chassis for your application:
- Module count: Count all required controller, I/O, and communication modules — select a chassis with at least 1–2 spare slots for future expansion
- Power budget: Sum the 5 VDC and 24 VDC backplane current draw of all modules; ensure the selected power supply meets or exceeds total demand
- Environment: Standard 1756-A17 suits 0–60 °C; choose 1756-A17XT for -25 °C to 70 °C extended-temperature environments
- Redundancy: For high-availability systems, pair two 1756-A17 chassis with 1756-L7x redundancy controllers and 1756-SRM synchronization modules
- Panel space: Verify DIN rail or panel dimensions; the 17-slot chassis requires approximately 17.5 inches (445 mm) of horizontal panel width
Quality Assurance & Sourcing
At Konmask.com, every Allen-Bradley 1756-A17 unit is:
- Sourced from authorized distributors or verified surplus channels
- Inspected for physical integrity, backplane connector condition, and label authenticity
- Tested for backplane continuity prior to shipment
- Shipped with anti-static packaging and appropriate cushioning
- Backed by our standard warranty and return policy
We specialize in industrial automation components for B2B buyers requiring reliable, spec-accurate parts with fast global shipping.
How to Order
- Confirm your required part number: 1756-A17 (specify Series A or B if known)
- Add to cart or contact us for bulk/project pricing
- Provide your shipping destination for freight quote (DHL, FedEx, or sea freight available)
- Payment via T/T bank transfer, PayPal, or other agreed terms
- Lead time: typically 3–7 business days for in-stock units; 2–4 weeks for sourced orders
For urgent requirements or large quantities, contact our team directly at support@konmask.com or +0086 19859288691.
Replacement & Compatibility FAQ
Q: Can I use a 1756-A13 as a direct replacement for the 1756-A17?
A: Functionally yes, if your system uses 13 or fewer modules. The backplane and power supply interfaces are identical; only slot count differs.
Q: Is the 1756-A17 compatible with older Logix 5550 controllers?
A: Yes. The 1756-A17 chassis is backward-compatible with 1756-L55 (Logix 5555) and earlier controllers, though firmware and feature limitations may apply.
Q: Can I mix Series A and Series B modules in the same chassis?
A: In most cases yes, but always verify with Rockwell Automation’s compatibility matrix or contact Konmask for application-specific guidance.
Q: What power supply do I need for a fully loaded 1756-A17?
A: A fully loaded 17-slot chassis typically requires a 1756-PA75 or 1756-PB75 (75W) power supply. Calculate your actual module current draw to confirm.
Q: Do you supply new, refurbished, or surplus units?
A: We supply new, factory-surplus, and professionally refurbished units. Condition is clearly stated on each listing. Contact us if you need a specific condition.
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