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Description
Application Scenarios:
Picture a refinery crude unit where a single ControlLogix 5580 processor must supervise more than 2,000 I/O points, drive eight servo axes on the loader, host the EtherNet/IP bridge to the plant SCADA layer, and run a safety controller for the burner‑management system — all inside one panel. A 10‑slot chassis cannot absorb that module count, and splitting the system across multiple racks would fragment the backplane communication path and add latency the process cannot tolerate. The 1756‑A17 was engineered for exactly this pain point: its seventeen slots let the processor, the safety module, the motion module, the EtherNet/IP bridges, and fourteen I/O cards coexist on one high‑speed backplane, with 15A of aggregate 5.1V DC capacity and 4A per slot at 3.3V DC — enough headroom for the heaviest module mix ControlLogix offers.nexinstrument.com The same capacity advantage applies in offshore production platforms where panel real estate is expensive, in automotive body shops coordinating dozens of motion axes, in water treatment plants consolidating multiple unit processes into one chassis, and in any retrofit where the existing 17‑slot footprint must be preserved without redesigning the panel.rockwellautomation.com
Parameter:
| Main Parameters | Value / Description |
|---|---|
| Product Model | 1756‑A17 |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Product Category | 17‑Slot ControlLogix Modular Chassis |
| Number of Slots | 17 module slots, numbered 0–16, fixed physical addressing |
| Backplane Current, Chassis Total @ 1.2V DC | 1.5A (chassis‑level rail) |
| Backplane Current, Chassis / Slot @ 3.3V DC | 4A chassis / 4A per slot |
| Backplane Current, Chassis / Slot @ 5.1V DC | 15A chassis / 6A per slot |
| Backplane Current, Chassis / Slot @ 24V DC | 2.8A chassis / 2.8A per slot |
| Power Dissipation (max) | 6 W |
| Chassis Dimensions (H × W × L) | 20.32 × 23.18 × 72.39 cm (8 × 9.1 × 28.5 in) |
| Minimum Enclosure Size (H × W × D) | 76.2 × 91.4 × 20.3 cm (30 × 36 × 8 in) |
| Weight (approx.) | 2.57 kg (5.7 lb) |
| Mounting | Horizontal back‑panel / sub‑panel mount only |
| Operating / Storage Temperature | 0 to +60°C / –40 to +85°C |
| Processor Compatibility | ControlLogix 5580 (1756‑L8x) and 5570 (1756‑L7x) families |
| Power Supply Compatibility | 1756‑PA50, 1756‑PA72, 1756‑PA75, 1756‑PB75, 1756‑PC75, 1756‑PSCA2 |
| Certifications | CE, UKCA, ATEX, IECEx Scheme, Australian RCM, China CCC, American Bureau of Shipping (ABS) |
Technical Principles and Innovative Values:
- Innovation Point 1 – Four Independent Backplane Power Rails. The 1756‑A17 distributes 1.2V, 3.3V, 5.1V, and 24V DC across dedicated rails, each with its own chassis and per‑slot current limit. This multi‑rail architecture lets Rockwell optimize each module family independently — modern 5580 processors draw heavily from the 3.3V logic rail, legacy analog cards from the 5.1V rail, and 24V DC sensor excitation from the auxiliary rail — without cross‑rail noise coupling that a single‑rail generic backplane would impose.nexinstrument.com
- Innovation Point 2 – Deterministic Backplane Communication Bus. Every module in the 1756‑A17 shares the same high‑speed backplane as both a power source and a peer‑to‑peer communication path. This means a motion module in slot 14 can exchange axis‑level commands with a processor in slot 0 without traversing an Ethernet switch or a fieldbus master — the backplane is the fabric, and updates ride at hardware timing, not network scheduling.rockwellautomation.com
- Innovation Point 3 – Fixed‑Slot Physical Addressing Across 17 Slots. Unlike chassis that require software slot mapping or DIP‑switch configuration, the 1756‑A17 assigns each module its I/O address by physical position (slots 0–16). This eliminates configuration drift between identical panels, simplifies documentation, and lets a maintenance technician visually correlate a field fault to the exact card in the exact slot.rockwellautomation.com
- Innovation Point 4 – Industry‑Leading 17‑Slot Density. At 17 slots, the 1756‑A17 carries the highest module density in the 1756 ControlLogix chassis family — 70% more capacity than the 10‑slot 1756‑A10 in only 25% more panel width. For large process trains and multi‑axis motion systems, this density routinely collapses what would otherwise be a two‑rack installation into a single chassis, cutting interconnect cables, cabinet wiring, and the diagnostic complexity of a multi‑rack I/O tree.rockwellautomation.com+1
- Innovation Point 5 – Native ControlLogix Ecosystem Integration. Because the 1756‑A17 backplane hosts the entire modern ControlLogix portfolio — 5580 processors, EtherNet/IP bridges, integrated safety modules, motion control cards, redundancy modules — a single chassis can support integrated motion, integrated safety, and standard control simultaneously, something no competitor chassis delivers without partitioning across separate controllers.tcisupply.com
- Innovation Point 6 – Global Certification Portfolio for Hazardous and Marine Duty. The 1756‑A17 carries ATEX, IECEx Scheme, Australian RCM, China CCC, CE, UKCA, and American Bureau of Shipping certifications — meaning the same chassis is certifiable for European offshore platforms, Middle East onshore facilities, Australian mining operations, and marine‑class vessels without regional substitution.
