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Description
Application Scenarios
A system integrator is building a control panel for a large water treatment facility with distributed I/O requirements. The application needs a ControlLogix 5580 controller, two EtherNet/IP communication modules, and a mix of analog and digital I/O cards—approximately ten modules total. Rather than splitting the system across multiple smaller chassis, the integrator selects the Allen-Bradley 1756-A13, which provides enough slots to accommodate the entire local rack in a single enclosure. During installation, the chassis is mounted horizontally to the sub-panel, and modules slide into any available slot without slot restrictions . When the facility later adds a third communication module and additional I/O for an expansion phase, the 1756-A13’s remaining slots absorb the growth without requiring a second chassis or re-engineering the panel layout.
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | 1756-A13 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Category | ControlLogix Chassis (13-Slot) |
| Number of Slots | 13 |
| Form Factor | Slot Type Chassis |
| Mounting | Sub-panel, horizontal only |
| Backplane Current (5.1V DC) | 15 A max (chassis) / 6 A max per slot |
| Backplane Current (3.3V DC) | 4 A max (chassis) / 4 A max per slot |
| Backplane Current (24V DC) | 2.8 A max (chassis) / 2.8 A max per slot |
| Operating Temperature | 0…60°C (32…140°F) |
| Enclosure Rating | None (open style) |
| Minimum Enclosure Size | 60.9 × 76.2 × 20.3 cm (24 × 30 × 8 in) |
| Certifications | CE, ATEX, IECEx, CCC, RCM, ABS |
| Lifecycle Status | Active |
Technical Principles and Innovative Values
- Innovation Point 1: Slot-Agnostic Modular Architecture. The 1756-A13 imposes no slot restrictions on module placement. A controller, communication card, or I/O module can be installed in any of the 13 slots, giving system designers complete flexibility in layout. This simplifies spares planning and allows modules to be reorganized without chassis changes, a contrast to fixed-slot architectures where specific module types must occupy designated positions .
- Innovation Point 2: Integrated High-Speed Backplane Communication. The chassis backplane provides a dedicated high-speed communication path between installed modules, separate from external networks. This allows the controller to exchange data with local I/O and communication modules at backplane speeds, reducing latency compared with networked remote I/O configurations. The backplane also distributes power to all modules, eliminating individual power wiring to each card .
- Innovation Point 3: Scalable Chassis Family for Right-Sized Deployments. The 1756-A13 sits in the middle of the standard ControlLogix chassis family, which includes 4, 7, 10, 13, and 17-slot variants. This range allows engineers to match chassis size to application requirements—using the 13-slot version when a compact but expandable local rack is needed, without oversizing to the 17-slot chassis or undersizing to the 10-slot .
