Allen-Bradley 1756-A13/K ControlLogix Chassis

Configured for modular ControlLogix backplane expansion in 13-slot architectures, the Allen-Bradley 1756-A13/K (1756-A13/K ControlLogix chassis) provides direct physical/electrical execution of module interconnection and distributed power arbitration across ControlLogix I/O, CPU, and communication modules. The chassis implements a shared backplane structure enabling deterministic data exchange and synchronized power distribution across horizontally mounted modules in a single rack assembly.

Within the ControlLogix system, the chassis supports multi-rail DC distribution and backplane signaling coordination, ensuring aligned execution of cyclic controller tasks and I/O data transfer across all installed slots.

Suffix Breakdown & Model Matrix

The suffix “/K” represents a series revision identifier within the 1756 chassis platform lineage. “A13” defines a 13-slot ControlLogix chassis configuration. No additional functional segmentation is defined by the manufacturer for this ordering code.

Hardware Specifications

ControlLogix Backplane Communication and I/O Density Scaling

The 1756-A13/K chassis implements a unified backplane architecture where all installed modules share a synchronized electrical and timing bus. Backplane rails at 1.2 VDC and 3.3 VDC support internal logic domains, while 5.1 VDC and 24 VDC rails distribute I/O and auxiliary module power. The ControlLogix backplane operates with deterministic scheduling, allowing coordinated data exchange between modules without discrete inter-module wiring.

I/O density scaling is achieved through slot-based architecture, where up to 13 modules operate under a shared communication backbone, maintaining aligned scan execution across controller and I/O subsystems.

Frequently Asked Questions (FAQ)

Q: Does the 1756-A13/K support hot-swapping of modules?
A: Yes. ControlLogix architecture allows hot-swap insertion and removal. Electrical state handling is managed at module firmware level, not by the chassis.

Q: Are backplane power rails isolated per slot?
A: No. The chassis provides shared backplane distribution. Current limits are enforced per rail and per slot depending on system loading.

Q: Does the chassis provide slot-to-slot electrical isolation?
A: No. Isolation is implemented within individual modules. The chassis functions as a common backplane bus structure.

Field Installation Guidelines

• Install chassis in horizontal orientation only as specified by mechanical design constraints

• Ensure 8 AWG functional earth and 14 AWG protective earth conductors are properly terminated

• Verify backplane connector alignment before inserting modules to avoid pin deformation

• Maintain cabinet clearance to support airflow due to open-frame chassis design

• Distribute high-load modules across slots to avoid localized backplane rail stress

• Ensure cabinet grounding integrity to minimize electrical noise coupling into backplane bus