Allen-Bradley 1756-A17 ControlLogix 17-Slot Chassis

The Allen-Bradley 1756-A17 is a high-capacity, 17-slot chassis designed to serve as the structural and electrical backbone of a ControlLogix automation system. This open-style enclosure provides a secure mounting platform for I/O modules, communication adapters, and motion control hardware, facilitating high-speed backplane communication and efficient power distribution throughout the rack.

Features

• 17-slot capacity for extensive I/O and controller density.
• Integrated backplane for high-speed data exchange between modules.
• Supports Removal and Insertion Under Power (RIUP) for maintenance without system downtime.
• Electronic keying capabilities to prevent the installation of incorrect module types in configured slots.
• Sequence of Events (SOE) timestamping support for precise process monitoring.
• Rugged design with 10 mounting tabs (5 top, 5 bottom) for secure panel installation.

Applications

• Automotive assembly lines requiring centralized control logic.
• Large-scale water and wastewater treatment facilities.
• Food and beverage production lines needing integrated controller gateways.
• Warehousing and logistics systems utilizing variable frequency drive control and sorting logic.

Technical Specifications

Installation Guidelines

• Mounting: Use all 10 provided mounting tabs for secure panel attachment. Ensure sufficient clearance for heat dissipation: 15.3 cm (6.0 in.) top, 5.1 cm (2.0 in.) bottom, and side clearances based on the power supply width.
• Grounding: Always connect the chassis to a verified Functional Earth (8.3 mm² / 8 AWG) and Protective Earth (2.1 mm² / 14 AWG) to maintain noise immunity and electrical safety.
• Hardware: Compatible with both SEM and standard Phillips screw mounting configurations. Follow torque specifications for secure seating of the chassis against the subpanel.
• Environment: Designed for controlled industrial environments; ensure the area is free from excessive moisture, conductive dust, or corrosive contaminants, as this unit does not feature a conformal coating.
• Safety: Always power down the system before performing wiring or module installation unless specifically performing a hot-swap operation according to the manufacturer's safety manual.

FAQ

Is the 1756-A17 chassis compatible with all ControlLogix modules?

Yes, the 1756-A17 is designed to support the standard range of ControlLogix I/O, communication, and controller modules. Always verify the specific module power requirements against the chassis backplane current limits.

What is the recommended cabinet space for this chassis?

The chassis requires a minimum installation space of 76.2 x 91.4 x 20.3 cm (30 x 36 x 8 in.) to ensure proper airflow and accessibility.

Does this unit support hot-swapping?

Yes, the ControlLogix architecture supports RIUP (Removal and Insertion Under Power), allowing you to replace modules while the chassis remains energized.