1756-A7 Allen-Bradley ControlLogix 7 Slot PLC Chassis Rack

Overview

The Allen-Bradley 1756-A7 is a ControlLogix chassis designed to house and interconnect multiple 1756 series modules within a modular automation system. It provides a structured backplane platform for processor, I/O, and communication modules, enabling scalable system configuration in industrial control cabinets.

Chassis Architecture & Capacity

• Slot Count: 7 module positions

• Backplane Design: High-speed ControlLogix communication backplane

• System Expansion: Supports mixed configuration of control, I/O, and communication modules

• Enclosure Style: Open-frame chassis (no integrated cabinet housing)

• Mounting Type: Panel-mounted structure for control cabinet integration

Electrical Backplane Ratings

• 1.2 V DC Backplane Current Capacity: 1.5 A per chassis

• 3.3 V DC Backplane Capacity: Up to 4 A per slot (system dependent allocation)

• Engineered for stable distributed power and deterministic communication across installed modules

• Supports high-speed module synchronization within ControlLogix architecture

Mechanical Construction

• Mounting Configuration:

• 2 top mounting tabs

• 2 bottom mounting tabs

• Fastener Compatibility: SEM screws and standard Phillips screws

• Compatible washer types: flat, star, and split lock washers

• Weight: 2.06 lbs

• Compact industrial-grade metal frame designed for long-term cabinet installation

Environmental Ratings

• Operating Temperature Range: -25°C to 65°C

• Suitable for industrial environments with vibration, heat variation, and continuous-duty operation

• No conformal coating applied (standard industrial protection level)

System Compatibility

• Designed for Allen-Bradley ControlLogix 1756 series modules

• Supports processor, communication, and distributed I/O modules within the same rack

• Enables flexible system scaling through modular slot configuration

• Recommended for use in centralized and distributed automation architectures

Engineering Notes

• Ensure proper thermal spacing between installed modules for heat dissipation

• Backplane load distribution should be considered during system design

• Suitable for both standalone and multi-rack ControlLogix configurations

• Open chassis design requires installation within a protective industrial enclosure

Applications

• Industrial control cabinet system integration

• Machine automation platforms

• Process control and monitoring systems

• High-density PLC rack installations

• Distributed modular control system expansion

FAQ

Q1: Does the 1756-A7 include a power supply?
No, the chassis only provides module housing and backplane connectivity. A separate power supply is required.

Q2: Can different ControlLogix modules be mixed in the same chassis?
Yes, it supports mixed module configurations within the 7-slot architecture.

Q3: Is the chassis enclosed?
No, it is an open-style chassis designed for installation inside an industrial enclosure.