1756-A7 ControlLogix 7-Slot Chassis | Allen-Bradley

The Original New Allen-Bradley 1756-A7 ControlLogix 7-Slot Chassis is the foundational backplane for building ControlLogix automation systems. It provides the physical mounting and high-speed communication backbone for ControlLogix controllers, I/O modules, communication adapters, and specialty modules. The chassis backplane distributes power to each installed module and enables seamless data exchange between all system components. Designed for horizontal back-panel mounting in industrial control cabinets, the 1756-A7 supports 7 slots and is available in Series B (0-60°C) and Series C (-25-60°C) versions. All empty slots must be fitted with slot fillers to maintain proper airflow and cooling.

Core Engineering Highlights:
7 module slots for flexible system configuration | High-speed ControlBus backplane | Horizontal back-panel mounting only | 15A @ 5.1V DC / 2.8A @ 24V DC backplane current | 4.5W power dissipation | 0°C to 60°C (Series B) / -25°C to 60°C (Series C) operating temperature

Key Features:

• Original New Allen-Bradley 1756-A7 chassis

• 7 slots for ControlLogix 1756 series modules

• High-speed ControlBus backplane for rapid data exchange between modules

• Horizontal back-panel mounting only

• Modular design allows mixing controllers, I/O, communication, and specialty modules

• Hot-swappable module replacement without powering down the entire system

• High-current backplane: 15A @ 5.1V DC, 2.8A @ 24V DC

• Open-style enclosure (IP20) with convection cooling

• Series C version supports extreme temperature environments (-25°C to 60°C)

• Rugged construction for demanding industrial environments

• UL Listed, CE marked, ATEX and IECEx certified

Applications:

• Central backplane for ControlLogix and GuardLogix control systems

• Manufacturing automation and production line control

• Process control (chemical, pharmaceutical, food & beverage)

• Material handling and conveyor systems

• Water treatment and power generation facilities

• Machine control and robotics applications

• Legacy system upgrades and retrofit projects

Technical Specifications:

• Catalog Number: 1756-A7

• Product Type: ControlLogix Chassis

• Number of Slots: 7

• Series: B (Standard) / C (Extended Temperature)

• Backplane Current (Max):

  • 1.5A @ 1.2V DC

  • 4A @ 3.3V DC

  • 15A @ 5.1V DC

  • 2.8A @ 24V DC

• Power Dissipation: 4.5W

• Mounting: Horizontal back-panel mounting only

• Minimum Cabinet Size: 50.8 x 60.9 x 20.3 cm (20 x 24 x 8 in.)

• Dimensions (W x H x D): 367.6 x 158 x 145 mm (14.47 x 6.22 x 5.71 in.)

• Weight: Approx. 1.10 kg (2.4 lbs)

• Enclosure Type: Open-style (IP20)

• Mounting: Horizontal back-panel mounting only

• Operating Temperature (Series B): 0°C to 60°C (32°F to 140°F)

• Operating Temperature (Series C): -25°C to 60°C (-13°F to 140°F)

• Storage Temperature: –40°C to 85°C

• Relative Humidity: 5% to 95% non-condensing

• Vibration: 2g @ 10-500Hz

• Shock: 30g operational, 50g non-operational

• Slot Fillers: All empty slots must use a slot filler

• Certifications: CE, UL, cULus, CSA, ATEX, IECEx, RoHS

• Lifecycle Status: Active

• Country of Origin: US

System Compatibility:

• Rockwell Automation ControlLogix 1756 controllers (all series)

• GuardLogix safety controllers

• 1756 I/O modules (digital, analog, specialty, diagnostic, motion control)

• 1756 communication modules (EtherNet/IP, ControlNet, DeviceNet)

• 1756 power supplies (1756-PA72, 1756-PB72, etc.)

• 1756 redundancy modules

• Conformally coated chassis version available (1756-A7K)

Related Products:

• 1756-A7K – Conformally coated version for harsh environments

• 1756-PA72 – ControlLogix AC power supply (120/240V AC, 75W)

• 1756-PB72 – ControlLogix DC power supply (24V DC, 75W)

• 1756-L73 – ControlLogix 5570 controller, 2MB memory

• 1756-L74 – ControlLogix 5570 controller, 4MB memory

• 1756-EN2T – EtherNet/IP communication module

• 1756-IB32 – 32-point digital input module

• 1756-OB32 – 32-point digital output module

• 1756-RM – Redundancy module for mission-critical applications

• 1756-BA1 – Lithium battery backup for controller memory

PLC ERA is an independent industrial automation distributor supplying 100% genuine Original New products through established global supply channels. Allen-Bradley, ControlLogix, and GuardLogix are trademarks of Rockwell Automation.