Allen-Bradley 1756-A4 4-Slot 4W ControlLogix Chassis

Product Overview

The Allen-Bradley 1756-A4 is a 4-slot chassis for ControlLogix systems. It provides backplane power distribution for up to four I/O modules. 

Key Specifications

• Brand: Allen-Bradley / Rockwell Automation
• Model: 1756-A4
• Series: ControlLogix
• Module Type: Chassis / Backplane
• Slots: Four (4)
• Dimensions: 20 × 20 × 8 inches
• Weight: 1.7 pounds (0.75 kilograms)
• Available Series: Series A, B, C

Power Specifications

• Power Dissipation (Max): 4 Watts
• Backplane Current (5 Volts DC): 10 Amps
• Backplane Current (24 Volts DC): 2.8 Amps

Backplane Current Ratings

• 1.2V DC: 1.5A (chassis) / - (slot)
• 3.3V DC: 4A (chassis) / 4A (slot)
• 5.1V DC: 15A (chassis) / 6A (slot)
• 24V DC: 2.8A (chassis) / 2.8A (slot)

Additional Features

• Operating Altitude: Up to 2000 meters
• Installation Type: Panel Mount
• Compatible with all ControlLogix modules
• Multiple series available (A, B, C) for flexibility

Key Features

• 4-slot capacity for modular I/O expansion
• High backplane current capacity: 10A at 5V
• Low power dissipation: only 4W max
• Panel mount design for secure installation
• Up to 2000m altitude operation
• Compatible with Series A, B, and C modules

Package Contents

• 1x 1756-A4 ControlLogix Chassis
• Mounting hardware kit
• Installation instructions

FAQ

Q: How many modules can the 1756-A4 accommodate?

A: The 1756-A4 has four slots and can accommodate up to four ControlLogix I/O modules or controllers.

Q: What is the maximum backplane current available?

A: The chassis provides 10A at 5V DC and 2.8A at 24V DC. Individual slot limits are 6A at 5.1V and 2.8A at 24V.

Q: What is the difference between Series A, B, and C?

A: Later series include minor revisions and improvements. All are functionally compatible with standard ControlLogix modules.