The Allen-Bradley 1756-A4 is a 4-slot chassis from the ControlLogix series manufactured by Rockwell Automation. It serves as the mechanical and electrical housing for ControlLogix system components such as processors, communication modules, and I/O modules. This modular backplane provides the physical and logical infrastructure required for communication between modules and connection to external control systems.
Compact and rugged, the 1756-A4 is ideal for applications that require a small number of modules or for decentralized systems where space-saving is essential. It provides backplane communication and module power distribution while maintaining high reliability and flexibility in system design.
Specifications and Parameters
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Catalog Number | 1756-A4 |
| Product Type | ControlLogix Chassis |
| Number of Slots | 4 |
| Power Supply Location | Left side only |
| Module Type | Chassis |
| Power Dissipation (Max) | 4 Watts |
| Mounting | Horizontal |
| Weight | 0.68 kilograms |
| Backplane Current (5 Volts DC) | 10 amps |
| Backplane Current (24 Volts DC) |
2.8 amps |
Functional Overview
The 1756-A4 chassis acts as the central framework for a ControlLogix automation system. It:
Physically houses up to four modules, each connected via the integrated backplane.
Distributes power supplied by a left-mounted power supply to each module through the backplane.
Enables high-speed communication between the controller and other modules such as I/O or communication modules.
Supports real-time data exchange with reliable signal integrity across all installed modules.
The chassis does not perform logic execution or I/O processing directly. These tasks are managed by the processor and modules installed into the chassis. The 1756-A4 simply provides the physical and electrical support to enable these modules to function as a system.
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