The Allen-Bradley 1756-A4 is a standard four-slot chassis designed for the ControlLogix platform. This chassis serves as the physical foundation for the modular ControlLogix system, providing the necessary backplane communication and power distribution for installed I/O, communication, and controller modules. It is engineered for industrial environments requiring a compact, high-performance rack-based architecture.
Features
Supports up to 4 ControlLogix modules in a single chassis.
Optimized for horizontal mounting configurations.
Robust backplane design supporting high-speed data transfer between modules.
Efficient power distribution with 10A current capacity at 5V DC and 2.8A at 24V DC.
Open-style enclosure suitable for installation within standard industrial control cabinets.
Technical Specifications
Catalog Number
1756-A4
Slot Capacity
4 Slots
Mounting
Horizontal
Backplane Current (5V DC)
10 Amps
Backplane Current (24V DC)
2.8 Amps
Power Dissipation (Max)
4 Watts
Enclosure Type
Open
Installation Guidelines
Ensure the chassis is mounted on a flat, rigid surface to prevent vibration-induced stress on the backplane connectors.
Maintain proper clearance above and below the chassis for adequate airflow and heat dissipation.
Always disconnect all power sources from the chassis before inserting or removing any ControlLogix modules.
Ensure the chassis is correctly grounded to the enclosure backplane to minimize electromagnetic interference (EMI).
Use only compatible ControlLogix series modules to prevent backplane damage or communication errors.
FAQ
Can the 1756-A4 be mounted vertically? The 1756-A4 is specifically designed for horizontal mounting. Vertical mounting may restrict airflow and lead to thermal issues; please consult the official Allen-Bradley installation manual for specific orientation requirements.
Does this chassis include a power supply? No, the 1756-A4 is a passive chassis. A separate ControlLogix power supply module must be installed in the designated slot to provide power to the backplane.
