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Allen-Bradley 1746-A4 SLC 500 Modular Chassis

1. Product Description

The 1746-A4 is a 4-slot modular chassis designed for Allen-Bradley’s SLC 500 series programmable logic controllers (PLCs). It serves as the physical framework for mounting processor modules, I/O modules, and power supplies, enabling flexible system configurations in industrial automation applications .

2. Key Features

4-Slot Design – Accommodates up to 4 SLC 500 modules (e.g., processors, I/O, or communication modules) .
Robust Construction – Built with durable materials to withstand harsh industrial environments, including vibration and temperature fluctuations .
Power Distribution – Integrates with SLC 500 power modules (e.g., 1746-P1, 1746-P3) to supply power to installed modules .
Modular Flexibility – Compatible with all SLC 500 series I/O, processor, and communication modules, allowing customized system builds .
Easy Maintenance – Supports hot-swapping (module replacement without powering down the system) when used with compatible components .

3. Technical Specifications

Parameter	Specification
Slot Capacity	4 slots
Compatible Modules	SLC 500 series (e.g., 1746-IB16, 1746-OB16, 1746-NI4)
Mounting	DIN rail or panel
Operating Temp.	0°C to 60°C (32°F to 140°F)
Certifications	CE, UL, CSA

4. Applications

Manufacturing Automation – Assembly line control and monitoring .
Process Industries – Chemical and water treatment plant automation .
Building Automation – HVAC and lighting control systems .

5. Installation & Precautions

Power Requirements – Ensure proper power module (e.g., 1746-P3) is installed to avoid overloading .
Module Placement – Reserve the leftmost slot for the processor module in most configurations .
Environmental Limits – Avoid condensation or extreme temperatures beyond specifications .