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Allen-Bradley 1756-A4 ControlLogix 4-Slot Chassis

Product Description

The 1756-A4 is a 4-slot chassis designed for Allen-Bradley ControlLogix systems, serving as the physical backbone for housing controllers, I/O modules, communication interfaces, and power supplies. It features a high-speed backplane that enables seamless communication between modules, supporting distributed control architectures in industrial automation applications .

Key Features

Modular & Scalable Design
- 4-slot configuration for flexible module placement (any slot can host controllers, I/O, or communication modules) .
- Compatible with 4, 7, 10, 13, and 17-slot chassis for system expansion .
High-Speed Backplane
- Supports real-time data exchange between modules (e.g., controllers, I/O, and network interfaces) .
- Enables multi-controller architectures (e.g., redundant or distributed control).
Robust Construction
- Durable metal housing with IP20 rating (requires enclosure for harsh environments) .
- Horizontal mounting only (rear-panel installation) .
Power Supply Compatibility
- Works with 1756-PA72, 1756-PB72, 1756-PA75, 1756-PB75, 1756-PC75, and 1756-PH75 power modules .
- Backplane current ratings:
  - 1.2V DC: 1.5A per slot
  - 3.3V DC: 4A per slot
  - 5.1V DC: 6A per slot
  - 24V DC: 2.8A per slot .
Easy Installation
- Removable slot fillers (1756-N2) for unused slots .
- Standard DIN rail or panel mounting options .

Technical Specifications

Parameter	Value
Model	1756-A4
Slot Configuration	4 slots (0–3)
Dimensions (W×H×D)	263 × 169 × 145 mm (10.35 × 6.65 × 5.71 in)
Weight	0.75 kg (1.7 lbs)
Power Consumption	1.8W (6.1 BTU/hr)
Operating Temp.	0°C to +60°C
Certifications	CE, UL, TÜV (industrial use) .

Applications

Process Automation (oil & gas, chemical plants) .
Manufacturing (conveyors, packaging machines) .
Power Distribution (redundant control systems) .

Installation & Usage Notes

Power Supply
- Install power modules in the leftmost slot .
- Ensure proper grounding to avoid EMI interference .
Module Placement
- No slot restrictions (controllers, I/O, or comms modules can be placed in any slot) .
Maintenance
- Regularly inspect terminal connections and cooling vents .