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- 26.2 × 15.8 × 14.5 cm
- 0.75kg
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1756-A4K ControlLogix 4-Slot Chassis – Full Technical Overview
Product Overview
The 1756-A4K is a 4-slot ControlLogix chassis used in industrial automation systems as the core mounting and communication platform for PLC modules.
It provides mechanical support, electrical backplane connectivity, and power distribution for ControlLogix I/O modules, CPU modules, and communication modules.
The “K” suffix typically indicates a regional or packaging variation, but the core structure and electrical performance remain aligned with the standard 1756-A4 chassis architecture.
This chassis is widely used in compact automation systems where space is limited but modular PLC functionality is still required.
Brand Information
| Item | Details |
|---|---|
| Brand | Industrial automation ControlLogix platform |
| Product Model | 1756-A4K |
| Product Type | PLC Chassis / Rack |
| Product Family | ControlLogix 1756 Series |
| Series | ControlLogix Modular Control System |
| Function | Module housing + high-speed backplane |
| Installation Type | Panel-mounted chassis |
Product Series Introduction
The ControlLogix system is a modular PLC platform designed for scalable industrial automation.
It uses a chassis-based architecture where all modules communicate through a high-speed backplane rather than individual wiring.
The 1756-A4K is part of the small chassis category, designed for compact systems while maintaining full compatibility with ControlLogix modules.
It allows users to build flexible automation systems with CPU, I/O, and communication modules in a single rack.
Detailed Technical Specifications of 1756-A4K
| Parameter | Specification |
|---|---|
| Model | 1756-A4K |
| Product Type | ControlLogix Chassis |
| Number of Slots | 4 slots |
| Backplane Communication | High-speed ControlLogix backplane |
| Compatible Modules | All 1756 ControlLogix modules |
| Mounting Type | Horizontal panel mounting |
| Power Supply Location | Left-side external supply |
| Backplane Voltage Levels | 1.2V / 3.3V / 5.1V / 24V DC |
| Backplane Current @ 5.1V DC | Up to 15 A chassis level |
| Backplane Current @ 24V DC | Up to 2.8 A |
| Power Dissipation | ~4–5 W |
| Isolation | Module-dependent |
| Cooling Method | Natural convection |
| Enclosure Type | Open chassis frame |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5%–95% non-condensing |
| Vibration Resistance | Industrial grade (2 g) |
| Shock Resistance | 30 g operating / 50 g non-operating |
| Dimensions | ~26.2 × 15.8 × 14.5 cm |
| Weight (kg) | ~0.75 kg |
(Dimensions are consistent with 1756-A4 chassis family specifications, with minor regional variation for A4K variants.)
Product Features
1. Compact 4-Slot Design
Supports up to 4 ControlLogix modules, ideal for small and compact automation systems.
2. High-Speed Backplane
Provides deterministic communication between CPU, I/O, and communication modules without external wiring.
3. Flexible Module Placement
Any compatible module can be installed in any slot, simplifying system design.
4. Industrial Mechanical Strength
Built for vibration resistance and stable operation in industrial environments.
5. Efficient Power Distribution
Distributes multiple voltage levels across modules through the integrated backplane system.
Product Applications
Small Industrial Automation Systems
Used in compact PLC systems controlling small machines and standalone equipment.
Packaging Machinery
Applied in compact packaging lines requiring fast and reliable control.
OEM Equipment
Integrated into original equipment manufacturer control panels.
Laboratory Automation
Used in testing systems and industrial lab automation setups.
Auxiliary Control Panels
Used as secondary control systems in larger distributed automation architectures.
Product Advantages
| Advantage | Description |
|---|---|
| Compact Structure | Suitable for space-limited cabinets |
| 4-Slot Modularity | Supports essential control components |
| High-Speed Backplane | Fast internal communication |
| Flexible Configuration | Any-slot module placement |
| Industrial Reliability | Stable long-term operation |
| Low Power Consumption | Efficient electrical design |
| Easy Installation | Standard panel mounting |
| Maintenance Friendly | Modular replacement design |
Recommended Models from Same Series or Related Series
| Model | Product Type | Main Function | Application | Dimensions | Weight (kg) |
|---|---|---|---|---|---|
| 1756-A4 | ControlLogix Chassis | Standard 4-slot rack | Compact systems | 26.2 × 15.8 × 14.5 cm | 0.75 kg |
| 1756-A4K | ControlLogix Chassis | 4-slot variant | Small automation systems | ~26.2 × 15.8 × 14.5 cm | 0.75 kg |
| 1756-A7 | ControlLogix Chassis | 7-slot rack | Medium systems | ~42 × 17 × 14 cm | ~1.2 kg |
| 1756-A10 | ControlLogix Chassis | 10-slot rack | Mid-size systems | 50.8 × 76.2 × 20.3 cm | 1.45 kg |
| 1756-A13 | ControlLogix Chassis | 13-slot rack | Large systems | 58.8 × 16.9 × 14.5 cm | 1.9 kg |
Recommended Popular Models from Same Brand
| Model | Product Category | Main Features | Application Area | Dimensions | Weight (kg) |
|---|---|---|---|---|---|
| 1756-L71 | CPU Module | High-performance controller | Large automation systems | 20 × 15 × 10 cm | 0.90 kg |
| 1756-L73 | CPU Module | Advanced processing CPU | Distributed control systems | 20 × 15 × 10 cm | 0.95 kg |
| 1756-EN2TR | Ethernet Module | Dual Ethernet/IP ports | Industrial networking | 14 × 11 × 8 cm | 0.45 kg |
| 1756-IF8 | Analog Input Module | 8-channel input | Process control | 15 × 12 × 5 cm | 0.35 kg |
| 1756-OF8 | Analog Output Module | 8-channel output | Precision control | 15 × 12 × 5 cm | 0.36 kg |
System Role in Industrial Automation
The 1756-A4K acts as the structural foundation for small ControlLogix automation systems.
It supports high-speed communication between modules and ensures stable power distribution across the system.
Its modular design allows engineers to build compact yet flexible PLC architectures.
Installation and Maintenance Characteristics
The chassis is installed in control cabinets using horizontal panel mounting.
Modules are inserted directly into slots without internal wiring, reducing installation complexity.
Maintenance is simplified through modular replacement of individual components.
Proper ventilation is required to maintain thermal stability.
Industrial Reliability
The 1756-A4K is designed for continuous industrial operation in compact automation environments.
It provides stable mechanical structure and reliable backplane communication under industrial conditions.
Its durability ensures long service life in demanding applications.
Summary
The Allen Bradley 1756-A4K is a compact 4-slot ControlLogix chassis designed for small-scale industrial automation systems.
It provides modular flexibility, high-speed communication, and robust mechanical design in a space-efficient format.
It is widely used in compact PLC systems requiring reliable and scalable control architecture.