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- 33 × 15 × 13 cm
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1756-A4 ControlLogix 4-Slot Chassis – Detailed Technical Overview
Product Overview
The 1756-A4 is a compact 4-slot ControlLogix chassis used in industrial automation systems to house PLC modules such as CPU units, I/O modules, and communication modules.
It provides the mechanical structure, electrical backplane communication, and power distribution required for small-scale ControlLogix systems.
This chassis is designed for applications where limited space is available but modular PLC functionality is still required.
It is commonly used in compact machines, standalone automation units, and small distributed control systems.
Brand Information
| Item | Details |
|---|---|
| Brand | ControlLogix platform manufacturer |
| Product Model | 1756-A4 |
| Product Type | PLC Chassis / Rack |
| Product Family | ControlLogix 1756 Series |
| Series | ControlLogix Modular Control System |
| Function | Module housing + backplane communication |
| Installation Type | Panel-mounted chassis |
Product Series Introduction
ControlLogix Modular Platform
The ControlLogix system is a modular PLC architecture designed for scalable industrial automation.
It uses a chassis-based structure where modules communicate through a high-speed backplane rather than external wiring.
The 1756-A4 chassis provides 4 slots for system modules, making it suitable for compact automation systems.
Despite its small size, it supports the same ControlLogix modules as larger chassis models.
Detailed Technical Specifications of 1756-A4
| Parameter | Specification |
|---|---|
| Model | 1756-A4 |
| Product Type | ControlLogix Chassis |
| Number of Slots | 4 slots |
| Backplane Communication | High-speed ControlLogix backplane |
| Mounting Type | Panel mounting |
| Compatible Modules | All ControlLogix 1756 modules |
| Power Supply Location | Left-side external power module |
| Backplane Voltage Levels | 1.2V / 3.3V / 5.1V / 24V DC |
| Backplane Current @ 1.2V DC | 1.5 A |
| Backplane Current @ 3.3V DC | 4 A |
| Backplane Current @ 5.1V DC | 15 A |
| Backplane Current @ 24V DC | 2.8 A |
| Power Dissipation | Low thermal load |
| Isolation | Module-dependent |
| Cooling Method | Natural convection |
| Enclosure Type | Open chassis |
| 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 | 33 × 15 × 13 cm |
| Weight (kg) | ~0.9 kg |
Product Features
1. Compact 4-Slot Design
Provides space for up to 4 ControlLogix modules, suitable for compact automation systems.
2. High-Speed Backplane Communication
Ensures fast and deterministic communication between installed modules.
3. Modular Flexibility
Any compatible ControlLogix module can be installed in any slot.
4. Space-Saving Structure
Designed for control panels with limited installation space.
5. Industrial Durability
Built for stable operation in industrial environments with vibration and temperature variation.
Product Applications
Compact Machine Control
Used in small automated machines and standalone equipment systems.
Packaging Equipment
Common in compact packaging machines requiring PLC control.
Small Production Lines
Used in small-scale manufacturing automation systems.
OEM Equipment
Integrated into original equipment manufacturer control panels.
Laboratory Automation
Used in test benches and industrial laboratory systems.
Product Advantages
| Advantage | Description |
|---|---|
| Compact Size | Ideal for space-limited installations |
| 4-Slot Architecture | Supports essential system modules |
| High-Speed Backplane | Fast internal communication |
| Flexible Module Placement | Any-slot configuration |
| Industrial Reliability | Stable long-term operation |
| Low Power Consumption | Efficient energy use |
| Easy Installation | Simple panel mounting |
| Modular Expansion | Upgradeable system design |
Recommended Models from Same Series or Related Series
| Model | Product Type | Main Function | Application | Dimensions | Weight (kg) |
|---|---|---|---|---|---|
| 1756-A4 | ControlLogix Chassis | 4-slot rack | Compact systems | 33 × 15 × 13 cm | 0.9 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-large 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 |
| 1756-A17 | ControlLogix Chassis | 17-slot rack | Extended systems | ~75 × 76 × 20 cm | ~2.2 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 ControlLogix 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 systems | 15 × 12 × 5 cm | 0.36 kg |
System Role in Industrial Automation
The 1756-A4 chassis serves as the foundation of compact ControlLogix systems.
It provides structural support and high-speed backplane communication for PLC modules in small automation applications.
Its modular design allows engineers to build efficient and space-saving control systems.
Installation and Maintenance Characteristics
The chassis is installed inside control cabinets using standard panel mounting.
Modules are inserted directly into slots without additional internal wiring.
Maintenance is simple due to modular replacement capability and standardized ControlLogix architecture.
Proper ventilation is recommended for stable long-term operation.
Industrial Reliability
The 1756-A4 is designed for continuous industrial operation in compact automation systems.
It offers stable mechanical support and reliable backplane communication between modules.
Its durability ensures long service life in industrial environments.
Summary
The Allen Bradley 1756-A4 is a compact 4-slot ControlLogix chassis designed for small industrial automation systems.
It provides modular flexibility, high-speed communication, and reliable mechanical structure in a space-efficient design.
Its simplicity and compatibility make it a widely used platform for compact PLC applications.