Description
Product Name: 1756-A4/B Allen Bradley Controller module
Product details:
The Allen-Bradley 1756-A4/B is a ControlLogix Standard Chassis with four (4) slots. As a key component of the Rockwell Automation ControlLogix system, its primary function is to provide the physical backplane connections and power distribution for various ControlLogix modules, including processors (CPUs), I/O modules, and communication adapters.
The “/B” at the end of the part number denotes the product’s Series B, which typically indicates a revision or updated version of the original design, often with minor enhancements or compliance updates.
2. Product Parameters (Specifications)
| Attribute | Specification Details |
| Product Type | ControlLogix Standard Chassis |
| Part Number | 1756-A4/B |
| Number of Slots | 4 |
| Series | Series B |
| Mounting | Horizontal, back-panel mounting only |
| Backplane Current (Max) | @ 1.2V DC: 1.5 A |
| @ 3.3V DC: 4 A | |
| @ 5.1V DC: up to 15 A (up to 6 A per slot) | |
| @ 24V DC: 2.8 A | |
| Power Dissipation (Max) | Approximately 4 Watts |
| Dimensions (Approx.) | 7.0 in x 6.0 in x 7.0 in (17.8 cm x 15.2 cm x 17.8 cm) – Varies slightly by source |
| Weight (Approx.) | 0.7 kg (1.7 lb) |
| Enclosure Type | Open (Requires mounting in a suitable industrial enclosure) |
| Compatible Power Supplies | Requires a dedicated ControlLogix power supply (e.g., 1756-PA75, 1756-PB75) |
3. Product Advantages
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High-Speed Communication: The backplane provides a robust and high-speed communication path, essential for the demanding data exchange between high-performance ControlLogix modules.
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Removal and Insertion Under Power (RIUP): This feature allows for easy maintenance and replacement of modules without having to shut down the entire system, significantly improving uptime.
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Electronic Keying: A built-in feature that helps prevent replacement errors by ensuring that only the correct module type can be inserted into a specific chassis slot, reducing the risk of system damage or misconfiguration.
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Modularity and Scalability: As a core component of the ControlLogix platform, it supports a highly modular and flexible architecture, allowing users to select the exact mix of I/O, control, and communication modules needed for their application.
4. Important Considerations (Notes)
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Power Supply: A separate ControlLogix power supply (e.g., a 1756-P… model) must be installed into a dedicated slot on the left side of the chassis to power the backplane and all installed modules.
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Horizontal Mounting: The chassis is designed for horizontal-only mounting inside a panel. Incorrect orientation can affect cooling and performance.
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Empty Slots: Any unused slots in the chassis must be filled with a slot filler module (e.g., 1756-N2) to maintain proper airflow and meet regulatory requirements.
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Current Load: Users must carefully calculate the current draw of all installed modules to ensure the total backplane current does not exceed the chassis’s maximum current capacity at any of the voltage levels (1.2V, 3.3V, 5.1V, and 24V DC).
5. Product Applications
The 1756-A4/B chassis is used in a wide variety of industrial automation and control applications that require a compact, but powerful, PLC or PAC system:
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Small-to-Medium Control Systems: Ideal for applications that don’t require a large number of I/O modules but still demand the high performance of a ControlLogix processor.
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Distributed I/O Node: Can be used remotely as a network node (e.g., over EtherNet/IP or ControlNet) to handle local I/O for a larger, central ControlLogix system.
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Process Control: Used in industries like Food & Beverage, Water/Wastewater, and Pharmaceuticals for localized control and data acquisition.
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Machine Control: Suitable for advanced machine control applications where a dedicated, high-speed controller with a few communication or I/O modules is needed.
Advantages: Foxboro, OVATION, TRICONEX, Allen-Bradley, ABB, Motorola, Siemens Moore, Ge Fanuc, Woodward, Bently Nevada and other major import brands!
We have the same series of models in stock. If you don’t find the model you need, please contact us and we will provide you with an official quotation！
Colour：new Warranty: 12 months
Lead Time：3-day working day Country of origin: Sweden
Price: Please contact us Product weight：0.515kg
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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