Description
Product Name: 1771-A1B Allen Bradley Programmable controller
Product details:
The 1771-A1B is a universal, open-style I/O chassis assembly designed to house and provide a communication path for various 1771 series modules.
Product Parameters (Specifications)
| Feature | Specification |
| Product Type | I/O Chassis / Rack Assembly |
| Series | PLC 5 (Programmable Logic Controller 5) |
| Part Number | 1771-A1B |
| Number of Slots | 4 Slots (Typically reserved for a processor/adapter module, I/O modules, or power supply modules) |
| Mounting Type | Back Panel Mount |
| Max Backplane Current (at 5V DC) | 16 Amperes |
| Voltage Rating | 5.25 Volts DC (Backplane) |
| Dimensions (H x W x D) | Approx. $315 \times 229 \times 193 \text{ mm}$ ($12.4 \times 9.0 \times 7.6 \text{ in}$) |
| Weight | Approx. $3.6 \text{ kg}$ ($8.0 \text{ lbs}$) |
| Enclosure Type | Open Style (Requires mounting within a suitable external enclosure) |
| Power Sources | Can be powered by: Processors with integral power supplies, Power Supply Modules, or External Power Supplies (must use one source at a time). |
Product Advantages (Key Features)
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PLC-5 System Backbone: It provides the essential structure and communication bus for the highly reliable and widely used Allen-Bradley PLC-5 control system.
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Modularity and Flexibility: The 4-slot design offers a compact solution for integrating a mix of I/O modules, power supplies, and processor/adapter modules.
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Robust Communication: It facilitates the communication path between the controller or I/O adapter module and the installed I/O modules.
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Power Versatility: It can accommodate different power configurations (integral processor power, power supply modules, or external supplies) through a dedicated jumper switch.
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Compact Form Factor: The smaller slot count makes it suitable for applications with limited space or smaller control requirements.
Important Considerations (Notes)
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Discontinued Status: The 1771-A1B is a legacy product, and the manufacturer (Rockwell Automation/Allen-Bradley) has officially discontinued it. This means new parts are scarce, and support relies primarily on surplus/refurbished providers.
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Enclosure Requirement: It is an “open type” equipment and must be mounted within a suitably designed, protective enclosure to prevent physical damage, ensure safety from live parts, and meet environmental requirements (e.g., Pollution Degree 2).
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Power Configuration: The chassis has a jumper switch (typically labeled ‘Y’ and ‘N’) to select the power source. It is crucial not to connect both a power supply module and an external power supply simultaneously.
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Grounding and EMI: Proper grounding using at least 8 AWG copper wire is required to comply with electrical codes and guard against Electromagnetic Interference (EMI). Shielded cables may be necessary for certain connections.
Product Application (Typical Use)
The 1771-A1B chassis is typically used in industrial automation and control environments as a local or remote I/O rack for the Allen-Bradley PLC-5 processor.
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Small Control Systems: Its 4-slot capacity makes it ideal for smaller, localized control tasks or simple machine control applications where a full-sized rack is not needed.
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Distributed I/O: It can function as an I/O expansion rack located remotely from the main processor using a suitable I/O adapter module.
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Housing for Core Modules: It provides a reliable mounting structure for the PLC-5 processor itself (if using the chassis as the main location), power supply modules, and various 1771 series I/O modules (digital, analog, etc.).
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
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