Allen-Bradley 1771-A4B PLC-5 16-Slot I/O Chassis Rack
$123.00
$320.00
Description
Overview
The Allen-Bradley 1771-A4B universal chassis is a modular PLC rack engineered for PLC-5 and 1771 Series control systems. Designed with a 16-slot architecture, this chassis supports a wide range of processor, communication, power supply, and I/O modules for distributed industrial automation applications.
The chassis provides reliable backplane communication and flexible module allocation for medium to large-scale control systems. Its rear panel mounting configuration simplifies cabinet integration while maintaining grounding continuity and stable module retention.
Key Features
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Supports up to 16 installed modules
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Compatible with Allen-Bradley PLC-5 systems
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Designed for universal 1771 I/O module integration
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Supports half-slot addressing configuration
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Heavy-duty industrial backplane construction
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Processor installation supported in leftmost slot
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Compatible with multiple external and internal power supply configurations
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Rear panel mounting arrangement for control cabinets
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Grounding support for improved electrical stability
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Designed for industrial process and machine automation systems
Technical Specifications
| Specification | Details |
|---|---|
| Brand | Allen-Bradley |
| Model | 1771-A4B |
| Product Type | Universal I/O Chassis |
| Product Series | PLC-5 / 1771 Series |
| Number of Slots | 16 Slots |
| Backplane Type | Universal PLC Rack |
| Current Rating | 24 A |
| Backplane Voltage | 5.25 VDC |
| Addressing Capability | 1/2-Slot Addressing |
| Maximum Assigned I/O Racks | 4 Racks |
| Mounting Method | Rear Panel Mount |
| Grounding Support | Yes |
| Compatible Processor Power Ratings | 2–4 A Integral Power Supplies |
| Compatible Power Supply Modules | 3–8 A Modules |
| Compatible External Power Supplies | 6.5–16 A Units |
| Processor Installation Position | Leftmost Slot Only |
| I/O Adapter Module Position | Leftmost Slot Supported |
| Communication Module Positions | All Slots Except Leftmost |
| I/O Module Positions | All Slots Except Leftmost |
| Power Supply Module Positions | All Slots Except Leftmost |
| Required Keying Bands | 36 Plastic Bands |
| Weight | 13.36 lbs |
Installation Information
The 1771-A4B chassis requires proper mechanical fastening hardware during installation, including cup washers, star washers, flat washers, and captive lock nuts. Correct keying band configuration is recommended to prevent incorrect module insertion.
The chassis is intended for grounded industrial enclosures and should be installed according to Allen-Bradley PLC-5 system guidelines.
Typical Applications
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Factory automation systems
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PLC-5 migration and expansion projects
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Material handling systems
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Industrial process control
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Packaging machinery
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Automotive manufacturing lines
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Water and wastewater control systems
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Distributed I/O architectures
Compatibility
The Allen-Bradley 1771-A4B is compatible with:
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PLC-5 processors
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1771 analog I/O modules
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1771 discrete input and output modules
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1771 communication modules
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1771 power supply modules
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Remote I/O adapter modules
FAQ
Which slot is reserved for the processor module?
The leftmost slot is designated for processor or I/O adapter module installation.
Can communication modules be installed in any slot?
Communication modules may be installed in all chassis positions except the leftmost slot.
Does the chassis support grounding?
Yes. The chassis includes grounding support for industrial control cabinet installations.
What addressing mode does the chassis support?
The chassis supports 1/2-slot addressing with a maximum assignment of four I/O racks.
Is the power supply integrated into the chassis?
No. The chassis requires compatible external or modular power supply units depending on system configuration.
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
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