1771-A4B
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Replace Industrial is NOT an authorized distributor for Allen-Bradley
Shipping & Delivery
Shipping & Delivery
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Product Conditions
Product Conditions
Surplus: Surplus units show no signs of installation or having been used previously. These units are in the original packaging, which may have been opened.
Used: Used units have been previously used and are inspected, cleaned and tested.
All units come with a 1 Year Replace Industrial Warranty.
Tax & Exemptions
Tax & Exemptions
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Product Conditions
Replace Industrial, LLC is not affiliated with any of the manufacturers listed on this website. All products are sourced & verified through the industrial surplus market and through other independent supply chains. We do not convey any manufacturer warranty with the product. Each product sold comes with a 2 Year Replace Industrial Warranty, unless specified otherwise. This warranty conveys solely through Replace Industrial, LLC. and is completely unaffiliated with any manufacturer warranty. The terms of our warranty can be found here.
Surplus: This unit is sourced through the industrial market outside of the manufacturer and has been independently verified to not have been used operationally previously. These units are in the original packaging, but the packaging & unit may show signs of shelf wear.
Used: This unit may have been previously used and show signs of wear. The unit has been independently verified and is guaranteed with a 1 Year Replace Automation Warranty. The unit has been sourced through independent supply chains in the industrial markets.
Firmware: Replace Industrial, LLC sells hardware only and does not sell firmware and makes no representation as to what firmware may or may not be present on the hardware. We do not obtain or provide software for customers.
Allen-Bradley 1771-A4B
The Allen-Bradley 1771-A4B is a 16-slot I/O chassis assembly designed for use with PLC-5 systems. As part of the 1771 I/O series, this back-panel mounted chassis provides modular flexibility and scalability for industrial control applications. It accommodates various 1771 series I/O modules, communication adapters, and power supplies, allowing users to configure systems tailored to their specific needs. The 1771-A4B supports backplane communication between modules and ensures secure, organized installation in panel-based control enclosures. Known for its robust construction and long-standing reliability, it is ideal for legacy Allen-Bradley PLC installations.
| Manufacturer | Rockwell Automation |
| Brand | Allen-Bradley |
| Part Number | 1771-A4B |
| Product Type | I/O Chassis Assembly |
| Series | PLC‑5 / 1771 |
| Number of Slots | 16 |
| Mounting Type | Back-Panel Mount |
| Compatibility | 1771 Series I/O Modules, PLC‑5 Processors |
| Backplane | 1771 I/O Backplane Communication |
| Status | Discontinued by Manufacturer |
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