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The 1771-A4B is a 16-slot universal I/O chassis for the 1771 I/O platform, used to install 1771 I/O modules, processors, communication cards, and various digital and analog cards. Designed for panel mounting, its integrated backplane distributes internal power and transfers data between installed modules.
Utilizes standard back-panel wall mounting
Features 16 standard slots available for 1771 series I/O modules
Available in standalone chassis versions both with integrated power supplies or without power systems
The chassis is compatible with PLC-5, PLC-3, and other controller systems utilizing the 1771 architecture, and matches 1771 series power supplies. It is equipped with card guides, module locking mechanisms, configurable backplane DIP switches, and grounding terminals to facilitate module replacement or adjustment of I/O card configurations.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Allen Bradley 1771-A4B Universal I/O Chassis Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Automotive Manufacturing
Housing high-density digital I/O for large stamping shops and welding robot assembly lines.
Oil and Gas Refining
Accommodating analog input/output modules for crude oil pipeline custody transfer stations.
Water and Wastewater Treatment
Serving as the core control chassis for centralized treatment processes and multi-pump interlocking in the control room.
Thermal and Hydroelectric Power Plants
Used in boiler makeup water, ash removal auxiliary systems, or turbine monitoring, housing high-reliability control modules against heavy EMI environments.
Rubber and Tire Curing/Molding
Acts as a master or remote subsystem chassis, installing dense I/O cards to uniformly collect pressure, mold-clamping stroke, and steam valve controls for curing presses.
Power and Energy
Integrates high-speed counter modules and analog output cards to uniformly regulate synchronized multi-axis drives and tension in paper machine sections.
When using 1771-A4B, notice the backplane current consumption and correct physical slot configurations. The key involves ensuring total module current stays within the 16A backplane limit and properly inserting keying bands to prevent module damage from misplacement. Also, correctly set the rear chassis DIP switches for addressing modes and ensure solid backplane grounding during long-distance communication.
As part of the Allen-Bradley 1771 Universal I/O family, the 1771-A4B is widely used in factory automation, process control, power generation, water treatment, chemical processing, material handling, manufacturing production lines, and OEM equipment. It provides the physical foundation for modular automation systems where multiple I/O modules, communication interfaces, and controller components must operate together within a single industrial control platform.
It is a 16-slot universal I/O chassis for the Allen-Bradley PLC-5 series.
How to use the 1771-A4B?
Install it in a cabinet, insert a power supply, processor, or adapter, and plug in 1771 I/O modules.
How many module slots does the 1771-A4B have?
It has a total of 16 physical slots for installing I/O modules.
Which PLC series is the 1771-A4B compatible with?
It is specifically compatible with the classic legacy Allen-Bradley PLC-5 hardware platform.
Do you offer global delivery services?
Yes. We ship globally, and we are able to quickly deliver parts globally to any corner of the world. Unless otherwise specified, we will ship your order via (DHL). We can also ship through FedEx, UPS, and TNT. We can also use your account.
How do I submit a part enquiry?
Our Product Pages – Simply search for the part number you require in our search bar, and it will take you straight to the product page. You can then email or call us – Speak directly to a dedicated Account Manager, who will be able to answer any questions you have and provide you with a quotation within minutes.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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