Confirm the complete 1771A4B part number and series from the product label.

Allen-Bradley 1771A4B I/O Chassis - Modular Control System
- Part number
- 1771A4B
- Availability
- In stock
- Category
- PLC & I/O Systems
- Subcategory
- PLC Racks, Bases & Backplanes
1771A4B product information
Allen-Bradley 1771A4B I/O Chassis – Modular Control System
Highly reliable modular I/O chassis for industrial control systems
| Brand | Allen-Bradley |
| Model | 1771A4B |
| Voltage | Not specified |
| Country of Origin | United States |
| Weight | 15 kg |
| Dimensions | 483 x 133 x 305 mm |
| Warranty | 1 year |
| Certifications | UL, CE |
| SKU / MPN | 1771A4B |
| What’s in the box | I/O Chassis, mounting hardware, documentation |
| Number of Slots | 16 |
| Power Consumption | 120W |
| Operating Temperature | 0 to 60°C |
| Humidity Range | 5 to 95% RH non-condensing |
| Communication Protocol | DH+ |
| Mounting Type | Panel Mount |
Key benefits: Flexible configuration, high reliability, easy maintenance
Typical applications: Manufacturing automation, process control, machine control
Order number: Allen-Bradley 1771A4B I/O Chassis – Modular Control System
Lifecycle: Active
Documentation: User manual, installation guide, technical specifications
Confirm the complete system—not only the model number
Industrial components can differ by series, firmware, voltage, network, terminal base, memory, accessories and approvals. A matching front label does not by itself guarantee a drop-in replacement.
Send the existing system or application information when compatibility matters.
State quantity, preferred condition, destination and required delivery date.
Include a clear nameplate photo when the revision is uncertain.
Know what is being quoted
The offered condition and inspection scope should be written into the quotation. Do not assume every source uses condition terms in the same way.
New product
Ask whether the unit is factory sealed, open-box or unused surplus, and confirm packaging when relevant.
Unused surplus
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Refurbished product
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Used product
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Technical references
Manufacturer documentation should be used for engineering, installation, safety and certification decisions. This page supports identification and sourcing; it does not replace the manufacturer manual.
Common product questions
Find answers about product identification, compatibility, condition options and quotation requirements.
How can I identify the correct product?
Check the complete part number, series, revision and product label before requesting a quotation.
How should compatibility be confirmed?
Compare the electrical specifications, communication requirements, accessories and existing system documentation.
Which condition options are available?
Products may be offered as new, surplus, refurbished or used. The quotation will state the supplied condition.
What information is needed for a quotation?
Provide the part number, quantity, preferred condition, destination and required delivery date.
Send the part number and receive a clear quotation.
Include quantity, acceptable condition, destination and timing. A label photo helps verify the request.

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