Product Details
Overview
The Allen-Bradley 1771-A3B1 is a universal I/O chassis engineered for industrial automation and control systems. With support for up to 12 I/O modules, this chassis offers a scalable and reliable foundation for PLC-5 and distributed control networks. Its open-style, panel-mounted design simplifies wiring access and integration in control panels.
Key Features
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Module Capacity: Accommodates 12 I/O modules for flexible configuration
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Mounting Type: Designed for panel-mount installations
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Electrical Rating: Maximum backplane current of 24 A at 5 V DC
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Durability: Withstands operating shock of 15 g and non-operating shock of 30 g
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Vibration Resistance: Rated at 2 g for frequencies between 10–500 Hz
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Open Chassis Design: Facilitates easy module installation and maintenance
Technical Specifications
Manufacturer: Rockwell Automation
Brand: Allen-Bradley
Part Number: 1771-A3B1
Module Type: Universal I/O Chassis
Number of I/O Slots: 12
Mount Type: Panel Mount
Enclosure Type: Open Style
Electrical & Environmental
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Maximum Backplane Current: 24 A @ 5 V DC
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Operating Temperature: 0–60°C (32–140°F)
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Relative Humidity: 5–95%, non-condensing
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Vibration: 2 g (10–500 Hz)
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Operating Shock: 15 g
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Non-Operating Shock: 30 g
Physical Dimensions & Weight
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Dimensions: 483 × 339 × 221 mm (19 × 12.4 × 7.6 in)
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Weight: 5.9 kg (13 lbs)
Applications
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PLC-5 series and distributed control systems
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Large-scale industrial automation requiring multiple I/O modules
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Manufacturing process control
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Human-Machine Interface Design: Essential Guide to HMI Selection, Visualization, and Control System Integration
Human-Machine Interfaces (HMIs) serve as the primary operational window into complex industrial automation systems. Modern HMIs convert raw machine data into clear graphical displays, enabling operators to oversee entire manufacturing processes in real time. Instead of relying on physical control panels full of hardwired switches, engineers program interactive screens using intuitive graphics, dynamic color coding, and responsive touch interfaces. Over my 15 years in control systems engineering, I have observed HMIs transform from basic display screens into sophisticated command centers that drive operational efficiency across DCS and PLC environments.
Understanding Safety Relays in Industrial Automation: Architecture, Operation, and Functional Safety
Standard electromechanical relays provide basic electrical isolation between low-voltage control circuits and high-power output loads. A traditional switching relay features a magnetic coil driving mechanical Common (COM), Normally-Open (NO), and Normally-Closed (NC) contacts. However, standard relays pose severe functional risks when deployed in critical safety interlock circuits. High current inrush or mechanical wear can weld contacts together permanently. If contact welding occurs in an emergency stop circuit, pressing the button fails to halt hazardous machinery movements. Consequently, global functional safety standards prohibit standard relays for critical machine guarding functions.
Mastering Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.