Product Details
Product Overview
The Allen-Bradley 1791D-16B0 functions as a high-density, distributed I/O solution for DeviceNet industrial networks. This CompactBlock I/O base module integrates 16 sinking inputs designed for 24V DC operation into a single, space-saving footprint. While the manufacturer officially discontinued this series in 2013, we provide this specific unit as 100% Brand New original factory stock. It enables seamless data acquisition from sensors and switches in legacy architectures without necessitating a full system migration to Ethernet-based platforms.
Technical Specifications
| Feature | Specification |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Line | CompactBlock I/O (1791D) |
| Network Protocol | DeviceNet |
| Input Count | 16-Point |
| Input Type | Sinking (24V DC) |
| Operating Voltage | 24V DC Nominal |
| Module Style | Base Block / Integrated I/O |
| Weight | 0.40 lbs (0.18 kg) |
| Status Indicators | Network, Module, and I/O status LEDs |
| Category | Distributed Machine Control |
Engineering Advantages
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Optimized Small-Footprint Design: The 1791D-16B0 utilizes an ultra-compact "Block" architecture. This allows engineers to mount the I/O directly onto machine frames or inside small junction boxes, drastically reducing the cost and complexity of long-distance multi-conductor wiring runs back to a central cabinet.
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Integrated DeviceNet Connectivity: This module contains a built-in DeviceNet communication adapter. It eliminates the need for a separate communication interface, allowing the 16 inputs to join the network immediately via a standard 5-pin open-style connector.
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Rapid Fault Diagnosis: High-visibility LEDs on the front panel provide real-time status for the network and every individual input point. This enables maintenance teams to identify failed field sensors or communication drops instantly without connecting a laptop.
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Legacy System Preservation: Using a 100% Brand New 1791D-16B0 ensures the continued operation of existing DeviceNet infrastructures. It maintains the exact physical and electrical parameters of the original installation, preventing the timing or protocol synchronization issues often associated with third-party gateway solutions.
FAQs
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Does this module require a separate power supply for the DeviceNet side?
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Yes. The DeviceNet network typically provides the power for the communication circuitry, while a separate 24V DC source must power the field-side inputs to ensure total electrical isolation.
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Is the 1791D-16B0 compatible with all DeviceNet scanners?
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Absolutely. The 1791D-16B0 adheres to standard DeviceNet profiles. It works seamlessly with Allen-Bradley 1756-DNB, 1747-SDN, and 1769-SDN scanners, as well as third-party DeviceNet masters.
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Can I expand this block with additional I/O?
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The 1791D-16B0 serves as a "Base Block." Depending on the specific configuration of your DeviceNet node, you may be able to connect compatible expansion modules; however, most engineers utilize this 16-point block as a standalone node for maximum signal reliability.
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How do I verify the authenticity of this discontinued part?
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We supply this unit in its Original Factory Packaging with intact serial numbers. As a 100% Brand New item, it shows no signs of terminal wear or mounting mark typical of "refurbished" or "pulled" hardware.
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
Evolving SCADA System Architectures in Industrial Automation
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Choosing the Right Controller: PLC vs. Motion Controller in Industrial Automation
Selecting the optimal control architecture is a foundational decision in industrial automation. Engineers must frequently choose between a Programmable Logic Controller (PLC) and a dedicated Motion Controller. While both systems manage machinery, their underlying design philosophies differ significantly, impacting performance, scalability, and system integration.
Mastering PLC Power Supply Architectures and Operating Voltages
Selecting the correct operating voltage is a critical step in designing reliable industrial automation systems. Whether you are working with a compact PLC or a large-scale DCS, your power architecture dictates the system's longevity. In this guide, we explore the standard voltage ranges and power distribution strategies required to maintain stable factory automation operations.