Allen Bradley 1791D-16B0X CompactBlock I/O DeviceNet Discrete Input Module

2026-04-28T00:20:06-07:00

Type: Discrete Input Module
Price: 66.00

Product Overview

The Allen Bradley 1791D-16B0X belongs to the CompactBlock I/O series, providing a high-density, space-saving solution for distributed control via DeviceNet. This discrete input module features 16 sinking-type input points designed to interface with 24V DC field devices like limit switches, proximity sensors, and pushbuttons. By placing I/O closer to the field devices, this module reduces wiring costs and simplifies troubleshooting in complex automation cells. We supply this unit in 100% Brand New and Original condition to ensure your network maintains peak communication integrity and logic accuracy.

Technical Specifications

The 1791D-16B0X utilizes high-speed circuitry to process digital signals across the following parameters:

Feature | Specification
Manufacturer | Allen Bradley (Rockwell Automation)
Inputs per Block | 16 Points
Input Type | Sinking (24V DC Nominal)
Voltage Range | 10–30V DC
On-state Voltage | 10V DC Min
Off-state Voltage | 5V DC Max
On-state Current | 11.0mA @ 30V Max; 2.0mA @ 10V Min
I/O Exchange Modes | Poll, Cyclic, Change of State (CoS)
Protection Rating | IEC IP20
Communication Rate | 125Kbps, 250Kbps, 500Kbps (Auto-detect)
Weight | 0.56 lbs (0.26 kg)

Engineering Advantages

The 1791D-16B0X addresses critical integration challenges in distributed DeviceNet architectures:

High-Density Compact Footprint: The CompactBlock design integrates 16 channels into a small form factor, allowing for installation in shallow enclosures or directly on machine frames where cabinet space is at a premium.

Optimized Data Efficiency: This module supports "Change of State" (CoS) data exchange. Instead of constantly polling every point, the module only updates the controller when an input actually changes. This technical feature reduces network traffic and frees up bandwidth for other critical DeviceNet traffic.

Comprehensive Visual Diagnostics: Three distinct LED tiers provide instant hardware status. The Mod/Net LEDs monitor network health, the Logic LED tracks internal module status, and individual yellow I/O LEDs pinpoint exactly which field device is active, drastically reducing downtime during fault tracing.

Versatile Media Support: The hardware supports both Thick and Flat DeviceNet media. It maintains reliable communication at distances up to 500 meters (at 125Kbps), providing engineers with maximum flexibility for large-scale plant floor layouts.

Robust Input Filtering: The circuitry handles a wide input range (10-30V DC) and features precise off-state current thresholds (1.5mA). This prevents "ghost" signals caused by leakage current from long cable runs or high-impedance sensors.

FAQs

How do I set the DeviceNet Node Address for the 1791D-16B0X?

You set the node address (MAC ID) and communication rate via the hardware switches located on the module or through software commissioning tools like RSNetWorx for DeviceNet.

What is the difference between Sinking and Sourcing inputs?

The 1791D-16B0X is a sinking module, meaning the input point "sinks" current from the field device to the common. You must pair this module with sourcing (PNP) sensors or dry contact switches connected to the positive supply.

Does this module support analog signals?

No. The 1791D-16B0X is strictly a discrete (digital) input module. It only processes ON/OFF signals. For analog requirements, you must select a specific 1791D analog block.

How can I be sure the product is Brand New?

We guarantee the 1791D-16B0X is 100% Brand New. Every unit ships in its original Allen Bradley factory-sealed box, complete with the authentic UPC (612598185733) and manufacturer-applied quality control labels.