1756-IV16 | Allen-Bradley ControlLogix Digital DC Sinking Input Module

2026-04-20T22:51:07-07:00

Type: Digital Input Module
Price: 66.00

Product Overview

The Allen-Bradley 1756-IV16 functions as a high-density digital input interface for the ControlLogix platform. This module provides 16 sinking input points, allowing the controller to sense discrete signals from field devices such as limit switches, proximity sensors, and pushbuttons. It operates within a flexible 10–30V DC range, making it compatible with a wide array of industrial power standards. We provide this module in 100% Brand New condition, ensuring optimal signal detection and long-term chassis stability for your automation architecture.

Technical Specifications

The 1756-IV16 utilizes the following parameters to ensure precise discrete data acquisition:

Parameter | Specification
Number of Inputs | 16 Sinking Inputs
Nominal Input Voltage | 12/24V DC
Operating Voltage Range | 10–30V DC
Input Delay Time | 2 ms + hardware filter time
Peak Power Dissipation | 5.41 Watts @ 60°C
Backplane Current (5V) | 110 mA
Backplane Current (24V) | 2 mA
Off-State Current (Max) | 1.5 mA
Weight | 0.19 lbs (0.09 kg)

Engineering Advantages

The 1756-IV16 streamlines high-speed data collection by addressing specific electrical and mechanical challenges:

Sinking Configuration Logic: The sinking design allows the module to receive current from sourcing field devices (PNP). This standard configuration simplifies wiring in complex panels and matches the majority of modern industrial sensor outputs.

Customizable Signal Filtering: Users can adjust input filter times to eliminate electrical noise and "contact bounce" from mechanical switches. This software-defined filtering ensures the CPU receives clean, debounced signals even in high-EMI environments.

Thermal Management: The module dissipates only 5.41 Watts at peak operation. This low thermal footprint prevents heat buildup within the ControlLogix chassis, protecting adjacent processors and communication modules from heat-induced failure.

Rapid Diagnostic Response: The 2ms hardware delay ensures the controller reacts almost instantly to field changes. This speed proves critical for safety interlocks and high-speed counting applications where millisecond accuracy impacts production quality.

FAQs

Does the 1756-IV16 require a separate Removable Terminal Block (RTB)?

Yes. You must purchase a 1756-TBNH or 1756-TBSH terminal block separately to connect the field wiring to the module. Ensure you seat the RTB fully to maintain a secure electrical connection.

What is the difference between this sinking module and a sourcing module?

The 1756-IV16 is a "Sinking" module, meaning it provides a path to ground (COM) for the current coming from your field device. If your sensors are "Sinking" (NPN), you would typically require a "Sourcing" module instead.

Is this a Brand New original Allen-Bradley part?

Yes. We supply only 100% Brand New units in original factory condition. New modules guarantee that internal optoisolators and circuitry possess their full service life without previous electrical stress.

Can I hot-swap this module while the chassis is powered?

The ControlLogix platform supports Removal and Insertion Under Power (RIUP). While you can replace the module without shutting down the system, always follow plant-specific safety protocols to prevent accidental machine movement during the swap.