Allen-Bradley 1756-IA16 ControlLogix Discrete AC Input Module

Description

The Allen-Bradley 1756-IA16 is a high-performance ControlLogix discrete AC input module designed for industrial automation and control environments. Engineered to interface seamlessly with 120V AC switches, auxiliary contacts, and other discrete signaling devices, this module provides reliable signal conversion for complex automation architectures.

Operating as an integral component of the Rockwell Automation ControlLogix platform, the 1756-IA16 utilizes advanced Producer-Consumer technology. This capability enables input data and diagnostic information to be efficiently shared across multiple controllers over the backplane or network infrastructure, minimizing redundant wiring and maximizing system responsiveness.

Features

• 16 discrete AC input channels grouped in 8 points per group for flexible wiring configurations
• 120V AC nominal voltage category with an operating voltage range of 74 to 132V AC (47 to 63Hz)
• Individual front-panel channel status LEDs for immediate visual verification of active and inactive inputs
• User-selectable input filter times (1ms or 2ms for OFF to ON; 9ms or 18ms for ON to OFF) to suppress electrical noise
• Robust Producer-Consumer architecture for high-speed, multi-controller data sharing across the ControlLogix backplane
• Standard modular design that mounts directly into any ControlLogix chassis slot

Applications

• Monitoring status signals from limit switches, pushbuttons, and selector switches in automated manufacturing lines
• Interfacing auxiliary contacts from motor starters, contactors, and control relays
• Discrete signal acquisition in packaging machinery, material handling systems, and assembly cells
• Plant floor automation requiring reliable AC voltage sensing and noise immunity

Technical Specifications

Connections / Interfaces

Field-side wiring connects to the 1756-IA16 module via a separately ordered Removable Terminal Block (RTB) that plugs directly into the front of the unit. Compatible terminal blocks include the 20-position 1756-TBNH NEMA screw-clamp block or the 1756-TBSH spring-clamp terminal block. For extended wiring requirements, compatible interface modules (IFMs) and pre-wired cables can be utilized to streamline cabinet installation.

Installation Guidelines

The 1756-IA16 module mounts into any available slot within a standard Allen-Bradley ControlLogix chassis. Ensure power is removed from the chassis backplane and field wiring before installing or removing the module. Secure the module firmly using the top and bottom latching mechanisms. Verify that the correct RTB is selected and wired in accordance with local electrical codes and the manufacturer's installation drawings.