Allen-Bradley 1756-IF8H Hart Analog Input Module

Allen-Bradley 1756-IF8H is a ControlLogix eight-channel HART analog input module that brings Highway Addressable Remote Transducer data into the PLC backplane. It provides eight differential analog input points for reading current or voltage signals and includes integrated HART communication to interrogate field transmitters without external converters. The module uses a 36-pin interface to connect to the ControlLogix backplane and is documented by Rockwell Automation with firmware version 3.012. Typical applications include monitoring HART-enabled process instruments such as flow, pressure, and level transmitters, where measurements are consumed by the ControlLogix controller and accessible via CIP messaging for device diagnostics. The 1756-IF8H supports real-time sampling and built-in diagnostics, including over-range/under-range detection and wire-off status, and is part of the 1756 I/O family designed for tight integration with Rockwell's control systems.