The 1756-IF8I is a ControlLogix analog input module. It has eight (8) individually isolated current and voltage input channels compatible with an input signal range of ±10.5V, 0-10.5V, 0-5V, and 0-21 mA. It has a resolution of 24 bits and is compatible with 2- and 4-wire transmitters.
The 1756-IF8H is an analog input module that is part of Allen-Bradley’s Logix controller platform. This module features Eight (8) differential voltage or current input channels and One (1) Highway Addressable Remote Transducer (HART) modem. Each channel is configurable for 0-20 mA and 4-20 mA input signals while configurable voltage input signals are +/-10 VDC; 0-5 VDC; 1-5 VDC and 0-10 VDC. This module has a resolution of 16 - 21bits.
Allen-Bradley 1756-IF16H ControlLogix Current Analog Input Module with HART Protocol, 16 Differential Current Inputs (0-20mA, 4-20 mA); Dedicated HART Modem per Channel