1756-IF16H Allen Bradley ControlLogix 16 Pt A/I HART Module

The Allen-Bradley 1756-IF16H is an analog input module from the 1756 ControlLogix Programmable Logic Controller Automation (PAC). It supports integration of 0-20 mA or 4-20 mA input signal through hardwiring and Highway Addressable Remote Transducer (HART) communication protocol. This module provides Sixteen (16) differential current signals and One (1) HART modem per channel.

The 1756-IF16H has an integrated Analog to Digital Converter (ADC) using successive approximation method. Analog conversion resolution range is 16-21 bits, allowing more measuring points to be displayed. Converted signal is saved in Integer mode (left justified, 2 s complement) IEEE 32-bit floating point number.

Allen-Bradley recommends use of Single wire connection when terminating signals to the 1756-IF16H. Wire diameter is 0.33…2.1 mm2 (22…14 AWG) solid or stranded shielded copper wire with insulation rating of 105 °C (221 °F) or higher and maximum insulation thickness of 1.2 mm (3/64 in.). Compatible Removable Terminal Block (RTB) for use with the 1756-IF16H are 1756-TBCH and 1756-TBS6H.

The 1756-IF16H has a calibrated accuracy which is better than 0.13% of range on all filters while the module error is 0.3% of range. The module’s input scan time is 11…328 ms that is filter dependent while the module HART scan time is estimated at 1 s if all channels are HART enabled.