Allen-Bradley 1794-IF8IH FLEX I/O HART Analog Module By wayne No Comments on Allen-Bradley 1794-IF8IH FLEX I/O HART Analog Module 3 Min Read The Allen-Bradley 1794-IF8IH is an 8-input HART analog module with isolated inputs. It offers Sigma-Delta conversion for precise unipolar and bipolar signal processing in hazardous locations.