Allen-Bradley 1756-IF6I 6-Point Analog Isolated Input Module

The Allen-Bradley 1756-IF6I is a six‑channel isolated analog input module for ControlLogix systems that accepts both voltage and current signals from sensors while maintaining galvanic isolation between each input and the controller backplane. It places six isolated input channels on a 20‑pin signal block and supports removable terminal blocks 1756‑TBNH or 1756‑TBSH (also compatible with 1756‑TBCH or 1756‑TBS6H) for field wiring, enabling flexible installation in diverse automation layouts. Key specifications include 250 V continuous isolation (channel‑to‑backplane and channel‑to‑channel), routine isolation tested up to 1350 V AC for safety, and backplane current requirements of up to 250 mA at 5 V or up to 100 mA at 24 V, with typical module power dissipation in the 3.7–4.3 W range depending on input configuration; the per‑point isolation feature further enhances noise immunity by isolating each channel. The module is part of the ControlLogix I/O family and is used to interface sensors such as 4–20 mA loops and standard voltage sensors, providing a robust, isolated analog input interface for precise process measurement and control in industrial environments.