Allen-Bradley 1771-NIS PLC-5 High Resolution Isolated Analog Input Module

Allen-Bradley 1771-NIS PLC-5 High Resolution Isolated Analog Input Module is an 8-channel analog input card for PLC-5 controllers that accepts 4-20 mA current-loop signals and delivers high-resolution measurements to the PLC-5 I/O bus. Each channel is galvanically isolated from the backplane to protect the controller from field-wiring transients, and the module is designed for installation in a PLC-5 I/O chassis and powered from the backplane. The 1771-NIS provides 12-bit per-channel conversion with support for natural binary or BCD data formats, and typical update time is about 25 milliseconds for eight channels. This module is part of the PLC-5 N-series high-resolution analog input family, commonly used in process monitoring and control where accurate current-loop sensing and isolation are required.