Schneider Electric B371SA Register Input Module

Schneider Electric B371SA Register Input Module is a Modicon B371 series input module for PLC systems. It functions as a register input, converting external digital signals into the PLC's register file so the controller can monitor input conditions and drive logic in automation or process-control applications. The B371SA designation places it within Schneider Electric's Modicon family, with historical cross-reference to Gould B371,SA in legacy installations. Typical uses include interfacing sensors, switches, and other field devices to capture real-time input states as part of a larger control strategy in manufacturing, packaging, material handling, and similar industrial processes. In operation, the module reads inputs and presents them as register data to the PLC, supporting routine I/O mapping and sequential control tasks within a Modicon-based control architecture.