Negative Input Converter and Schmitt Trigger

This document describes the W501, a W series module containing a Schmitt trigger circuit designed to provide standard voltage level outputs from external activities like switch or relay closures. It details the module's capability to filter contact bounce, adjust switching thresholds, and support various input configurations including direct and integrating inputs. Key specifications such as input impedance and threshold ranges are provided, along with schematic diagrams for NANDed and integrated input applications.