Reliance Electric S-67108-3 Pulse Tachometer Input

Reliance Electric S-67108-3 Pulse Tachometer Input is a modular interface that accepts tachometer pulses from motor encoders and feeds speed information into a Reliance Electric DCS/PLC system. In catalog and resale listings it is described as a Pulse Tach Input Module and is commonly identified by the alternate reference 57C421B (S-67108-3) within the Reliance ecosystem. The module is designed to receive differential tachometer signals on the typical A and B channels of a quadrature encoder, providing a reliable input for real-time speed sensing in automated systems. By converting encoder pulses into a numeric input for the DCS controller, it enables accurate feedback for velocity control loops and motor monitoring, supporting consistent performance in automated processes. The S-67108-3 is part of Reliance Electric’s pulse tach input family, intended for integration with Reliance drive and control modules and other compatible DCS components, reflecting its role in industrial applications that rely on precise rotational-speed data.