The Bailey Controls 6637517A1 Keyboard Interface Module is an MCS keyboard interface board used with Bailey Infi90 control systems. Identified in listings as 6637517A1 and described as a keyboard interface module (WL83), it serves as the dedicated input interface between a front‑end operator keyboard and the Bailey MCS/Infi90 controller. As part of the Bailey Controls/ABB lineage, this module is intended for installations that require a Bailey‑specific keyboard interface within the MCS architecture. Product listings describe 6637517A1 specifically as a Bailey Controls keyboard interface module for MCS systems.
