Butler Automatic Inc. DC23941 Printed Circuit Board

The Butler Automatic DC23941-503 Master I/O Board is a replacement printed circuit board (PCB) for Butler Automatic automation systems, serving as the master I/O interface within the controller’s hardware family. Identified by part number DC23941-503, it is widely described in repair catalogs and seller listings as the Butler Master I/O Board or Master I/O Board PLC control board. As a PCB module, it functions as the central component that coordinates input and output operations across Butler's control architecture, enabling communication between field devices and the PLC. The model is consistently referenced across independent vendors’ inventories as a genuine Butler Automatic replacement part for its control installations.