Boston Digital 11D561-10E303 is a refurbished machine I/O board and PLC control card built around a digital circuit board for Boston Digital automation systems. The module pairs 11D561 with 10E303 (Revision B in common listings) to provide digital input/output interfacing in industrial control configurations. Marketed as a replacement Boston Digital PCB, this board serves as the machine I/O interface within PLC-based control architectures to manage field devices and communicate with the main controller.
