The Allen-Bradley 1771-IAD D 120V Digital AC/DC Input Module is a PLC processor module designed for industrial automation and motion control systems. This module, with a unit quantity of 1, is specifically manufactured by Allen-Bradley, a well-known brand in the field of PLCs and HMIs. It is capable of handling both AC and DC input signals, making it a versatile component for various industrial control applications. With its reliable performance and compact design, this module is an essential part of many automation systems in businesses and industries.