The Mitsubishi Q81BD-J71GP21-SX is an Ethernet/IP communication module designed for use with MELSEC Q Series PLCs. This module enables communication between the MELSEC PLC and other devices over the Ethernet/IP network, allowing for fast, reliable, and flexible data exchange in industrial automation systems. It is ideal for integrating a variety of equipment and systems, such as remote I/O devices, HMIs, SCADA systems, and other automation devices, into the PLC control environment.