The ABB TB521-ETH-XC is a rugged Ethernet communication interface module designed for the AC500-XC series of programmable logic controllers (PLCs). As part of the eXtreme Conditions (XC) range, this module is engineered to operate reliably in harsh environments with extended temperature ranges, high humidity, and vibration. It provides robust Ethernet connectivity, enabling seamless integration of the PLC into various network architectures. The module features two switched RJ45 ports and supports multiple protocols, including Modbus TCP and EtherNet/IP, making it a versatile solution for industrial automation, machine control, and data acquisition applications that demand high performance and durability.