Communication and networking modules connect controllers, I/O stations, supervisory systems, drives, and field devices across industrial networks. Their architecture typically combines one or more physical network ports, protocol-processing electronics, configuration memory, diagnostics, and an interface to the host controller or backplane. The category includes Ethernet modules, fieldbus interfaces, protocol gateways, network adapters, and communication processors for EtherNet/IP, PROFINET, PROFIBUS, Modbus, ControlNet, and DeviceNet. Technical characteristics include supported protocol roles, network speed, port type, connection capacity, data mapping, redundancy, and controller compatibility. Functionally, these modules exchange process data, translate protocols, link distributed equipment, and provide diagnostic communication between automation layers. Selection should match the required protocols, physical interface, controller family, network topology, and installed system generation.
