EtherCAT, developed by Beckhoff and standardized in IEC 61158, treats the network like a train: the master sends one Ethernet frame, and each slave’s hardware inserts and extracts its bytes as the frame passes, without storing it. Processing happens in the slave controller chip in nanoseconds, so a cycle covering hundreds of axes can complete in a fraction of a millisecond, with distributed clocks keeping all nodes synchronized.
That performance makes it the usual choice for multi-axis motion, robotics, and semiconductor equipment, where jitter matters most. The trade-offs mirror the strengths. Slaves need dedicated EtherCAT silicon, the topology is a logical ring driven by one master, and ordinary IT devices cannot share the segment, so a gateway or a separate port is needed to export data to industrial IoT platforms. PROFINET offers more flexibility at lower speed.
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