100BASE-TX is an Ethernet standard that supports 100 Mbps speeds over twisted-pair cabling. Defined by the IEEE 802.3u standard, it uses Cat 5 or higher cables and operates in full-duplex or half-duplex mode. It is a baseband technology, meaning it transmits data without modulation. IEEE 802.3u is widely used in industrial automation to connect HMI, PLC, and network switches for faster data exchange. This standard improves reliability and efficiency compared to older 10BASE-T networks.
Example Scenario – HMI and PLC communicating through a Switch:
An HMI and PLC communicate using 100BASE-TX through a switch. The HMI sends operational data to the PLC, which processes commands and controls machinery. Using Cat 5e cables, the devices exchange data at 100 Mbps, ensuring faster updates and real-time monitoring.
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