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Data transfer rate is the amount of data that can be transferred at a time. Network Control System (NCS) based communication system Industrial Ethernet (IE) is becoming very popular for automation system. The Fast Ethernet system with data rate transfer 100Mb/s is used in this project. Star topology with the hub connected to a computer and two Programmable Logic Controller (PLC) are analysis for the data transfer rate performance. Realtime communication for the system is very good without no disconnected between the computer and PLCs. Data transfer rate, packets speed (#/s), packets volume, sum volume (KByte), Central Processing Unit (CPU) usage in percentage, percentage available Read Access Memory (RAM), available memory RAM(MByte) are analysed. It is shown that the data flow for traffic out (speed) is greater than traffic in (speed) for the data transfer rate between the computer and PLCs.