PLC and Arduino communication using socket programming

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hi
currently working industrial plc supports tcp/ip protocol. using audrino uno , ethernet shield read , write data plc using protocol. not want use modbus achieve this.
is there in forum me on socket programming.

if internet search for arduino ethernet you find plenty of links libraries , example code, e.g.
https://www.arduino.cc/en/reference/ethernet

with arduino can set tcp connection or send udp datagrams
are tcp/ip facilities on plc fixed (e.g. accepts udp datagrams on fixed port) or can program it?


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