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Siemens S7-1500 Series defined open Ethernet communication is not only open IE communication, mainly TCP, ISO-ON-TCP, UDP three kinds of communication methods, they have the following characteristics.
Features of TCP Communication protocol
Connection-oriented communication protocols
Establish a connection with three handshakes
Reliability of transmission using "with retransmission confirmation" technology
TCP transmission takes the form of data flow, sending and receiving length requirements are consistent
Addressing with port numbers Suitable for transmission waiting for a large amount of data