Industrial controller and human-machine interface bidirectional data transmission system and method

The invention discloses an industrial controller and human-machine interface bidirectional data transmission system which comprises an industrial controller end Ethernet transceiving unit, a human-machine interface end Ethernet transceiving unit and an Ethernet line, wherein a first Ethernet transceiving module of the industrial controller end Ethernet transceiving unit is connected with the Ethernet line and a first classification data interface; the first classification data interface is connected to the industrial controller through a bus; a second classification data interface of the human-machine interface end Ethernet transceiving unit is connected with the Ethernet line and a second classification data interface; and the second classification data interface is connected to the input/output peripheral equipment of the human-machine interface through a bus. The invention also discloses a bidirectional data transmission method using the industrial controller and human-machine interface bidirectional data transmission system. The system and method disclosed by the invention can prolong the data transmission distance between an industrial controller and a human-machine interface, improve the anti-jamming capability and reduce the cost, have the advantages of few wires, high real-time property and the like, and are easy and flexible to use.