Ring redundant real-time Ethernet communication method

Abstract

The invention discloses a ring redundant real-time Ethernet communication method which is characterized in that chain networks are compatible with each other through a communication terminal node automatic arbitration mechanism, the effect caused by false code transmission is reduced in a manner of transmitting redundant data, the normal operation of two chain network maintenance systems can be automatically formed after intermediate network disconnection or node failure, so that the reliability of the systems is greatly improved. The network at least contains a main node and a plurality of slave nodes; each node is provided with a standard Ethernet network interface A and a standard Ethernet network interface B; a network cable starts from the network interface A of the main node, connects all the slave nodes together in a cascading manner and is finally connected with the network interface B of the main node to form a ring network loop; a ring network is compatible with a chain Ethernet by adopting a terminal slave node automatic arbitration mechanism and realizes self-recovery after network disconnection; and the whole communication process is divided into three stages, i.e. enumeration, configuration and cyclic communication. According to the situation that the network disconnects from the middle part due to failure, the systems automatically and continuously keep the communication with the main node according to the two chain networks, thereby enhancing the reliability and the fault-tolerant ability of the systems.

Description

technical field [0001] The invention relates to a ring redundant real-time Ethernet communication method. Background technique [0002] The industrial Ethernet technology that applies Ethernet to field level communication has become the development direction of industrial control network. However, the particularity of industrial control puts forward higher requirements for the real-time, certainty and reliability of the network system. [0003] Ethernet has a very flexible topology. In the field of industrial control, the chain structure is adopted by many industrial Ethernet manufacturers due to its simple structure and convenient maintenance. However, due to the complex environmental factors in industrial sites, the network system must accept the interference from electromagnetic equipment and the influence of ambient temperature, humidity, and vibration. This may cause the failure of the network system, and a problem with any slave node in the chain network may cause th...

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Problems solved by technology

However, as mentioned above, in view of possible error transmission problems in network communication, the chain network can only adopt a data retransmission mechanism, which will reduce the efficiency of network communication, increase the communication burden of the master node, and require high real-time performance in some In some occasions, it may cause system failure; and if the intermediate connection of the chain network is disconnected or a slave node fails, it will lead to the paralysis of the entire chain network, resulting in serious production accidents

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