This paper analyzed and compared different ways and methods for centralized control station cutting in dispatching automation system from both sides: optical communication and dispatching automation systems,also introduced the working principle of Ethernet and important role of Ethernet board.

This paper introduced two design schemes for substation on-line network by taking optic fiber communication system as channel and using Ethernet board and protocol converter,also showed respectively the merits and demerits of two design schemes.

How to solve above problems based on ACR EMD GE interface board are discussed.

The Long Distance Monitor and Control System of Injection Machine Basing on the Ethernet;

Study of welding machine connects to Ethernet based on embedded gateway;

Application of Industrial Ethernet and Profibus DP to Alloy Steel Casting Machine;

After researching of the system architecture of integration the enterprise message network with the field bus and the integration technology of the Ethernet and field bus,this paper mentions several interconnecting strategies between the field bus networks and Ethemet,thereby it shows the possibility of the interconnection between the field bus networks via Ethern.

Through the transplant of uCosll,the translation between CAN protocol and Ethemet protocol has been successfully fulfilled.