EPA system applies a lot of mature IT technologies to the industrial control system. In the EPA system, according to the communication relationship, the control field can be divided into several control areas. The EPA bridge divides the control areas and limits the communication flow in the local area, transmits the passages between different control areas. Every EPA devices sends data to the networks according to the configured time-sharing principles, so avoid collision and guarantee the determinacy and real time of the communication between the EPA devices.
The he EPA standard has been published publicly by the IEC as the 14th real time Ethernet protocols. By now, this is the first standard accepted by the world in the Chinese industrial automation region.