ETHERNET BASED INDUSTRIAL COMMUNICATION SYSTEM FOR USING DUAL BUFFER

摘要

An ethernet-based industrial communication system using a dual buffer is provided to solve a problem that there occurs a transmission delay because of a buffering delay of control data, leading to malfunction of a control system, according as the existing Ethernet buffer processes long monitoring data which arrives relatively first. An input filter(110) receives monitoring data and control data, discriminates type of the inputted data, generates the first switching signal, outputs the monitoring data through the first output terminal according to the first switching signal, and outputs the control data through the second output terminal. A dual buffer(120) temporarily stores the monitoring data in the first buffer, temporarily stores the control data in the second buffer, and outputs the monitoring data and the control data. A buffer switch(130) preferentially outputs the control data which is outputted through the second buffer of the dual buffer(120). A switch controller(140) receives the first switching signal and outputs the second switching signal to the buffer switch(130) so that the control data can be preferentially outputted from the buffer switch(130).