this is my online search for a long time to find the PLC and PC communications related papers, hope you like them.

微机与plc通信
.............\PLC与上位计算机的串行通信程序设计.pdf
.............\VC6.O平台下的一种计算机与PLC的简易通讯实现方法.pdf
.............\基于VC++和MFC的上位机与PLC的通讯系统.pdf
.............\基于VC++的PLC与上位机的通讯.pdf
.............\用VC++6.0实现PLC与PC机之间的通信.pdf
.............\用VC++6.0实现PLC与PC机之间的通信2.pdf

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