Between VB and PLC communication with the source code, you can refer to, you can rewrite, rather ugly, but the functionality realized, can be rewritten using C#, welcome to download

VB 与 PLC（松下）Communication\VB And PLC Communication\db1.mdb
..............................\........................\FunctionAndSub.bas
..............................\........................\Main.frm
..............................\........................\Main.frx
..............................\........................\MSSCCPRJ.SCC
..............................\........................\Show.frm
..............................\........................\Show.frx
..............................\........................\Variable.bas
..............................\........................\VB And Nais.mdb
..............................\........................\VB And PLC Communication.dwg
..............................\........................\VB And PLC Communication.exe
..............................\........................\VB And PLC Communication.vbp
..............................\........................\VB And PLC Communication.vbw
..............................\VB And PLC Communication
VB 与 PLC（松下）Communication

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