1, through the DLL communicates with PLC, based ppi agreement. 2, DLL file name: S7_200_PPI.dll 3, serial cable for the Siemens PC-PPI cable or own welding 4, S7-200 PLC default parameters to 5, the default read a maximum of 100 bytes or 50 VW VB words, by modifying the DLL function, you can read more 6, in order to simplify procedures, only V zone operations, practical application is sufficient to 7, the operation VW words, the address should be an even

delphi\200PLC位机通信源码\delphi\Project1.cfg
......\..................\......\Project1.dof
......\..................\......\Project1.dpr
......\..................\......\Project1.exe
......\..................\......\Project1.res
......\..................\......\S7_200_PPI.dll
......\..................\......\Unit1.dcu
......\..................\......\Unit1.ddp
......\..................\......\Unit1.dfm
......\..................\......\Unit1.pas
......\..................\......\Unit1.~ddp
......\..................\......\Unit1.~dfm
......\..................\......\Unit1.~pas
......\..................\说明.txt
......\..................\delphi
......\200PLC位机通信源码
delphi

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