1, by the DLL to communicate with the PLC, based on the ppi agreements. DLL file name: S7_200_PPI.dll 3, serial cable for Siemens PC-PPI cable or welding 4, S7-200 PLC default parameter to 5, the default up to read 100 VB bytes or 50 VW word, by modifying the relevant parameters, you can read more 6 V region of operation, in order to simplify procedures, only in the practical application of sufficient 7 operating VW words, the address should be an even number

ppi协议VB代码\vb\Form1.frm
.............\..\Form1.frx
.............\..\S7_200_PPI.bas
.............\..\S7_200_PPI.dll
.............\..\工程1.exe
.............\..\工程1.vbp
.............\..\工程1.vbw
.............\说明.txt
.............\vb
ppi协议VB代码

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