............\西门子200PLC上位机通信.经典源码_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