本软件采用VB开发，用于上位机和S7-200系列PLC PPI协议通讯

基于西门子S7-200PLC的保压系统源代码，采集、自动控制、界面、打印等功能，是了解除工控软件外，用VB设计工控软件的好实例。-Based on Siemens S7-200PLC pressure maintaining system source code, data acquisition, automatic control, interface, print and other functions, is lifting the industrial control software

LIBNODAVE -- Exchange data with Siemens PLCs-sing MPI,PPI adapters or Ethernet with CPx43 or Ethernet over IBH/MHJ-Netlink or Deltalogic s NetLink PRO If you use GE Fanuc PLCs you might also be interested in LibOpenSRTP by same Author. Don