工控用，自己编写的调用nodave接口，通过网络连接西门子PLC，并可以读取指定的DB块的DBB区域数据内容，并可以控制PLC停止或运行-Industrial use, write your own call nodave interfaces, connected by a network of Siemens PLC, and can read the contents of the DB DBB area designated, and can control the PLC to sto