西门子200自由口通讯，s7-200自由口与流量计，COD，的通讯，PLC程序-Siemens 200 free port communication, s7-200 free port with the meter, COD, communications, PLC program

西门子PLC S7-300 & S7-400系列TCP连接上位机程序，无需PLC端再编程，源码包含C#和VB，亲测S7-300 CPU-314C-2 PN/DP可用。(PLC connected PC via RJ45 directly and do Memory write and read)

C#与西门子PLC通讯的程序, 利用动态库编程。通讯稳定速度快。(C# communication with s7-1200)

这个组件的访问测试项目，您可以进行初步的访问的测试，免去了您写测试程序的麻烦，这个项目是和三菱，西门子PLC的访问写在一起的。(This component's access test project, you can carry out preliminary access test, free you from the trouble of writing test program, this project is written together with Mitsubishi, Siem