做接口程序必备的模拟器，可以模拟PLC的各种状态，本人做接口多年，一直使用这个仿真模拟-Interface program to do the necessary simulator can simulate various states of PLC, I do interfaces for many years, has been using the simulation

西门子s7200仿真专用软件，没有plc的朋友，可以用用 -Siemens s7200 simulation-specific software, no plc friend, can be used with