官网链接：https://support.industry.siemens.com/cs/document/109989774/simatic-step-7-incl-safety-s7-plcsim-and-wincc-v21-trial-download?dti=0&lc=en-WW
网盘链接：https://pan.baidu.com/s/1l7S69OWyPZvpfR_8GqKaaw?pwd=TP21#list/path=%2Fsharelink1101113689947-257105975381741%2FTIA%20Portal%20V21&parentPath=%2Fsharelink1101113689947-257105975381741 密码TP21
