参考资料如下:
涉及到的软件:TIA V15,PLCSIM, NETTOPLCSIM
https://www.cnblogs.com/xiketang/p/12750806.html
http://blog.sina.com.cn/s/blog_556b9e3c0102z4jw.html
https://www.cnblogs.com/frogkiller/p/12346066.html
https://blog.csdn.net/chengjl8/article/details/106709566/
软件:
http://nettoplcsim.sourceforge.net/