[1] http://www.siemens.com/about/en/
[2] http://www.amci.com/tutorials/tutorials-what-is-programmable-logic-controller.asp
[3] http://www.esabna.com/us/en/education/blog/what-is-a-gantry-cutting-machine.cfm
[4] http://www.siemens.com.br/upfiles/1124.pdf
[5] http://moodleprod.murdoch.edu.au/mod/book/view.php?id=217273&chapterid=9659
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