See IEC 61131.
"IEC 61131-3." YourDictionary, n.d. Web. 14 October 2018. <http://www.yourdictionary.com/iec-61131-3>.
IEC 61131-3. (n.d.). Retrieved October 14th, 2018, from http://www.yourdictionary.com/iec-61131-3
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