IEC 61131-3 Programming FBD

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IEC 61131-3 is the third part (of 8) of the open international standard IEC 61131 for programmable logic controllers, and was first published in December 1993 by the IEC. The current (third) edition was published in February 2013.
IEC 61131 deals with programming languages and defines two graphical and two textual PLC programming language standards:

Notes:

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