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: Ladder diagram (LD), graphical Function block diagram (FBD), graphical Structured text (ST), textual Instruction list (IL), textual Sequential function chart (SFC), has elements to organize programs for sequential and parallel control processing . Continuous Function Chart (CFC). This language is an extension to the IEC 61131-3 standard, which gives free positioning of graphic elements. Notes: https://drive.google.com/file/d/0B-ZhnHb2X39pX1Y0WHJEMTdIWTQ/view?usp=sharing
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