IEC 61131-3

IEC 61131-3 is the third part (of 10) of the international standard IEC 61131 for programmable logic controllers. It was first published in December 1993 by the IEC; the current (third) edition was published in February 2013.

Part 3 of IEC 61131 deals with basic software architecture and programming languages of the control program within PLC. It defines three graphical and two textual programming language standards:

Ladder diagram (LD), graphical
Function block diagram (FBD), graphical
Structured text (ST), textual
Instruction list (IL), textual (deprecated in 3rd edition of the standard)
Sequential function chart (SFC), has elements to organize programs for sequential and parallel control processing, graphical.

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