Common
IEC 61131-3
Industrial standard for programmable logic controllers
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 (fourth) edition was published in May 2025. Part 3 of IEC 61131 deals with basic software architecture and programming languages of the control program within PLC. The current edition defines three graphical and one textual programming language standards: Ladder diagram (LD), graphical Function block diagram (FBD), graphical Structured text (ST), textual Sequential function chart (SFC), has elements to organize programs for sequential and parallel control processing, graphical. Previous editions also included: Instruction list (IL), textual. Deprecated in the third edition (2013) and removed in the fourth edition (2025).
Open boosters, collect cards and trade them. Free to play.
Play for free