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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. It defines three graphical and two textual programming language standards:
Only available for the input / output/ in-out variables of system-defined Program Organization Units (POUs, see below)
Variable attributes: RETAIN, CONSTANT, AT
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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. It defines three graphical and two textual programming language standards:
Only available for the input / output/ in-out variables of system-defined Program Organization Units (POUs, see below)
Variable attributes: RETAIN, CONSTANT, AT