About PLCopen . What is PLCopen; Organization; Members; Benefits. Benefits for Users of IEC 61131-3; Evaluation of Software; How to recognize an IEC 61131-3 Programming System in 8 easy steps; Structuring Program Development with IEC 61131-3; Promotion; What is New? Technical Activities . Logic/IEC 61131. IEC 61131-3; Overview (-1 to -8) Motion ...