... applies. IEC 611 31- 1: 1992, Programmable controllers – Part 1: General information IEC 611 31- 2:2003, Programmable controllers – Part 2: Equipment requirements and tests IEC 611 31- 3:2003, Programmable controllers ... 1. 4.3 of IEC 611 31- 3), or can beexpressed algorithmically in one of the textual or graphic languages in IEC 611 31- 3, i.e. IL(3.2 of IEC 611 31- 3), ST (3.3 of IEC 611 31- 3), LD (4.2 of IEC 611 31- 3), ... ``,`,`,,,``````,,``,,``,,,,`,-`-`,,`,,`,`,,` TR 611 31- 8 IEC: 2003(E) – 13 –A major goal of IEC 611 31- 3 was to remove such barriers to the understanding and applicationof programmable controllers. Thus, IEC 611 31- 3 introduced...