... graphic languages in IEC 6113 1-3 , i.e. IL(3.2 of IEC 6113 1-3 ), ST (3.3 of IEC 6113 1-3 ), LD (4.2 of IEC 6113 1-3 ), or FBD (4.3 of IEC 6113 1-3 ).e) The system is then implemented by “bottom-up” functional ... ``,`,`,,,``````,,``,,``,,,,` ,-` -` ,,`,,`,`,,` TR 6113 1-8 IEC: 2003(E) – 13 –A major goal of IEC 6113 1-3 was to remove such barriers to the understanding and application of programmable controllers. Thus, IEC 6113 1-3 ... sequential, the first step in the decomposition may be the formulation of an SFC (2.6 of IEC 6113 1-3 ) expressing the sequence of operations to be performed and the conditions for repeating the cycle of operations....