SFC language
Programming languages for IPA: standard CEI 1131-3

Sequential Function Chart (SFC) is a graphical language used to describe sequential operations. The process is represented as a known sequence of steps, linked by transitions. A Boolean condition is attached to each transition. A set of actions is attached to each step. Conditions and actions are described in other languages (ST, IL or LD). For programs, conditions and actions can be described in three other languages: ST, IL or LD. For function blocks, conditions and actions can be described in two other languages: ST or LD. Conditions and actions can be used to call functions or function blocks written in another language.