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Condition of an SFC transition

Each SFC"Sequential function chart" It can be used to program processes that can be split into steps. The main components of SFC are: - Steps with associated actions - Transitions with associated logic conditions - Directed links between steps and transitions transitions must have a Boolean condition that indicates if the transition can be crossed. The condition is a Boolean expression that can be programmed in ST"Structured text" A high-level language that is block structured and syntactically resembles Pascal language.

In ST language, enter a Boolean expression. It can be a complex expression including function calls and parentheses. For example:

   bForce AND (bAlarm OR min (iLevel, 1) <> 1)

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