Chapter 14 Sequential Function Chart If the users want to create a transition, they have to unfold the sequential function chart section, selection Transitions, right-click Transitions and then click Add , type a transition name in the New Transition window, and select a programming language in the New Transition window. After the users double-click the action or the transition created in the project management area, the corresponding program editing window will appear. In the window for the transition, there is a symbol name which is the same as the transition program name. The action and the transition are edited in much the same way as a general POU is.
However, there are no local symbol tables in the window for the action and the window for the transition. If users want to declare a local symbol table, they have to declare it in the window for the sequential function chart. Besides, the actions and the transitions in a sequential function chart share the same local symbol table. *. If the transition create is assigned to a transition in the sequential function chart, the window for the transition will be opened after users double-click the transition in the sequential function chart. 14-35