ISPSoft User Manual 14.3 Create SFC in ISPSoft 14.3.1 Editing Environment Select the Sequential Function Chart (SFC) option button in the Language section in the Create Program window. Please refer to section 5.4.1 for more information about creating a sequential function chart. In addition, users have to pay attention to the following two points when they create a sequential function chart. (a) The programming language used to create a POU of the function block type can not be a sequential function chart. (b) If the programming language used to create a POU of the program type is a sequential function chart, the POU of the program type can only be assigned to a cyclic task.
The environment in which a sequential function chart can be edited is shown below. The table at the upper part of the window is a local symbol table, and the area at the lower part of the window is a working area. The working area is like a checkerboard. The steps and the transitions are put in squares. If users click an object or the square where the object is put, the object will be selected, and a yellow frame will appear. Local symbol table Working area 14-32