ISPSoft User Manual 14.2.5 Jump The use of a jump structure in a sequential function chart results in the passing of control to a step which is specified. There is at least one jump point indicating that the passing of control will occur once the transition preceding the jump point is true in a sequential function chart. Users can use jump structures quite freely. If they use a jump structure in a sequential function chart, they have to make sure that the program is not confused. The program below is a sequential function chart where there is a divergence of sequence selection. If Tran2 is true, control will be passed to STEP2. When Tran4 is true, it passes control to STEP1 through a jump.
When Tran5 is true, it passes control to STEP0. If users use a jump structure in a sequential function chart, the step specified must be a step in the same sequential function chart. If the step specified is not in the same sequential function chart, and is declared in a local symbol table or the global symbol table, an error occurs when the program is compiled If control needs to be passed from a step in a sequential function chart to a step in another sequential function, users can make use of the characteristics of steps and the characteristics of transitions. Users can declare the step or the transition which is the destination of a jump in the global symbol table.
When the condition of the jump is met, the step or the transition declared is set to ON. The condition of the jump can be created in an action. 14-12