Research of sequence diagram drawing method in intermittent control system

For the sequence diagram drawing in the intermittent control system software designing, gives analysis and evaluation for all existing sequence diagram drawing methods. On the base of existing state diagram, puts forward a kind of improved state diagram. The improved state diagram is simple and easy to use, very convenient in conversion to program language, and has strong checking function for process analysis of the intermittent control system. It can also deal with both switch signal and analog signal, and concurrent event too. Finally gives an application example to improve that improved state diagram is simple and effective.