1.The requirement of real time is very high, all control tasks ;ire classified into relatively independent subprogramme by executive frequency and function to time-sharing execute.

1.机抓‘制刊-实时性要求很高，机的所有控制任，任的功能、执行频率、实时性划丫分为相对独立的子程序，实时性要求，分时执行。