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.

机抓‘制刊-实时性要求很高，将机的所有控制任务，按照任务的功能、执行率、实时性划丫分为相对独立的子程序，按照实时性要求，分时执行。