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.

发机抓‘制刊-实时要求很高，将发机的所有控制任务，按照任务的功能、执行频率、实时分为相对独立的子程序，按照实时要求，分时执行。