Important Language Features

Abstract

A program for on-line control or evaluation of a technical process has to react rapidly on spontaneously received information of the process or on timely results. Out of this reason it is not sufficient to arrange and go through the various divisions of the program sequentially, that means in timely unchanged sequence. It is of importance that the more or less complex automation problem has to be divided into problem- justified components of different states of urgency and that the program structure must be fitted to this problem structure. This causes the existence of independent program elements for sub-problems ready to be solved timely sequentially among other problems (e.g. procedures). However, there also arise independent program elements for sub-problems, which based on a timely not determined cause (e.g. disturbance in the process under control) have to be solved immediately parallel to other problems.