Process control languages - designer's perspective of adequacy and future requirements

摘要

A process control system designer is required to have an understanding of multiple disciplines in order to develop an appropriate design. This inc ludes knowledge of the process to be controlled, the habits of the user, and the architecture of the available control instrumentation. When a pro grammable digital computer is used, it is necessary to define models to help evaluate design tradeoffs. One such model defines a three axis matrix relating to the processes, the computer operating systems and the computer languages. A concept of levels of language matched with the operating system and the processes can then be developed. An evaluation with this model indicates that the major inadequacies of process control languages result when the system designer must default to an incorrect language to resolve interactions. The requirements of the process control clearly indicate that the computer should be adapted to the user. Most formal languages compromise these requirements significantly by forcing the user, the process and the operating system to conform to the language.