Abstract
It is reported about the development and practical use of a versatile high-level process control language, based on the macroassembler for the Intel 8080A and 8085 processors, working under the CP/M operating system. Specific circumstances and motives are discussed which led to this development. Some details of the language, called PREM, are illustrated by means of a short sample program and by indicating the procedure for program preparation and debugging. Next, a few applications of the language are shown briefly, including real-time laboratory experimentation with various discrete control algorithms, on-line data acquisition and advanced control experiments, both on two industrial plants: a hot-water boiler in a district-heating plant and a recovery boiler in a pulp and paper factory. Following the considerations and experience given in the paper, it is concluded that the approach presented may be, in some circumstances and despite its minor drawbacks, a cost-effective solution for the realization of smaller process control projects.
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