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A description of the implementation of Direct Digital Control systems at TAIAB (Tour & Andersson Industrial Automation AB), and a study of the problems in such work. Including a technical introduction to the TA 6500/6501, decentralized DCC-systems.

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A conventional PID-controller is used to investigate some process-models. These are going to be used later to test a self-tuner. Some problems associated to digital PID-algorithms are discussed, and such an algorithm is described and implemented in a computer. A simple way to obtain critical gain and period in a closed-loop situation is described, and used to design a self-tuning PID-controller. F

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This report treats the adjustment of the parameters of an analogous PID-controller using a search method which optimizes a loss-function. A process model is updated periodically by means of a suitable identification algorithm. The loss-function is minimized by using a search algorithm. This is done by comparing the values of the loss-function for different setting of the parameters forming a verte