Microcomputer Interfacing
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INTERFACING MICRCCOMPurERS FOR PROCESS CONI ROL John M Messer Eastern Illinois Universtiy To adeqmtely deal with the interfacing of microcanputers and process control, t i s necessary t o first establish a minimal level o f understandi ng o f both process control and microcomputers. INl RODu:::rION ill PROCESS CONTROL Process control usually consists of two parts, 1) a control circuit that turn on o r off the process, and 2) a feedback circuit that monitors the ·process and feedbacks a signal to inform the control circui a s to condi tions i n the process. This is usually referred to a s a closed loop control circuit. The control circuit can b e continmus or discontinmus. Continuous indicates that the control circuit never interrupts or discontines the controlled process (e.g. t o control the temperature o f an oven using a continmus control circuit heat would always be generated i n the oven by a resistive material and a variable voltage/current) . Discontinuous indicates that the control circuit interrupts or turns o n and off the process (e.g. t o control the temperature of an oven using a discontinuous control circuit the heat would be generated at maximum until a predetermined temperature i s reached, the heat generating device would be turned off o r Dr. Messer is Associate Professor at Eastern Illinois Uni versi ty , Charleston,
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Transcript of Microcomputer Interfacing
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