Industrial General Purpose Control System Using Microprocessor Based Circuit

Abstract

We don’t exaggerate if we say that digital electronics is the heart of the modern industry. It is almost indispensable for all fields of industry to have digital parts involved in their different processes. Continuous monitoring of different operations is essential for engineers to guarantee that every part of the operation goes as it is previously planned. Sophisticated feedback and control systems use digitized data to maintain the stability of the system. The evolution of microprocessors improved the power of analyzing digital data, which in turn helped the controllers give more accurate results. Early microprocessors contained few thousands of logic gates while the modern ones might contain few tens of millions of logic gates. This huge and dramatic development in the microprocessors capabilities added much to their abilities to analyze and act promptly and accurately for any system requirement. Some sensitive control applications like the automatic craft landing system and the altitude control system of the satellite require fast and accurate response of the attached control system. This can not be attained without a digital PID control system. There is a possibility of activating our system by voice using an IC Voicedirect 364 which is an IC which can recognize up to 15 phrases. It is claimed to be over 99% accurate. A talk back system (aka SCADA ) sends information back to us via DTMF. This DTMF signal can light status maps, turn on indicators or supply information to computers, printers or recorders. Through the pages of this thesis we will try to give a comprehensive overview of the engineering aspects of general-purpose systems that can perform specific control functions. Analog controllers, digital controllers, and computer interface are the areas of most interest herein. Both classical and modern techniques of analysis and design are considered in this thesis