PROSAD. Um sistema de aquisição de dados e controle de processos a microprocessador.

Abstract

The appearance of microprocessors brought about changes relevant to process control techniques. Due to their low cost and small dimensions, computerized control, previously restricted to the most expensive and sophisticated applications, can be used in almost all levels of complexity. This work presents the hardware and software of the PROSAD, a data acquisition and process control system configured in stand alone mode. Such a system is based on Motorola MC 6800 microprocessor. Its hardware has been designed in order to give it a relative flexibility allowing it to be used in several different types of application: industrial processes of one or several loops, data acquisition in general, numerical control, laboratory automation and etc. The system has a track interface that allows the use of several I / O interfaces. The system software consists of a macro assembler and a time management kernel real. The macro assembler has 16 instructions that represent some of the operations of the microprocessor. 0 management core has an executive and a static task scheduler.