Microcomputer Based Real-Time Control

The paper discusses some aspects of real-time control with microcomputers and commerc-ially available computer-process interface hardware and accompanying software. A library of Turbo Pascal CALLable routines written to control the DT 2801 I/O board is described. In order to achieve on a microcomputer a real-time multitasking environment, MS DOS was combined with an inexpensive real-time executive. Development of a multivariable process control is discussed. Complete Turbo Pascal programs performing controlling and alarm generating functions are presented.