Microcomputer process control
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"The objective of this work is to extend the functions of a MOSTEK micro-computer allowing it to function as data logging and as a digital control unit. It will be capable of accepting multiple inputs from analog sensors; of computing multiple control functions with FORTRAN programming; of using parameters that may be entered via a keyboard; of comparing the control functions with set points that may be entered via the the keyboard; and of outputting multiple control signals that may be used to activate a control device. In the work described here, the output signal would be an on-off control only. Programming will be in FORTRAN, except in very unusualcircumstances. Digital-to-Analog conversion boards are part off the MOSTEK microcomputer system so that extension to analog outputs will be possible fairly easily. The MOSTEK microcomputer is a complex piece of equiptment that is fascinating in its own respect. It is a further objective of this work to make the power of the computer available to those who do not find it fascinating. Typical chemical engineers who need data logging or control capabilites but do not want (or need) to learn anything about the microcomputer itself, should be able to satsify their needs using this paper and an assumed understanding of the FORTRAN language. Any or all of the values of the variables -- input or output -- or any function of the variables as may be computed in a FORTRAN program, may be stored on a diskette or may be printed out. To demonstrate the control system, two primitive processes were controlled: 1. Pressure control of a vacuum vessel by controlling the air bleed-in rate; 2. Temperature control of a stirred bucket of water by proportioning an inlet flow of hot water."--Introduction.
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