Versatile interface means for computer-based control systems

Details Versatile interface means for computer-based control systems Versatile interface means for computer-based control systems

G - Physics

05

D

341/112, 354/235

G05D 23/19 (2006.01) F24F 11/00 (2006.01) G05B 15/00 (2006.01) G05B 15/02 (2006.01) G05B 19/042 (2006.01) G05D 23/24 (2006.01)

Patent

CA 1315888

VERSATILE INTERFACE MEANS FOR COMPUTER-BASED CONTROL SYSTEMS ABSTRACT OF THE DISCLOSURE A computer implemented control system which includes interface circuitry by which signal intelligence is taken in to the computer from external devices such as sensors and is fed out from the computer to external devices such as actuators which correctively adjust controlled parameters. An interface circuit for each of the several external devices is made "universal" in that either an analog input, bistate input, analog output, or bistate output device may be connected to any given one of the terminal points. A voltage follower amplifier sends the intelligence signal to an output device through a low-cost diode, with negative feedback taken from the downstream side of the diode. When an input device is elected for a given terminal point, simple program editing assures that the diode will be reverse biased to isolate the amplifier from the input signal path. In addition, inaccuracies in the analog output voltage fed to an output device --arising from contact resistances in a separable connector-- are drastically reduced by a dual-path separable connector arrangement which provides two independent circuit convections for the output voltage and for negative feedback.

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