Digital/frequency input for industrial control applications
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United States of America Patent
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Nov 26, 1991
Grant Date -
N/A
app pub date -
Apr 20, 1989
filing date -
Apr 20, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An input circuit for conditioning a control signal having a variety of waveforms and voltage levels, comprises a pair of input terminals having a metal oxide varistor connected thereacross. One terminal is connected to the base of a transistor thru a resistor, the emitter of the transistor driving an opto-coupler for isolating the control signal from a micro-processor which receives the control signal over an inverter having a schmitt trigger input.
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