Low current binary input subsystem
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United States of America Patent
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Sep 30, 1997
Grant Date -
N/A
app pub date -
Mar 24, 1995
filing date -
Mar 24, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a low current binary input subsystem for providing a binary input signal to a data acquisition system. The binary input subsystem monitors the open/close state of a field contact and provides galvanic isolation of noisy field contacts, high noise immunity, a steady state current of approximately 1.2 milliamps resulting in power dissipation of approximately 0.25 watts for a 125 VDC input, and a momentary high current pulse of approximately 150 milliamps for a duration of approximately 4 milliseconds during field contact closure to aid in cleaning of oxides from the field contact.
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