Interrupt exception window protocol on a data communication bus and methods and apparatuses for using same
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United States of America Patent
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Jun 23, 2020
Grant Date -
Aug 1, 2019
app pub date -
Jan 31, 2019
filing date -
Nov 30, 2015
priority date (Note) -
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Abstract
An input/output (I/O) and control system for long distance communications and industrial applications having a bus and protocol for communications between field devices and a channel generator for monitoring and control of the field devices. The channel generator produces a pulse train such as an offset square wave with dual scan bus cycles having alternating A and B scan cycles that each comprise a plurality of channel windows assigned to the field devices. One or more channel windows in the A and B scan cycles has an exception interrupt window during which the control unit can detect a low level signal provided by a field device before its corresponding channel window in the dual scan bus cycle, thereby reducing system reaction time.
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