Serially shutting down extension units to time extend power to CPU from charging backup supply
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United States of America Patent
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Oct 22, 2013
Grant Date -
Mar 31, 2011
app pub date -
Sep 24, 2010
filing date -
Sep 25, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A programmable controller includes one or more extension units; a CPU unit for controlling the extension units; and a charging element. The CPU unit includes a voltage detection circuit for detecting an output voltage of the charging element and outputting a voltage reduction signal when the detected output voltage is lowered to a level equal to or lower than a reference value and a signal output circuit for outputting a power supply stop signal in response to the voltage reduction signal. Each extension unit includes a voltage detection circuit for detecting an output voltage of an power circuit and outputting a power supply stop signal when the detected output voltage is lowered to a level equal to or lower than a reference value and a power supply stop circuit for stopping the power circuit in response to the power supply stop signal.
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